diff options
| author | Michal Clapinski <mclapinski@google.com> | 2025-04-04 13:11:03 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-05-11 17:48:10 -0700 |
| commit | 98c9389042f4d1e6aa73fbaf79e2e962c9497fc5 (patch) | |
| tree | b80454b5866955a947603340fd58f07a1ced4c5f /Documentation/admin-guide/sysctl | |
| parent | mm/compaction: remove low watermark cap for proactive compaction (diff) | |
| download | linux-98c9389042f4d1e6aa73fbaf79e2e962c9497fc5.tar.gz linux-98c9389042f4d1e6aa73fbaf79e2e962c9497fc5.zip | |
mm/compaction: reduce the difference between low and high watermarks
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>
Diffstat (limited to 'Documentation/admin-guide/sysctl')
| -rw-r--r-- | Documentation/admin-guide/sysctl/vm.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst index 8290177b4f75..b325bfbc2611 100644 --- a/Documentation/admin-guide/sysctl/vm.rst +++ b/Documentation/admin-guide/sysctl/vm.rst @@ -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. |