[merged] mm-page_alloc-remove-unnecessary-taking-of-a-seqlock-when-cpusets-are-disabled.patch removed from -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: mm, page_alloc: remove unnecessary taking of a seqlock when cpusets are disabled
has been removed from the -mm tree.  Its filename was
     mm-page_alloc-remove-unnecessary-taking-of-a-seqlock-when-cpusets-are-disabled.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: mm, page_alloc: remove unnecessary taking of a seqlock when cpusets are disabled

There is a seqcounter that protects against spurious allocation failures
when a task is changing the allowed nodes in a cpuset.  There is no need
to check the seqcounter until a cpuset exists.

Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vitaly Wool <vitalywool@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 include/linux/cpuset.h |    6 ++++++
 1 file changed, 6 insertions(+)

diff -puN include/linux/cpuset.h~mm-page_alloc-remove-unnecessary-taking-of-a-seqlock-when-cpusets-are-disabled include/linux/cpuset.h
--- a/include/linux/cpuset.h~mm-page_alloc-remove-unnecessary-taking-of-a-seqlock-when-cpusets-are-disabled
+++ a/include/linux/cpuset.h
@@ -104,6 +104,9 @@ extern void cpuset_print_current_mems_al
  */
 static inline unsigned int read_mems_allowed_begin(void)
 {
+	if (!cpusets_enabled())
+		return 0;
+
 	return read_seqcount_begin(&current->mems_allowed_seq);
 }
 
@@ -115,6 +118,9 @@ static inline unsigned int read_mems_all
  */
 static inline bool read_mems_allowed_retry(unsigned int seq)
 {
+	if (!cpusets_enabled())
+		return false;
+
 	return read_seqcount_retry(&current->mems_allowed_seq, seq);
 }
 
_

Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are


--
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