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mm/compaction: reduce the difference between low and high watermarks

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Reduce the diff between low and high watermarks when compaction
proactiveness is set to high.  This allows users who set the proactiveness
really high to have more stable fragmentation score over time.

Link: https://lkml.kernel.org/r/20250404111103.1994507-3-mclapinski@google.com
Signed-off-by: Michal Clapinski <mclapinski@google.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Michal Clapinski
2025-04-04 13:11:03 +02:00
committed by Andrew Morton
parent bb317f00b9
commit 98c9389042
2 changed files with 9 additions and 2 deletions
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6
Documentation/admin-guide/sysctl/vm.rst
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@@ -131,6 +131,12 @@ to latency spikes in unsuspecting applications. The kernel employs
various heuristics to avoid wasting CPU cycles if it detects that
proactive compaction is not being effective.
Setting the value above 80 will, in addition to lowering the acceptable level
of fragmentation, make the compaction code more sensitive to increases in
fragmentation, i.e. compaction will trigger more often, but reduce
fragmentation by a smaller amount.
This makes the fragmentation level more stable over time.
Be careful when setting it to extreme values like 100, as that may
cause excessive background compaction activity.