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| author | Mel Gorman <mgorman@techsingularity.net> | 2021-11-05 21:42:42 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-06 21:30:40 +0100 |
| commit | c3f4a9a2b082c5392fbff17c6d8551154add5fdb (patch) | |
| tree | 94211c0936f4a7fcadcc0ab42fd030a6cffd61e9 /mm/internal.h | |
| parent | mm/page_alloc: remove the throttling logic from the page allocator (diff) | |
| download | linux-c3f4a9a2b082c5392fbff17c6d8551154add5fdb.tar.xz linux-c3f4a9a2b082c5392fbff17c6d8551154add5fdb.zip | |
mm/vmscan: centralise timeout values for reclaim_throttle
Neil Brown raised concerns about callers of reclaim_throttle specifying
a timeout value. The original timeout values to congestion_wait() were
probably pulled out of thin air or copy&pasted from somewhere else.
This patch centralises the timeout values and selects a timeout based on
the reason for reclaim throttling. These figures are also pulled out of
the same thin air but better values may be derived
Running a workload that is throttling for inappropriate periods and
tracing mm_vmscan_throttled can be used to pick a more appropriate
value. Excessive throttling would pick a lower timeout where as
excessive CPU usage in reclaim context would select a larger timeout.
Ideally a large value would always be used and the wakeups would occur
before a timeout but that requires careful testing.
Link: https://lkml.kernel.org/r/20211022144651.19914-7-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: "Darrick J . Wong" <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Rik van Riel <riel@surriel.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/internal.h b/mm/internal.h index 7dfe74f827bf..f3de3a2f3e30 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -130,8 +130,7 @@ extern unsigned long highest_memmap_pfn; */ extern int isolate_lru_page(struct page *page); extern void putback_lru_page(struct page *page); -extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason, - long timeout); +extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason); /* * in mm/rmap.c: |