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>
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@ -1528,6 +1528,10 @@ static void fast_isolate_freepages(struct compact_control *cc)
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spin_unlock_irqrestore(&cc->zone->lock, flags);
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/* Skip fast search if enough freepages isolated */
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if (cc->nr_freepages >= cc->nr_migratepages)
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break;
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/*
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* Smaller scan on next order so the total scan is related
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* to freelist_scan_limit.
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