The patch titled
Subject: mm: vmscan: immediately reclaim end-of-LRU dirty pages when writeback completes
has been removed from the -mm tree. Its filename was
mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxx>
Subject: mm: vmscan: immediately reclaim end-of-LRU dirty pages when writeback completes
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@xxxxxxx>
Acked-by: Johannes Weiner <jweiner@xxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Alex Elder <aelder@xxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmzone.h | 2 +-
mm/vmscan.c | 10 +++++++++-
mm/vmstat.c | 2 +-
3 files changed, 11 insertions(+), 3 deletions(-)
diff -puN include/linux/mmzone.h~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes include/linux/mmzone.h
--- a/include/linux/mmzone.h~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes
+++ a/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 -puN mm/vmscan.c~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes
+++ a/mm/vmscan.c
@@ -866,7 +866,15 @@ static unsigned long shrink_page_list(st
*/
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 -puN mm/vmstat.c~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes mm/vmstat.c
--- a/mm/vmstat.c~mm-vmscan-immediately-reclaim-end-of-lru-dirty-pages-when-writeback-completes
+++ a/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",
_
Patches currently in -mm which might be from mgorman@xxxxxxx are
origin.patch
mm-page-writebackc-make-determine_dirtyable_memory-static-again.patch
thp-tail-page-refcounting-fix-5.patch
powerpc-remove-superfluous-pagetail-checks-on-the-pte-gup_fast.patch
powerpc-get_hugepte-dont-put_page-the-wrong-page.patch
powerpc-gup_hugepte-avoid-to-free-the-head-page-too-many-times.patch
powerpc-gup_hugepte-support-thp-based-tail-recounting.patch
powerpc-gup_huge_pmd-return-0-if-pte-changes.patch
s390-gup_huge_pmd-support-thp-tail-recounting.patch
s390-gup_huge_pmd-return-0-if-pte-changes.patch
sparc-gup_pte_range-support-thp-based-tail-recounting.patch
thp-share-get_huge_page_tail.patch
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