![Namhyung Kim](/assets/img/avatar_default.png)
The perf kmem command records and analyze kernel memory allocation only
for SLAB objects. This patch implement a simple page allocator analyzer
using kmem:mm_page_alloc and kmem:mm_page_free events.
It adds two new options of --slab and --page. The --slab option is for
analyzing SLAB allocator and that's what perf kmem currently does.
The new --page option enables page allocator events and analyze kernel
memory usage in page unit. Currently, 'stat --alloc' subcommand is
implemented only.
If none of these --slab nor --page is specified, --slab is implied.
First run 'perf kmem record' to generate a suitable perf.data file:
# perf kmem record --page sleep 5
Then run 'perf kmem stat' to postprocess the perf.data file:
# perf kmem stat --page --alloc --line 10
-------------------------------------------------------------------------------
PFN | Total alloc (KB) | Hits | Order | Mig.type | GFP flags
-------------------------------------------------------------------------------
4045014 | 16 | 1 | 2 | RECLAIM | 00285250
4143980 | 16 | 1 | 2 | RECLAIM | 00285250
3938658 | 16 | 1 | 2 | RECLAIM | 00285250
4045400 | 16 | 1 | 2 | RECLAIM | 00285250
3568708 | 16 | 1 | 2 | RECLAIM | 00285250
3729824 | 16 | 1 | 2 | RECLAIM | 00285250
3657210 | 16 | 1 | 2 | RECLAIM | 00285250
4120750
| 16 | 1 | 2 | RECLAIM | 00285250
3678850 | 16 | 1 | 2 | RECLAIM | 00285250
3693874 | 16 | 1 | 2 | RECLAIM | 00285250
... | ... | ... | ... | ... | ...
-------------------------------------------------------------------------------
SUMMARY (page allocator)
========================
Total allocation requests : 44,260 [ 177,256 KB ]
Total free requests : 117 [ 468 KB ]
Total alloc+freed requests : 49 [ 196 KB ]
Total alloc-only requests : 44,211 [ 177,060 KB ]
Total free-only requests : 68 [ 272 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 32 . 44,210 . .
1 . . . . .
2 . 18 . . .
3 . . . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . . . .
10 . . . . .
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1428298576-9785-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1200 lines
28 KiB
C
1200 lines
28 KiB
C
#include "builtin.h"
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#include "perf.h"
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#include "util/evlist.h"
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#include "util/evsel.h"
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#include "util/util.h"
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#include "util/cache.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/header.h"
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#include "util/session.h"
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#include "util/tool.h"
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#include "util/parse-options.h"
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#include "util/trace-event.h"
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#include "util/data.h"
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#include "util/cpumap.h"
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#include "util/debug.h"
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#include <linux/rbtree.h>
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#include <linux/string.h>
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#include <locale.h>
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static int kmem_slab;
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static int kmem_page;
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static long kmem_page_size;
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struct alloc_stat;
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typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
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static int alloc_flag;
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static int caller_flag;
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static int alloc_lines = -1;
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static int caller_lines = -1;
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static bool raw_ip;
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struct alloc_stat {
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u64 call_site;
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u64 ptr;
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u64 bytes_req;
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u64 bytes_alloc;
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u32 hit;
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u32 pingpong;
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short alloc_cpu;
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struct rb_node node;
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};
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static struct rb_root root_alloc_stat;
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static struct rb_root root_alloc_sorted;
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static struct rb_root root_caller_stat;
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static struct rb_root root_caller_sorted;
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static unsigned long total_requested, total_allocated;
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static unsigned long nr_allocs, nr_cross_allocs;
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static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
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int bytes_req, int bytes_alloc, int cpu)
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{
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struct rb_node **node = &root_alloc_stat.rb_node;
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struct rb_node *parent = NULL;
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struct alloc_stat *data = NULL;
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while (*node) {
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parent = *node;
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data = rb_entry(*node, struct alloc_stat, node);
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if (ptr > data->ptr)
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node = &(*node)->rb_right;
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else if (ptr < data->ptr)
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node = &(*node)->rb_left;
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else
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break;
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}
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if (data && data->ptr == ptr) {
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data->hit++;
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data->bytes_req += bytes_req;
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data->bytes_alloc += bytes_alloc;
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} else {
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data = malloc(sizeof(*data));
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if (!data) {
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pr_err("%s: malloc failed\n", __func__);
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return -1;
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}
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data->ptr = ptr;
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data->pingpong = 0;
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data->hit = 1;
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data->bytes_req = bytes_req;
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data->bytes_alloc = bytes_alloc;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &root_alloc_stat);
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}
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data->call_site = call_site;
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data->alloc_cpu = cpu;
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return 0;
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}
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static int insert_caller_stat(unsigned long call_site,
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int bytes_req, int bytes_alloc)
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{
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struct rb_node **node = &root_caller_stat.rb_node;
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struct rb_node *parent = NULL;
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struct alloc_stat *data = NULL;
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while (*node) {
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parent = *node;
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data = rb_entry(*node, struct alloc_stat, node);
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if (call_site > data->call_site)
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node = &(*node)->rb_right;
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else if (call_site < data->call_site)
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node = &(*node)->rb_left;
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else
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break;
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}
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if (data && data->call_site == call_site) {
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data->hit++;
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data->bytes_req += bytes_req;
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data->bytes_alloc += bytes_alloc;
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} else {
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data = malloc(sizeof(*data));
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if (!data) {
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pr_err("%s: malloc failed\n", __func__);
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return -1;
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}
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data->call_site = call_site;
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data->pingpong = 0;
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data->hit = 1;
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data->bytes_req = bytes_req;
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data->bytes_alloc = bytes_alloc;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &root_caller_stat);
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}
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return 0;
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}
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static int perf_evsel__process_alloc_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr"),
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call_site = perf_evsel__intval(evsel, sample, "call_site");
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int bytes_req = perf_evsel__intval(evsel, sample, "bytes_req"),
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bytes_alloc = perf_evsel__intval(evsel, sample, "bytes_alloc");
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if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) ||
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insert_caller_stat(call_site, bytes_req, bytes_alloc))
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return -1;
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total_requested += bytes_req;
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total_allocated += bytes_alloc;
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nr_allocs++;
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return 0;
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}
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static int perf_evsel__process_alloc_node_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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int ret = perf_evsel__process_alloc_event(evsel, sample);
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if (!ret) {
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int node1 = cpu__get_node(sample->cpu),
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node2 = perf_evsel__intval(evsel, sample, "node");
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if (node1 != node2)
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nr_cross_allocs++;
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}
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return ret;
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}
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static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);
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static int callsite_cmp(struct alloc_stat *, struct alloc_stat *);
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static struct alloc_stat *search_alloc_stat(unsigned long ptr,
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unsigned long call_site,
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struct rb_root *root,
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sort_fn_t sort_fn)
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{
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struct rb_node *node = root->rb_node;
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struct alloc_stat key = { .ptr = ptr, .call_site = call_site };
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while (node) {
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struct alloc_stat *data;
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int cmp;
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data = rb_entry(node, struct alloc_stat, node);
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cmp = sort_fn(&key, data);
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if (cmp < 0)
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node = node->rb_left;
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else if (cmp > 0)
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node = node->rb_right;
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else
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return data;
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}
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return NULL;
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}
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static int perf_evsel__process_free_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr");
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struct alloc_stat *s_alloc, *s_caller;
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s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
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if (!s_alloc)
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return 0;
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if ((short)sample->cpu != s_alloc->alloc_cpu) {
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s_alloc->pingpong++;
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s_caller = search_alloc_stat(0, s_alloc->call_site,
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&root_caller_stat, callsite_cmp);
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if (!s_caller)
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return -1;
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s_caller->pingpong++;
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}
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s_alloc->alloc_cpu = -1;
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return 0;
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}
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static u64 total_page_alloc_bytes;
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static u64 total_page_free_bytes;
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static u64 total_page_nomatch_bytes;
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static u64 total_page_fail_bytes;
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static unsigned long nr_page_allocs;
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static unsigned long nr_page_frees;
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static unsigned long nr_page_fails;
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static unsigned long nr_page_nomatch;
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static bool use_pfn;
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#define MAX_MIGRATE_TYPES 6
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#define MAX_PAGE_ORDER 11
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static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES];
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struct page_stat {
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struct rb_node node;
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u64 page;
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int order;
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unsigned gfp_flags;
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unsigned migrate_type;
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u64 alloc_bytes;
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u64 free_bytes;
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int nr_alloc;
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int nr_free;
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};
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static struct rb_root page_tree;
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static struct rb_root page_alloc_tree;
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static struct rb_root page_alloc_sorted;
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static struct page_stat *search_page(unsigned long page, bool create)
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{
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struct rb_node **node = &page_tree.rb_node;
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struct rb_node *parent = NULL;
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struct page_stat *data;
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while (*node) {
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s64 cmp;
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parent = *node;
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data = rb_entry(*node, struct page_stat, node);
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cmp = data->page - page;
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if (cmp < 0)
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node = &parent->rb_left;
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else if (cmp > 0)
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node = &parent->rb_right;
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else
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return data;
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}
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if (!create)
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return NULL;
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data = zalloc(sizeof(*data));
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if (data != NULL) {
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data->page = page;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &page_tree);
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}
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return data;
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}
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static int page_stat_cmp(struct page_stat *a, struct page_stat *b)
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{
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if (a->page > b->page)
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return -1;
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if (a->page < b->page)
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return 1;
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if (a->order > b->order)
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return -1;
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if (a->order < b->order)
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return 1;
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if (a->migrate_type > b->migrate_type)
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return -1;
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if (a->migrate_type < b->migrate_type)
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return 1;
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if (a->gfp_flags > b->gfp_flags)
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return -1;
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if (a->gfp_flags < b->gfp_flags)
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return 1;
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return 0;
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}
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static struct page_stat *search_page_alloc_stat(struct page_stat *stat, bool create)
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{
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struct rb_node **node = &page_alloc_tree.rb_node;
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struct rb_node *parent = NULL;
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struct page_stat *data;
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while (*node) {
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s64 cmp;
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parent = *node;
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data = rb_entry(*node, struct page_stat, node);
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cmp = page_stat_cmp(data, stat);
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if (cmp < 0)
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node = &parent->rb_left;
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else if (cmp > 0)
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node = &parent->rb_right;
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else
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return data;
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}
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if (!create)
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return NULL;
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data = zalloc(sizeof(*data));
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if (data != NULL) {
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data->page = stat->page;
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data->order = stat->order;
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data->gfp_flags = stat->gfp_flags;
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data->migrate_type = stat->migrate_type;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &page_alloc_tree);
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}
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return data;
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}
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static bool valid_page(u64 pfn_or_page)
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{
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if (use_pfn && pfn_or_page == -1UL)
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return false;
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if (!use_pfn && pfn_or_page == 0)
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return false;
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return true;
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}
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static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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u64 page;
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unsigned int order = perf_evsel__intval(evsel, sample, "order");
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unsigned int gfp_flags = perf_evsel__intval(evsel, sample, "gfp_flags");
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unsigned int migrate_type = perf_evsel__intval(evsel, sample,
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"migratetype");
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u64 bytes = kmem_page_size << order;
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struct page_stat *stat;
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struct page_stat this = {
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.order = order,
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.gfp_flags = gfp_flags,
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.migrate_type = migrate_type,
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};
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if (use_pfn)
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page = perf_evsel__intval(evsel, sample, "pfn");
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else
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page = perf_evsel__intval(evsel, sample, "page");
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nr_page_allocs++;
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total_page_alloc_bytes += bytes;
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if (!valid_page(page)) {
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nr_page_fails++;
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total_page_fail_bytes += bytes;
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return 0;
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}
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/*
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* This is to find the current page (with correct gfp flags and
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* migrate type) at free event.
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*/
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stat = search_page(page, true);
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if (stat == NULL)
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return -ENOMEM;
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stat->order = order;
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stat->gfp_flags = gfp_flags;
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stat->migrate_type = migrate_type;
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this.page = page;
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stat = search_page_alloc_stat(&this, true);
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if (stat == NULL)
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return -ENOMEM;
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stat->nr_alloc++;
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stat->alloc_bytes += bytes;
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order_stats[order][migrate_type]++;
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return 0;
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}
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static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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u64 page;
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unsigned int order = perf_evsel__intval(evsel, sample, "order");
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u64 bytes = kmem_page_size << order;
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struct page_stat *stat;
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struct page_stat this = {
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.order = order,
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};
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if (use_pfn)
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page = perf_evsel__intval(evsel, sample, "pfn");
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else
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page = perf_evsel__intval(evsel, sample, "page");
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nr_page_frees++;
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total_page_free_bytes += bytes;
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stat = search_page(page, false);
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if (stat == NULL) {
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pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
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page, order);
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nr_page_nomatch++;
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total_page_nomatch_bytes += bytes;
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return 0;
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}
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this.page = page;
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this.gfp_flags = stat->gfp_flags;
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this.migrate_type = stat->migrate_type;
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rb_erase(&stat->node, &page_tree);
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free(stat);
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stat = search_page_alloc_stat(&this, false);
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if (stat == NULL)
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return -ENOENT;
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stat->nr_free++;
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stat->free_bytes += bytes;
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return 0;
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}
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typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
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struct perf_sample *sample);
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static int process_sample_event(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel,
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struct machine *machine)
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{
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struct thread *thread = machine__findnew_thread(machine, sample->pid,
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sample->tid);
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if (thread == NULL) {
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pr_debug("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
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if (evsel->handler != NULL) {
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tracepoint_handler f = evsel->handler;
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return f(evsel, sample);
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}
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return 0;
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}
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static struct perf_tool perf_kmem = {
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.sample = process_sample_event,
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.comm = perf_event__process_comm,
|
|
.mmap = perf_event__process_mmap,
|
|
.mmap2 = perf_event__process_mmap2,
|
|
.ordered_events = true,
|
|
};
|
|
|
|
static double fragmentation(unsigned long n_req, unsigned long n_alloc)
|
|
{
|
|
if (n_alloc == 0)
|
|
return 0.0;
|
|
else
|
|
return 100.0 - (100.0 * n_req / n_alloc);
|
|
}
|
|
|
|
static void __print_slab_result(struct rb_root *root,
|
|
struct perf_session *session,
|
|
int n_lines, int is_caller)
|
|
{
|
|
struct rb_node *next;
|
|
struct machine *machine = &session->machines.host;
|
|
|
|
printf("%.105s\n", graph_dotted_line);
|
|
printf(" %-34s |", is_caller ? "Callsite": "Alloc Ptr");
|
|
printf(" Total_alloc/Per | Total_req/Per | Hit | Ping-pong | Frag\n");
|
|
printf("%.105s\n", graph_dotted_line);
|
|
|
|
next = rb_first(root);
|
|
|
|
while (next && n_lines--) {
|
|
struct alloc_stat *data = rb_entry(next, struct alloc_stat,
|
|
node);
|
|
struct symbol *sym = NULL;
|
|
struct map *map;
|
|
char buf[BUFSIZ];
|
|
u64 addr;
|
|
|
|
if (is_caller) {
|
|
addr = data->call_site;
|
|
if (!raw_ip)
|
|
sym = machine__find_kernel_function(machine, addr, &map, NULL);
|
|
} else
|
|
addr = data->ptr;
|
|
|
|
if (sym != NULL)
|
|
snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name,
|
|
addr - map->unmap_ip(map, sym->start));
|
|
else
|
|
snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr);
|
|
printf(" %-34s |", buf);
|
|
|
|
printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n",
|
|
(unsigned long long)data->bytes_alloc,
|
|
(unsigned long)data->bytes_alloc / data->hit,
|
|
(unsigned long long)data->bytes_req,
|
|
(unsigned long)data->bytes_req / data->hit,
|
|
(unsigned long)data->hit,
|
|
(unsigned long)data->pingpong,
|
|
fragmentation(data->bytes_req, data->bytes_alloc));
|
|
|
|
next = rb_next(next);
|
|
}
|
|
|
|
if (n_lines == -1)
|
|
printf(" ... | ... | ... | ... | ... | ... \n");
|
|
|
|
printf("%.105s\n", graph_dotted_line);
|
|
}
|
|
|
|
static const char * const migrate_type_str[] = {
|
|
"UNMOVABL",
|
|
"RECLAIM",
|
|
"MOVABLE",
|
|
"RESERVED",
|
|
"CMA/ISLT",
|
|
"UNKNOWN",
|
|
};
|
|
|
|
static void __print_page_result(struct rb_root *root,
|
|
struct perf_session *session __maybe_unused,
|
|
int n_lines)
|
|
{
|
|
struct rb_node *next = rb_first(root);
|
|
const char *format;
|
|
|
|
printf("\n%.80s\n", graph_dotted_line);
|
|
printf(" %-16s | Total alloc (KB) | Hits | Order | Mig.type | GFP flags\n",
|
|
use_pfn ? "PFN" : "Page");
|
|
printf("%.80s\n", graph_dotted_line);
|
|
|
|
if (use_pfn)
|
|
format = " %16llu | %'16llu | %'9d | %5d | %8s | %08lx\n";
|
|
else
|
|
format = " %016llx | %'16llu | %'9d | %5d | %8s | %08lx\n";
|
|
|
|
while (next && n_lines--) {
|
|
struct page_stat *data;
|
|
|
|
data = rb_entry(next, struct page_stat, node);
|
|
|
|
printf(format, (unsigned long long)data->page,
|
|
(unsigned long long)data->alloc_bytes / 1024,
|
|
data->nr_alloc, data->order,
|
|
migrate_type_str[data->migrate_type],
|
|
(unsigned long)data->gfp_flags);
|
|
|
|
next = rb_next(next);
|
|
}
|
|
|
|
if (n_lines == -1)
|
|
printf(" ... | ... | ... | ... | ... | ... \n");
|
|
|
|
printf("%.80s\n", graph_dotted_line);
|
|
}
|
|
|
|
static void print_slab_summary(void)
|
|
{
|
|
printf("\nSUMMARY (SLAB allocator)");
|
|
printf("\n========================\n");
|
|
printf("Total bytes requested: %'lu\n", total_requested);
|
|
printf("Total bytes allocated: %'lu\n", total_allocated);
|
|
printf("Total bytes wasted on internal fragmentation: %'lu\n",
|
|
total_allocated - total_requested);
|
|
printf("Internal fragmentation: %f%%\n",
|
|
fragmentation(total_requested, total_allocated));
|
|
printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs);
|
|
}
|
|
|
|
static void print_page_summary(void)
|
|
{
|
|
int o, m;
|
|
u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch;
|
|
u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes;
|
|
|
|
printf("\nSUMMARY (page allocator)");
|
|
printf("\n========================\n");
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation requests",
|
|
nr_page_allocs, total_page_alloc_bytes / 1024);
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free requests",
|
|
nr_page_frees, total_page_free_bytes / 1024);
|
|
printf("\n");
|
|
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests",
|
|
nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total alloc-only requests",
|
|
nr_page_allocs - nr_alloc_freed,
|
|
(total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free-only requests",
|
|
nr_page_nomatch, total_page_nomatch_bytes / 1024);
|
|
printf("\n");
|
|
|
|
printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation failures",
|
|
nr_page_fails, total_page_fail_bytes / 1024);
|
|
printf("\n");
|
|
|
|
printf("%5s %12s %12s %12s %12s %12s\n", "Order", "Unmovable",
|
|
"Reclaimable", "Movable", "Reserved", "CMA/Isolated");
|
|
printf("%.5s %.12s %.12s %.12s %.12s %.12s\n", graph_dotted_line,
|
|
graph_dotted_line, graph_dotted_line, graph_dotted_line,
|
|
graph_dotted_line, graph_dotted_line);
|
|
|
|
for (o = 0; o < MAX_PAGE_ORDER; o++) {
|
|
printf("%5d", o);
|
|
for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) {
|
|
if (order_stats[o][m])
|
|
printf(" %'12d", order_stats[o][m]);
|
|
else
|
|
printf(" %12c", '.');
|
|
}
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
static void print_slab_result(struct perf_session *session)
|
|
{
|
|
if (caller_flag)
|
|
__print_slab_result(&root_caller_sorted, session, caller_lines, 1);
|
|
if (alloc_flag)
|
|
__print_slab_result(&root_alloc_sorted, session, alloc_lines, 0);
|
|
print_slab_summary();
|
|
}
|
|
|
|
static void print_page_result(struct perf_session *session)
|
|
{
|
|
if (alloc_flag)
|
|
__print_page_result(&page_alloc_sorted, session, alloc_lines);
|
|
print_page_summary();
|
|
}
|
|
|
|
static void print_result(struct perf_session *session)
|
|
{
|
|
if (kmem_slab)
|
|
print_slab_result(session);
|
|
if (kmem_page)
|
|
print_page_result(session);
|
|
}
|
|
|
|
struct sort_dimension {
|
|
const char name[20];
|
|
sort_fn_t cmp;
|
|
struct list_head list;
|
|
};
|
|
|
|
static LIST_HEAD(caller_sort);
|
|
static LIST_HEAD(alloc_sort);
|
|
|
|
static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data,
|
|
struct list_head *sort_list)
|
|
{
|
|
struct rb_node **new = &(root->rb_node);
|
|
struct rb_node *parent = NULL;
|
|
struct sort_dimension *sort;
|
|
|
|
while (*new) {
|
|
struct alloc_stat *this;
|
|
int cmp = 0;
|
|
|
|
this = rb_entry(*new, struct alloc_stat, node);
|
|
parent = *new;
|
|
|
|
list_for_each_entry(sort, sort_list, list) {
|
|
cmp = sort->cmp(data, this);
|
|
if (cmp)
|
|
break;
|
|
}
|
|
|
|
if (cmp > 0)
|
|
new = &((*new)->rb_left);
|
|
else
|
|
new = &((*new)->rb_right);
|
|
}
|
|
|
|
rb_link_node(&data->node, parent, new);
|
|
rb_insert_color(&data->node, root);
|
|
}
|
|
|
|
static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted,
|
|
struct list_head *sort_list)
|
|
{
|
|
struct rb_node *node;
|
|
struct alloc_stat *data;
|
|
|
|
for (;;) {
|
|
node = rb_first(root);
|
|
if (!node)
|
|
break;
|
|
|
|
rb_erase(node, root);
|
|
data = rb_entry(node, struct alloc_stat, node);
|
|
sort_slab_insert(root_sorted, data, sort_list);
|
|
}
|
|
}
|
|
|
|
static void sort_page_insert(struct rb_root *root, struct page_stat *data)
|
|
{
|
|
struct rb_node **new = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
|
|
while (*new) {
|
|
struct page_stat *this;
|
|
int cmp = 0;
|
|
|
|
this = rb_entry(*new, struct page_stat, node);
|
|
parent = *new;
|
|
|
|
/* TODO: support more sort key */
|
|
cmp = data->alloc_bytes - this->alloc_bytes;
|
|
|
|
if (cmp > 0)
|
|
new = &parent->rb_left;
|
|
else
|
|
new = &parent->rb_right;
|
|
}
|
|
|
|
rb_link_node(&data->node, parent, new);
|
|
rb_insert_color(&data->node, root);
|
|
}
|
|
|
|
static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted)
|
|
{
|
|
struct rb_node *node;
|
|
struct page_stat *data;
|
|
|
|
for (;;) {
|
|
node = rb_first(root);
|
|
if (!node)
|
|
break;
|
|
|
|
rb_erase(node, root);
|
|
data = rb_entry(node, struct page_stat, node);
|
|
sort_page_insert(root_sorted, data);
|
|
}
|
|
}
|
|
|
|
static void sort_result(void)
|
|
{
|
|
if (kmem_slab) {
|
|
__sort_slab_result(&root_alloc_stat, &root_alloc_sorted,
|
|
&alloc_sort);
|
|
__sort_slab_result(&root_caller_stat, &root_caller_sorted,
|
|
&caller_sort);
|
|
}
|
|
if (kmem_page) {
|
|
__sort_page_result(&page_alloc_tree, &page_alloc_sorted);
|
|
}
|
|
}
|
|
|
|
static int __cmd_kmem(struct perf_session *session)
|
|
{
|
|
int err = -EINVAL;
|
|
struct perf_evsel *evsel;
|
|
const struct perf_evsel_str_handler kmem_tracepoints[] = {
|
|
/* slab allocator */
|
|
{ "kmem:kmalloc", perf_evsel__process_alloc_event, },
|
|
{ "kmem:kmem_cache_alloc", perf_evsel__process_alloc_event, },
|
|
{ "kmem:kmalloc_node", perf_evsel__process_alloc_node_event, },
|
|
{ "kmem:kmem_cache_alloc_node", perf_evsel__process_alloc_node_event, },
|
|
{ "kmem:kfree", perf_evsel__process_free_event, },
|
|
{ "kmem:kmem_cache_free", perf_evsel__process_free_event, },
|
|
/* page allocator */
|
|
{ "kmem:mm_page_alloc", perf_evsel__process_page_alloc_event, },
|
|
{ "kmem:mm_page_free", perf_evsel__process_page_free_event, },
|
|
};
|
|
|
|
if (!perf_session__has_traces(session, "kmem record"))
|
|
goto out;
|
|
|
|
if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) {
|
|
pr_err("Initializing perf session tracepoint handlers failed\n");
|
|
goto out;
|
|
}
|
|
|
|
evlist__for_each(session->evlist, evsel) {
|
|
if (!strcmp(perf_evsel__name(evsel), "kmem:mm_page_alloc") &&
|
|
perf_evsel__field(evsel, "pfn")) {
|
|
use_pfn = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
setup_pager();
|
|
err = perf_session__process_events(session);
|
|
if (err != 0) {
|
|
pr_err("error during process events: %d\n", err);
|
|
goto out;
|
|
}
|
|
sort_result();
|
|
print_result(session);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ptr_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
if (l->ptr < r->ptr)
|
|
return -1;
|
|
else if (l->ptr > r->ptr)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension ptr_sort_dimension = {
|
|
.name = "ptr",
|
|
.cmp = ptr_cmp,
|
|
};
|
|
|
|
static int callsite_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
if (l->call_site < r->call_site)
|
|
return -1;
|
|
else if (l->call_site > r->call_site)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension callsite_sort_dimension = {
|
|
.name = "callsite",
|
|
.cmp = callsite_cmp,
|
|
};
|
|
|
|
static int hit_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
if (l->hit < r->hit)
|
|
return -1;
|
|
else if (l->hit > r->hit)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension hit_sort_dimension = {
|
|
.name = "hit",
|
|
.cmp = hit_cmp,
|
|
};
|
|
|
|
static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
if (l->bytes_alloc < r->bytes_alloc)
|
|
return -1;
|
|
else if (l->bytes_alloc > r->bytes_alloc)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension bytes_sort_dimension = {
|
|
.name = "bytes",
|
|
.cmp = bytes_cmp,
|
|
};
|
|
|
|
static int frag_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
double x, y;
|
|
|
|
x = fragmentation(l->bytes_req, l->bytes_alloc);
|
|
y = fragmentation(r->bytes_req, r->bytes_alloc);
|
|
|
|
if (x < y)
|
|
return -1;
|
|
else if (x > y)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension frag_sort_dimension = {
|
|
.name = "frag",
|
|
.cmp = frag_cmp,
|
|
};
|
|
|
|
static int pingpong_cmp(struct alloc_stat *l, struct alloc_stat *r)
|
|
{
|
|
if (l->pingpong < r->pingpong)
|
|
return -1;
|
|
else if (l->pingpong > r->pingpong)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static struct sort_dimension pingpong_sort_dimension = {
|
|
.name = "pingpong",
|
|
.cmp = pingpong_cmp,
|
|
};
|
|
|
|
static struct sort_dimension *avail_sorts[] = {
|
|
&ptr_sort_dimension,
|
|
&callsite_sort_dimension,
|
|
&hit_sort_dimension,
|
|
&bytes_sort_dimension,
|
|
&frag_sort_dimension,
|
|
&pingpong_sort_dimension,
|
|
};
|
|
|
|
#define NUM_AVAIL_SORTS ((int)ARRAY_SIZE(avail_sorts))
|
|
|
|
static int sort_dimension__add(const char *tok, struct list_head *list)
|
|
{
|
|
struct sort_dimension *sort;
|
|
int i;
|
|
|
|
for (i = 0; i < NUM_AVAIL_SORTS; i++) {
|
|
if (!strcmp(avail_sorts[i]->name, tok)) {
|
|
sort = memdup(avail_sorts[i], sizeof(*avail_sorts[i]));
|
|
if (!sort) {
|
|
pr_err("%s: memdup failed\n", __func__);
|
|
return -1;
|
|
}
|
|
list_add_tail(&sort->list, list);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int setup_sorting(struct list_head *sort_list, const char *arg)
|
|
{
|
|
char *tok;
|
|
char *str = strdup(arg);
|
|
char *pos = str;
|
|
|
|
if (!str) {
|
|
pr_err("%s: strdup failed\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
while (true) {
|
|
tok = strsep(&pos, ",");
|
|
if (!tok)
|
|
break;
|
|
if (sort_dimension__add(tok, sort_list) < 0) {
|
|
error("Unknown --sort key: '%s'", tok);
|
|
free(str);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
free(str);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_sort_opt(const struct option *opt __maybe_unused,
|
|
const char *arg, int unset __maybe_unused)
|
|
{
|
|
if (!arg)
|
|
return -1;
|
|
|
|
if (caller_flag > alloc_flag)
|
|
return setup_sorting(&caller_sort, arg);
|
|
else
|
|
return setup_sorting(&alloc_sort, arg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_caller_opt(const struct option *opt __maybe_unused,
|
|
const char *arg __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
caller_flag = (alloc_flag + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_alloc_opt(const struct option *opt __maybe_unused,
|
|
const char *arg __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
alloc_flag = (caller_flag + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_slab_opt(const struct option *opt __maybe_unused,
|
|
const char *arg __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
kmem_slab = (kmem_page + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_page_opt(const struct option *opt __maybe_unused,
|
|
const char *arg __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
kmem_page = (kmem_slab + 1);
|
|
return 0;
|
|
}
|
|
|
|
static int parse_line_opt(const struct option *opt __maybe_unused,
|
|
const char *arg, int unset __maybe_unused)
|
|
{
|
|
int lines;
|
|
|
|
if (!arg)
|
|
return -1;
|
|
|
|
lines = strtoul(arg, NULL, 10);
|
|
|
|
if (caller_flag > alloc_flag)
|
|
caller_lines = lines;
|
|
else
|
|
alloc_lines = lines;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __cmd_record(int argc, const char **argv)
|
|
{
|
|
const char * const record_args[] = {
|
|
"record", "-a", "-R", "-c", "1",
|
|
};
|
|
const char * const slab_events[] = {
|
|
"-e", "kmem:kmalloc",
|
|
"-e", "kmem:kmalloc_node",
|
|
"-e", "kmem:kfree",
|
|
"-e", "kmem:kmem_cache_alloc",
|
|
"-e", "kmem:kmem_cache_alloc_node",
|
|
"-e", "kmem:kmem_cache_free",
|
|
};
|
|
const char * const page_events[] = {
|
|
"-e", "kmem:mm_page_alloc",
|
|
"-e", "kmem:mm_page_free",
|
|
};
|
|
unsigned int rec_argc, i, j;
|
|
const char **rec_argv;
|
|
|
|
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
|
|
if (kmem_slab)
|
|
rec_argc += ARRAY_SIZE(slab_events);
|
|
if (kmem_page)
|
|
rec_argc += ARRAY_SIZE(page_events);
|
|
|
|
rec_argv = calloc(rec_argc + 1, sizeof(char *));
|
|
|
|
if (rec_argv == NULL)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(record_args); i++)
|
|
rec_argv[i] = strdup(record_args[i]);
|
|
|
|
if (kmem_slab) {
|
|
for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++)
|
|
rec_argv[i] = strdup(slab_events[j]);
|
|
}
|
|
if (kmem_page) {
|
|
for (j = 0; j < ARRAY_SIZE(page_events); j++, i++)
|
|
rec_argv[i] = strdup(page_events[j]);
|
|
}
|
|
|
|
for (j = 1; j < (unsigned int)argc; j++, i++)
|
|
rec_argv[i] = argv[j];
|
|
|
|
return cmd_record(i, rec_argv, NULL);
|
|
}
|
|
|
|
int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
|
|
{
|
|
const char * const default_sort_order = "frag,hit,bytes";
|
|
struct perf_data_file file = {
|
|
.mode = PERF_DATA_MODE_READ,
|
|
};
|
|
const struct option kmem_options[] = {
|
|
OPT_STRING('i', "input", &input_name, "file", "input file name"),
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose (show symbol address, etc)"),
|
|
OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
|
|
"show per-callsite statistics", parse_caller_opt),
|
|
OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,
|
|
"show per-allocation statistics", parse_alloc_opt),
|
|
OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
|
|
"sort by keys: ptr, call_site, bytes, hit, pingpong, frag",
|
|
parse_sort_opt),
|
|
OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt),
|
|
OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
|
|
OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
|
|
OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator",
|
|
parse_slab_opt),
|
|
OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
|
|
parse_page_opt),
|
|
OPT_END()
|
|
};
|
|
const char *const kmem_subcommands[] = { "record", "stat", NULL };
|
|
const char *kmem_usage[] = {
|
|
NULL,
|
|
NULL
|
|
};
|
|
struct perf_session *session;
|
|
int ret = -1;
|
|
|
|
argc = parse_options_subcommand(argc, argv, kmem_options,
|
|
kmem_subcommands, kmem_usage, 0);
|
|
|
|
if (!argc)
|
|
usage_with_options(kmem_usage, kmem_options);
|
|
|
|
if (kmem_slab == 0 && kmem_page == 0)
|
|
kmem_slab = 1; /* for backward compatibility */
|
|
|
|
if (!strncmp(argv[0], "rec", 3)) {
|
|
symbol__init(NULL);
|
|
return __cmd_record(argc, argv);
|
|
}
|
|
|
|
file.path = input_name;
|
|
|
|
session = perf_session__new(&file, false, &perf_kmem);
|
|
if (session == NULL)
|
|
return -1;
|
|
|
|
if (kmem_page) {
|
|
struct perf_evsel *evsel = perf_evlist__first(session->evlist);
|
|
|
|
if (evsel == NULL || evsel->tp_format == NULL) {
|
|
pr_err("invalid event found.. aborting\n");
|
|
return -1;
|
|
}
|
|
|
|
kmem_page_size = pevent_get_page_size(evsel->tp_format->pevent);
|
|
}
|
|
|
|
symbol__init(&session->header.env);
|
|
|
|
if (!strcmp(argv[0], "stat")) {
|
|
setlocale(LC_ALL, "");
|
|
|
|
if (cpu__setup_cpunode_map())
|
|
goto out_delete;
|
|
|
|
if (list_empty(&caller_sort))
|
|
setup_sorting(&caller_sort, default_sort_order);
|
|
if (list_empty(&alloc_sort))
|
|
setup_sorting(&alloc_sort, default_sort_order);
|
|
|
|
ret = __cmd_kmem(session);
|
|
} else
|
|
usage_with_options(kmem_usage, kmem_options);
|
|
|
|
out_delete:
|
|
perf_session__delete(session);
|
|
|
|
return ret;
|
|
}
|
|
|