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mm: introduce NR_INDIRECTLY_RECLAIMABLE_BYTES

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Patch series "indirectly reclaimable memory", v2.

This patchset introduces the concept of indirectly reclaimable memory
and applies it to fix the issue of when a big number of dentries with
external names can significantly affect the MemAvailable value.

This patch (of 3):

Introduce a concept of indirectly reclaimable memory and adds the
corresponding memory counter and /proc/vmstat item.

Indirectly reclaimable memory is any sort of memory, used by the kernel
(except of reclaimable slabs), which is actually reclaimable, i.e.  will
be released under memory pressure.

The counter is in bytes, as it's not always possible to count such
objects in pages.  The name contains BYTES by analogy to
NR_KERNEL_STACK_KB.

Link: http://lkml.kernel.org/r/20180305133743.12746-2-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-Commit: eb59254608bc1d42c4c6afdcdce9c0d3ce02b318
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Change-Id: Ie15abc33dcb13091e3acfa04dd55c664e1a24e70
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
This commit is contained in:
Roman Gushchin 2018-04-10 16:27:36 -07:00 • committed by Vijayanand Jitta
parent cb0e8e7c96
commit 7e22f75445
2 changed files with 2 additions and 0 deletions
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1
include/linux/mmzone.h
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@ -176,6 +176,7 @@ enum zone_stat_item {
NR_ANON_TRANSPARENT_HUGEPAGES, NR_ANON_TRANSPARENT_HUGEPAGES,
NR_FREE_CMA_PAGES, NR_FREE_CMA_PAGES,
NR_SWAPCACHE, NR_SWAPCACHE,
NR_INDIRECTLY_RECLAIMABLE_BYTES, /* measured in bytes */
NR_VM_ZONE_STAT_ITEMS }; NR_VM_ZONE_STAT_ITEMS };
/* /*

1
mm/vmstat.c
View file

@ -765,6 +765,7 @@ const char * const vmstat_text[] = {
"nr_anon_transparent_hugepages", "nr_anon_transparent_hugepages",
"nr_free_cma", "nr_free_cma",
"nr_swapcache", "nr_swapcache",
"nr_indirectly_reclaimable",
/* enum writeback_stat_item counters */ /* enum writeback_stat_item counters */
"nr_dirty_threshold", "nr_dirty_threshold",