+ vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait.patch added to -mm tree

+ vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait.patch added to -mm tree

[akpm]

The patch titled
     vmscan: synchronous lumpy reclaim should not call congestion_wait()
has been added to the -mm tree.  Its filename is
     vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: vmscan: synchronous lumpy reclaim should not call congestion_wait()
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

congestion_wait() means "wait until queue congestion is cleared". 
However, synchronous lumpy reclaim does not need this congestion_wait() as
shrink_page_list(PAGEOUT_IO_SYNC) uses wait_on_page_writeback() and it
provides the necessary waiting.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |    2 --
 1 file changed, 2 deletions(-)

diff -puN mm/vmscan.c~vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait mm/vmscan.c
--- a/mm/vmscan.c~vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait
+++ a/mm/vmscan.c
@@ -1340,8 +1340,6 @@ shrink_inactive_list(unsigned long nr_to
 
 	/* Check if we should syncronously wait for writeback */
 	if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
-		congestion_wait(BLK_RW_ASYNC, HZ/10);
-
 		/*
 		 * The attempt at page out may have made some
 		 * of the pages active, mark them inactive again.
_

Patches currently in -mm which might be from kosaki.motohiro@jp.fujitsu.com are

oom-always-return-a-badness-score-of-non-zero-for-eligible-tasks.patch
linux-next.patch
vmscan-check-all_unreclaimable-in-direct-reclaim-path.patch
vmscan-check-all_unreclaimable-in-direct-reclaim-path-v2.patch
proc-pid-smaps-fix-dirty-pages-accounting.patch
proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping.patch
oom-filter-unkillable-tasks-from-tasklist-dump.patch
security-add-const-to-security_task_setscheduler.patch
sched-make-sched_param-argument-static-variables-in-some-sched_setscheduler-caller.patch
oom-add-per-mm-oom-disable-count.patch
oom-avoid-killing-a-task-if-a-thread-sharing-its-mm-cannot-be-killed.patch
oom-kill-all-threads-sharing-oom-killed-tasks-mm.patch
oom-kill-all-threads-sharing-oom-killed-tasks-mm-fix.patch
oom-kill-all-threads-sharing-oom-killed-tasks-mm-fix-fix.patch
oom-rewrite-error-handling-for-oom_adj-and-oom_score_adj-tunables.patch
oom-fix-locking-for-oom_adj-and-oom_score_adj.patch
mm-only-build-per-node-scan_unevictable-functions-when-numa-is-enabled.patch
vmscan-prevent-background-aging-of-anon-page-in-no-swap-system.patch
mm-mempolicy-check-return-code-of-check_range.patch
mm-add-account_page_writeback.patch
writeback-add-nr_dirtied-and-nr_written-to-proc-vmstat.patch
writeback-add-nr_dirtied-and-nr_written-to-proc-vmstat-update.patch
writeback-add-sys-devices-system-node-node-vmstat.patch
writeback-add-sys-devices-system-node-node-vmstat-update.patch
writeback-report-dirty-thresholds-in-proc-vmstat.patch
vmscan-delete-dead-code.patch
tracing-vmscan-add-trace-events-for-lru-list-shrinking.patch
writeback-account-for-time-spent-congestion_waited.patch
vmscan-synchronous-lumpy-reclaim-should-not-call-congestion_wait.patch
vmscan-narrow-the-scenarios-lumpy-reclaim-uses-synchrounous-reclaim.patch
vmscan-remove-dead-code-in-shrink_inactive_list.patch
vmscan-isolated_lru_pages-stop-neighbour-search-if-neighbour-cannot-be-isolated.patch
writeback-do-not-sleep-on-the-congestion-queue-if-there-are-no-congested-bdis.patch
writeback-do-not-sleep-on-the-congestion-queue-if-there-are-no-congested-bdis-or-if-significant-congestion-is-not-being-encountered-in-the-current-zone.patch
core_pattern-fix-long-parameters-was-truncated-by-core_pattern-handler.patch
core_pattern-fix-long-parameters-was-truncated-by-core_pattern-handler-update.patch
core_pattern-fix-long-parameters-was-truncated-by-core_pattern-handler-update-2.patch
reiser4.patch