Commit 84ad5802 authored Jan 14, 2016 by Johannes Weiner Committed by Linus Torvalds Jan 14, 2016

proc: meminfo: estimate available memory more conservatively



The MemAvailable item in /proc/meminfo is to give users a hint of how
much memory is allocatable without causing swapping, so it excludes the
zones' low watermarks as unavailable to userspace.

However, for a userspace allocation, kswapd will actually reclaim until
the free pages hit a combination of the high watermark and the page
allocator's lowmem protection that keeps a certain amount of DMA and
DMA32 memory from userspace as well.

Subtract the full amount we know to be unavailable to userspace from the
number of free pages when calculating MemAvailable.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent a8d01437

fs/proc/meminfo.c

+1 −4

Original line number	Diff line number	Diff line
		@@ -57,11 +57,8 @@ static int meminfo_proc_show(struct seq_file m, void v)
		/*
		* Estimate the amount of memory available for userspace allocations,
		* without causing swapping.
		*
		* Free memory cannot be taken below the low watermark, before the
		* system starts swapping.
		*/
		available = i.freeram - wmark_low;
		available = i.freeram - totalreserve_pages;

		/*
		* Not all the page cache can be freed, otherwise the system will

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