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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>
This commit is contained in:
Roman Gushchin 2018-04-10 16:27:36 -07:00 committed by Linus Torvalds
parent f77cfbe645
commit eb59254608
2 changed files with 2 additions and 0 deletions
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1
include/linux/mmzone.h
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@ -180,6 +180,7 @@ enum node_stat_item {
NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */ NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */
NR_DIRTIED, /* page dirtyings since bootup */ NR_DIRTIED, /* page dirtyings since bootup */
NR_WRITTEN, /* page writings since bootup */ NR_WRITTEN, /* page writings since bootup */
NR_INDIRECTLY_RECLAIMABLE_BYTES, /* measured in bytes */
NR_VM_NODE_STAT_ITEMS NR_VM_NODE_STAT_ITEMS
}; };

1
mm/vmstat.c
View File

@ -1161,6 +1161,7 @@ const char * const vmstat_text[] = {
"nr_vmscan_immediate_reclaim", "nr_vmscan_immediate_reclaim",
"nr_dirtied", "nr_dirtied",
"nr_written", "nr_written",
"nr_indirectly_reclaimable",
/* enum writeback_stat_item counters */ /* enum writeback_stat_item counters */
"nr_dirty_threshold", "nr_dirty_threshold",