The patch titled Subject: mm,vmscan: only evict file pages when we have plenty has been removed from the -mm tree. Its filename was mmvmscan-only-evict-file-pages-when-we-have-plenty.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Rik van Riel <riel@xxxxxxxxxx> Subject: mm,vmscan: only evict file pages when we have plenty If we have more inactive file pages than active file pages, we skip scanning the active file pages altogether, with the idea that we do not want to evict the working set when there is plenty of streaming IO in the cache. However, the code forgot to also skip scanning anonymous pages in that situation. That leads to the curious situation of keeping the active file pages protected from being paged out when there are lots of inactive file pages, while still scanning and evicting anonymous pages. This patch fixes that situation, by only evicting file pages when we have plenty of them and most are inactive. [akpm@xxxxxxxxxxxxxxxxxxxx: adjust comment layout] Signed-off-by: Rik van Riel <riel@xxxxxxxxxx> Cc: Mel Gorman <mel@xxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/vmscan.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff -puN mm/vmscan.c~mmvmscan-only-evict-file-pages-when-we-have-plenty mm/vmscan.c --- a/mm/vmscan.c~mmvmscan-only-evict-file-pages-when-we-have-plenty +++ a/mm/vmscan.c @@ -1679,13 +1679,24 @@ static void get_scan_count(struct lruvec if (global_reclaim(sc)) { free = zone_page_state(zone, NR_FREE_PAGES); - /* If we have very few page cache pages, - force-scan anon pages. */ if (unlikely(file + free <= high_wmark_pages(zone))) { + /* + * If we have very few page cache pages, force-scan + * anon pages. + */ fraction[0] = 1; fraction[1] = 0; denominator = 1; goto out; + } else if (!inactive_file_is_low_global(zone)) { + /* + * There is enough inactive page cache, do not + * reclaim anything from the working set right now. + */ + fraction[0] = 0; + fraction[1] = 1; + denominator = 1; + goto out; } } _ Patches currently in -mm which might be from riel@xxxxxxxxxx are origin.patch mm-compaction-fix-compiler-warning.patch mm-protect-against-concurrent-vma-expansion.patch linux-next.patch swap-add-a-simple-detector-for-inappropriate-swapin-readahead.patch swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch mm-add-vm-event-counters-for-balloon-pages-compaction.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html