perf record: Introduce a symtab cache

Now a cache will be created in a ~/.debug debuginfo like
hierarchy, so that at the end of a 'perf record' session all the
binaries (with build-ids) involved get collected and indexed by
their build-ids, so that perf report can find them.

This is interesting when developing software where you want to
do a 'perf diff' with the previous build and opens avenues for
lots more interesting tools, like a 'perf diff --graph' that
takes more than two binaries into account.

Tunables for collecting just the symtabs can be added if one
doesn't want to have the full binary, but having the full binary
allows things like 'perf rerecord' or other tools that can
re-run the tests by having access to the exact binary in some
perf.data file, so it may well be interesting to keep the full
binary there.

Space consumption is minimised by trying to use hard links, a
'perf cache' tool to manage the space used, a la ccache is
required to purge older entries.

With this in place it will be possible also to introduce new
commands, 'perf archive' and 'perf restore' (or some more
suitable and future proof names) to create a cpio/tar file with
the perf data and the files in the cache that _had_ perf hits of
interest.

There are more aspects to polish, like finding the right vmlinux
file to cache, etc, but this is enough for a first step.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1261957026-15580-10-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-12-27 21:37:06 -02:00 committed by Ingo Molnar
parent 55aa640f54
commit 4cf40131a5
6 changed files with 165 additions and 9 deletions

View file

@ -425,6 +425,7 @@ LIB_OBJS += util/svghelper.o
LIB_OBJS += util/sort.o
LIB_OBJS += util/hist.o
LIB_OBJS += util/probe-event.o
LIB_OBJS += util/util.o
BUILTIN_OBJS += builtin-annotate.o

View file

@ -169,20 +169,23 @@ static int do_write(int fd, const void *buf, size_t size)
return 0;
}
#define dsos__for_each_with_build_id(pos, head) \
list_for_each_entry(pos, head, node) \
if (!pos->has_build_id) \
continue; \
else
static int __dsos__write_buildid_table(struct list_head *head, int fd)
{
#define NAME_ALIGN 64
struct dso *pos;
static const char zero_buf[NAME_ALIGN];
list_for_each_entry(pos, head, node) {
dsos__for_each_with_build_id(pos, head) {
int err;
struct build_id_event b;
size_t len;
size_t len = pos->long_name_len + 1;
if (!pos->has_build_id)
continue;
len = pos->long_name_len + 1;
len = ALIGN(len, NAME_ALIGN);
memset(&b, 0, sizeof(b));
memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
@ -209,6 +212,74 @@ static int dsos__write_buildid_table(int fd)
return err;
}
static int dso__cache_build_id(struct dso *self, const char *debugdir)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
*linkname = malloc(size), *targetname, *sbuild_id;
int len, err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
len = snprintf(filename, size, "%s%s", debugdir, self->long_name);
if (mkdir_p(filename, 0755))
goto out_free;
len += snprintf(filename + len, sizeof(filename) - len, "/");
sbuild_id = filename + len;
build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
if (access(filename, F_OK) && link(self->long_name, filename) &&
copyfile(self->long_name, filename))
goto out_free;
len = snprintf(linkname, size, "%s/.build-id/%.2s",
debugdir, sbuild_id);
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
goto out_free;
snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
targetname = filename + strlen(debugdir) - 5;
memcpy(targetname, "../..", 5);
if (symlink(targetname, linkname) == 0)
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
{
struct dso *pos;
int err = 0;
dsos__for_each_with_build_id(pos, head)
if (dso__cache_build_id(pos, debugdir))
err = -1;
return err;
}
static int dsos__cache_build_ids(void)
{
int err_kernel, err_user;
char debugdir[PATH_MAX];
snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),
DEBUG_CACHE_DIR);
if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
return -1;
err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);
err_user = __dsos__cache_build_ids(&dsos__user, debugdir);
return err_kernel || err_user ? -1 : 0;
}
static int perf_header__adds_write(struct perf_header *self, int fd)
{
int nr_sections;
@ -258,6 +329,7 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
goto out_free;
}
buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
dsos__cache_build_ids();
}
lseek(fd, sec_start, SEEK_SET);

View file

@ -22,6 +22,7 @@
enum dso_origin {
DSO__ORIG_KERNEL = 0,
DSO__ORIG_JAVA_JIT,
DSO__ORIG_BUILD_ID_CACHE,
DSO__ORIG_FEDORA,
DSO__ORIG_UBUNTU,
DSO__ORIG_BUILDID,
@ -1191,6 +1192,7 @@ char dso__symtab_origin(const struct dso *self)
static const char origin[] = {
[DSO__ORIG_KERNEL] = 'k',
[DSO__ORIG_JAVA_JIT] = 'j',
[DSO__ORIG_BUILD_ID_CACHE] = 'B',
[DSO__ORIG_FEDORA] = 'f',
[DSO__ORIG_UBUNTU] = 'u',
[DSO__ORIG_BUILDID] = 'b',
@ -1209,6 +1211,7 @@ int dso__load(struct dso *self, struct map *map, struct perf_session *session,
int size = PATH_MAX;
char *name;
u8 build_id[BUILD_ID_SIZE];
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
int ret = -1;
int fd;
@ -1230,8 +1233,16 @@ int dso__load(struct dso *self, struct map *map, struct perf_session *session,
return ret;
}
self->origin = DSO__ORIG_FEDORA - 1;
self->origin = DSO__ORIG_BUILD_ID_CACHE;
if (self->has_build_id) {
build_id__sprintf(self->build_id, sizeof(self->build_id),
build_id_hex);
snprintf(name, size, "%s/%s/.build-id/%.2s/%s",
getenv("HOME"), DEBUG_CACHE_DIR,
build_id_hex, build_id_hex + 2);
goto open_file;
}
more:
do {
self->origin++;
@ -1247,8 +1258,6 @@ more:
case DSO__ORIG_BUILDID:
if (filename__read_build_id(self->long_name, build_id,
sizeof(build_id))) {
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
build_id__sprintf(build_id, sizeof(build_id),
build_id_hex);
snprintf(name, size,
@ -1276,7 +1285,7 @@ compare_build_id:
if (!dso__build_id_equal(self, build_id))
goto more;
}
open_file:
fd = open(name, O_RDONLY);
} while (fd < 0);

View file

@ -8,6 +8,8 @@
#include <linux/rbtree.h>
#include "event.h"
#define DEBUG_CACHE_DIR ".debug"
#ifdef HAVE_CPLUS_DEMANGLE
extern char *cplus_demangle(const char *, int);

69
tools/perf/util/util.c Normal file
View file

@ -0,0 +1,69 @@
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
int mkdir_p(char *path, mode_t mode)
{
struct stat st;
int err;
char *d = path;
if (*d != '/')
return -1;
if (stat(path, &st) == 0)
return 0;
while (*++d == '/');
while ((d = strchr(d, '/'))) {
*d = '\0';
err = stat(path, &st) && mkdir(path, mode);
*d++ = '/';
if (err)
return -1;
while (*d == '/')
++d;
}
return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
}
int copyfile(const char *from, const char *to)
{
int fromfd, tofd;
struct stat st;
void *addr;
int err = -1;
if (stat(from, &st))
goto out;
fromfd = open(from, O_RDONLY);
if (fromfd < 0)
goto out;
tofd = creat(to, 0755);
if (tofd < 0)
goto out_close_from;
addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
if (addr == MAP_FAILED)
goto out_close_to;
if (write(tofd, addr, st.st_size) == st.st_size)
err = 0;
munmap(addr, st.st_size);
out_close_to:
close(tofd);
if (err)
unlink(to);
out_close_from:
close(fromfd);
out:
return err;
}

View file

@ -403,4 +403,7 @@ void git_qsort(void *base, size_t nmemb, size_t size,
#endif
#endif
int mkdir_p(char *path, mode_t mode);
int copyfile(const char *from, const char *to);
#endif