![Vlastimil Babka](/assets/img/avatar_default.png)
The vmstat NR_KERNEL_MISC_RECLAIMABLE counter is for kernel non-slab allocations that can be reclaimed via shrinker. In /proc/meminfo, we can show the sum of all reclaimable kernel allocations (including slab) as "KReclaimable". Add the same counter also to per-node meminfo under /sys With this counter, users will have more complete information about kernel memory usage. Non-slab reclaimable pages (currently just the ION allocator) will not be missing from /proc/meminfo, making users wonder where part of their memory went. More precisely, they already appear in MemAvailable, but without the new counter, it's not obvious why the value in MemAvailable doesn't fully correspond with the sum of other counters participating in it. Link: http://lkml.kernel.org/r/20180731090649.16028-6-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Roman Gushchin <guro@fb.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Vijayanand Jitta <vjitta@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
160 lines
5.1 KiB
C
160 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/mman.h>
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#include <linux/mmzone.h>
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#include <linux/proc_fs.h>
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#include <linux/percpu.h>
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#include <linux/quicklist.h>
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#include <linux/seq_file.h>
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#include <linux/swap.h>
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#include <linux/vmstat.h>
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#include <linux/atomic.h>
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#include <linux/vmalloc.h>
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#ifdef CONFIG_CMA
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#include <linux/cma.h>
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#endif
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include "internal.h"
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void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
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{
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}
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static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
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{
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seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
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seq_write(m, " kB\n", 4);
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}
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static int meminfo_proc_show(struct seq_file *m, void *v)
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{
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struct sysinfo i;
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unsigned long committed;
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long cached;
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long available;
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unsigned long pages[NR_LRU_LISTS];
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unsigned long sreclaimable, sunreclaim;
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int lru;
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si_meminfo(&i);
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si_swapinfo(&i);
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committed = percpu_counter_read_positive(&vm_committed_as);
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cached = global_node_page_state(NR_FILE_PAGES) -
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total_swapcache_pages() - i.bufferram;
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if (cached < 0)
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cached = 0;
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for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
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pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
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available = si_mem_available();
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sreclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE);
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sunreclaim = global_node_page_state(NR_SLAB_UNRECLAIMABLE);
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show_val_kb(m, "MemTotal: ", i.totalram);
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show_val_kb(m, "MemFree: ", i.freeram);
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show_val_kb(m, "MemAvailable: ", available);
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show_val_kb(m, "Buffers: ", i.bufferram);
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show_val_kb(m, "Cached: ", cached);
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show_val_kb(m, "SwapCached: ", total_swapcache_pages());
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show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] +
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pages[LRU_ACTIVE_FILE]);
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show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] +
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pages[LRU_INACTIVE_FILE]);
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show_val_kb(m, "Active(anon): ", pages[LRU_ACTIVE_ANON]);
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show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
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show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]);
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show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
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show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]);
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show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK));
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#ifdef CONFIG_HIGHMEM
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show_val_kb(m, "HighTotal: ", i.totalhigh);
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show_val_kb(m, "HighFree: ", i.freehigh);
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show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh);
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show_val_kb(m, "LowFree: ", i.freeram - i.freehigh);
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#endif
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#ifndef CONFIG_MMU
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show_val_kb(m, "MmapCopy: ",
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(unsigned long)atomic_long_read(&mmap_pages_allocated));
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#endif
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show_val_kb(m, "SwapTotal: ", i.totalswap);
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show_val_kb(m, "SwapFree: ", i.freeswap);
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show_val_kb(m, "Dirty: ",
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global_node_page_state(NR_FILE_DIRTY));
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show_val_kb(m, "Writeback: ",
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global_node_page_state(NR_WRITEBACK));
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show_val_kb(m, "AnonPages: ",
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global_node_page_state(NR_ANON_MAPPED));
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show_val_kb(m, "Mapped: ",
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global_node_page_state(NR_FILE_MAPPED));
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show_val_kb(m, "Shmem: ", i.sharedram);
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show_val_kb(m, "KReclaimable: ", sreclaimable +
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global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
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show_val_kb(m, "Slab: ", sreclaimable + sunreclaim);
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show_val_kb(m, "SReclaimable: ", sreclaimable);
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show_val_kb(m, "SUnreclaim: ", sunreclaim);
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seq_printf(m, "KernelStack: %8lu kB\n",
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global_zone_page_state(NR_KERNEL_STACK_KB));
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show_val_kb(m, "PageTables: ",
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global_zone_page_state(NR_PAGETABLE));
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#ifdef CONFIG_QUICKLIST
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show_val_kb(m, "Quicklists: ", quicklist_total_size());
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#endif
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show_val_kb(m, "NFS_Unstable: ",
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global_node_page_state(NR_UNSTABLE_NFS));
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show_val_kb(m, "Bounce: ",
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global_zone_page_state(NR_BOUNCE));
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show_val_kb(m, "WritebackTmp: ",
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global_node_page_state(NR_WRITEBACK_TEMP));
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show_val_kb(m, "CommitLimit: ", vm_commit_limit());
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show_val_kb(m, "Committed_AS: ", committed);
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seq_printf(m, "VmallocTotal: %8lu kB\n",
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(unsigned long)VMALLOC_TOTAL >> 10);
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show_val_kb(m, "VmallocUsed: ", 0ul);
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show_val_kb(m, "VmallocChunk: ", 0ul);
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show_val_kb(m, "Percpu: ", pcpu_nr_pages());
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#ifdef CONFIG_MEMORY_FAILURE
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seq_printf(m, "HardwareCorrupted: %5lu kB\n",
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atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
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#endif
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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show_val_kb(m, "AnonHugePages: ",
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global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
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show_val_kb(m, "ShmemHugePages: ",
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global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
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show_val_kb(m, "ShmemPmdMapped: ",
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global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
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#endif
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#ifdef CONFIG_CMA
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show_val_kb(m, "CmaTotal: ", totalcma_pages);
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show_val_kb(m, "CmaFree: ",
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global_zone_page_state(NR_FREE_CMA_PAGES));
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#endif
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hugetlb_report_meminfo(m);
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arch_report_meminfo(m);
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return 0;
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}
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static int __init proc_meminfo_init(void)
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{
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proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
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return 0;
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}
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fs_initcall(proc_meminfo_init);
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