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authorVlastimil Babka <vbabka@suse.cz>2014-12-10 15:43:01 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:05 -0800
commit93481ff0e5a0c7636359a7ee52248856da5e7859 (patch)
tree8b1fa87f8eac2d448ffdd53c8c7e3d84308de510 /mm/memory_hotplug.c
parent8612c6639b70c59308cf37ae4790817df9621281 (diff)
mm: introduce single zone pcplists drain
The functions for draining per-cpu pages back to buddy allocators currently always operate on all zones. There are however several cases where the drain is only needed in the context of a single zone, and spilling other pcplists is a waste of time both due to the extra spilling and later refilling. This patch introduces new zone pointer parameter to drain_all_pages() and changes the dummy parameter of drain_local_pages() to be also a zone pointer. When NULL is passed, the functions operate on all zones as usual. Passing a specific zone pointer reduces the work to the single zone. All callers are updated to pass the NULL pointer in this patch. Conversion to single zone (where appropriate) is done in further patches. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Vladimir Davydov <vdavydov@parallels.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 1bf4807cb21e..aa0c6e5a3065 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1725,7 +1725,7 @@ repeat:
if (drain) {
lru_add_drain_all();
cond_resched();
- drain_all_pages();
+ drain_all_pages(NULL);
}
pfn = scan_movable_pages(start_pfn, end_pfn);
@@ -1747,7 +1747,7 @@ repeat:
lru_add_drain_all();
yield();
/* drain pcp pages, this is synchronous. */
- drain_all_pages();
+ drain_all_pages(NULL);
/*
* dissolve free hugepages in the memory block before doing offlining
* actually in order to make hugetlbfs's object counting consistent.