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authorRoman Gushchin <guro@fb.com>2018-04-11 02:27:36 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 20:28:29 +0300
commiteb59254608bc1d42c4c6afdcdce9c0d3ce02b318 (patch)
tree68d822dcee68e63451392b182275b0d8124b73e8 /include/linux/mmzone.h
parentf77cfbe6455a67d4e9b69f08f07fc62cd11b0674 (diff)
downloadlinux-eb59254608bc1d42c4c6afdcdce9c0d3ce02b318.tar.xz
mm: introduce NR_INDIRECTLY_RECLAIMABLE_BYTES
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>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f11ae29005f1..a0c9e45a859a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -180,6 +180,7 @@ enum node_stat_item {
NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */
NR_DIRTIED, /* page dirtyings since bootup */
NR_WRITTEN, /* page writings since bootup */
+ NR_INDIRECTLY_RECLAIMABLE_BYTES, /* measured in bytes */
NR_VM_NODE_STAT_ITEMS
};