[PATCH 7/7] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes
From: Mel Gorman <mgorman@suse.de>
Date: 2011-08-10 10:47:41
Also in:
linux-xfs, lkml
Subsystem:
memory management, memory management - core, memory management - mglru (multi-gen lru), memory management - reclaim, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Johannes Weiner, Linus Torvalds
When direct reclaim encounters a dirty page, it gets recycled around the LRU for another cycle. This patch marks the page PageReclaim similar to deactivate_page() so that the page gets reclaimed almost immediately after the page gets cleaned. This is to avoid reclaiming clean pages that are younger than a dirty page encountered at the end of the LRU that might have been something like a use-once page. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Johannes Weiner <redacted> --- include/linux/mmzone.h | 2 +- mm/vmscan.c | 10 +++++++++- mm/vmstat.c | 2 +- 3 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index b70a0c0..c9c5797 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h@@ -100,7 +100,7 @@ enum zone_stat_item { NR_UNSTABLE_NFS, /* NFS unstable pages */ NR_BOUNCE, NR_VMSCAN_WRITE, - NR_VMSCAN_WRITE_SKIP, + NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */ NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */ NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */ NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b0437f2..33882a3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c@@ -826,7 +826,15 @@ static unsigned long shrink_page_list(struct list_head *page_list, */ if (page_is_file_cache(page) && (!current_is_kswapd() || priority >= DEF_PRIORITY - 2)) { - inc_zone_page_state(page, NR_VMSCAN_WRITE_SKIP); + /* + * Immediately reclaim when written back. + * Similar in principal to deactivate_page() + * except we already have the page isolated + * and know it's dirty + */ + inc_zone_page_state(page, NR_VMSCAN_IMMEDIATE); + SetPageReclaim(page); + goto keep_locked; }
diff --git a/mm/vmstat.c b/mm/vmstat.c
index fd109f3..471b20b 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c@@ -702,7 +702,7 @@ const char * const vmstat_text[] = { "nr_unstable", "nr_bounce", "nr_vmscan_write", - "nr_vmscan_write_skip", + "nr_vmscan_immediate_reclaim", "nr_writeback_temp", "nr_isolated_anon", "nr_isolated_file",
--
1.7.3.4
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