diff options
| author | Baolin Wang <baolin.wang@linux.alibaba.com> | 2023-05-25 20:54:01 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-09 16:25:43 -0700 |
| commit | a8d13355c660255266ece529e81e6cb26754941a (patch) | |
| tree | dfe2bd54483341d923702fd88748062fe565a5ce | |
| parent | 447ba88658faa8dbfd29d557daa38b7d88f460ec (diff) | |
mm: compaction: skip fast freepages isolation if enough freepages are isolated
I've observed that fast isolation often isolates more pages than
cc->migratepages, and the excess freepages will be released back to the
buddy system. So skip fast freepages isolation if enough freepages are
isolated to save some CPU cycles.
Link: https://lkml.kernel.org/r/f39c2c07f2dba2732fd9c0843572e5bef96f7f67.1685018752.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/compaction.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index ce6293bf9c4a..767b0815c874 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1528,6 +1528,10 @@ static void fast_isolate_freepages(struct compact_control *cc) spin_unlock_irqrestore(&cc->zone->lock, flags); + /* Skip fast search if enough freepages isolated */ + if (cc->nr_freepages >= cc->nr_migratepages) + break; + /* * Smaller scan on next order so the total scan is related * to freelist_scan_limit. |