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authorJohannes Weiner <hannes@cmpxchg.org>2016-01-15 02:20:15 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 03:00:49 +0300
commita8d0143730d7b42c9fe6d1435d92ecce6863a62a (patch)
tree349dcd7f40a1b1d25702180493b93b720242a9bd /mm/page-writeback.c
parentc20cd45eb01748f0fba77a504f956b000df4ea73 (diff)
downloadlinux-a8d0143730d7b42c9fe6d1435d92ecce6863a62a.tar.xz
mm: page_alloc: generalize the dirty balance reserve
The dirty balance reserve that dirty throttling has to consider is merely memory not available to userspace allocations. There is nothing writeback-specific about it. Generalize the name so that it's reusable outside of that context. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index d15d88c8efa1..6fe7d15bd1f7 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -278,7 +278,12 @@ static unsigned long zone_dirtyable_memory(struct zone *zone)
unsigned long nr_pages;
nr_pages = zone_page_state(zone, NR_FREE_PAGES);
- nr_pages -= min(nr_pages, zone->dirty_balance_reserve);
+ /*
+ * Pages reserved for the kernel should not be considered
+ * dirtyable, to prevent a situation where reclaim has to
+ * clean pages in order to balance the zones.
+ */
+ nr_pages -= min(nr_pages, zone->totalreserve_pages);
nr_pages += zone_page_state(zone, NR_INACTIVE_FILE);
nr_pages += zone_page_state(zone, NR_ACTIVE_FILE);
@@ -332,7 +337,12 @@ static unsigned long global_dirtyable_memory(void)
unsigned long x;
x = global_page_state(NR_FREE_PAGES);
- x -= min(x, dirty_balance_reserve);
+ /*
+ * Pages reserved for the kernel should not be considered
+ * dirtyable, to prevent a situation where reclaim has to
+ * clean pages in order to balance the zones.
+ */
+ x -= min(x, totalreserve_pages);
x += global_page_state(NR_INACTIVE_FILE);
x += global_page_state(NR_ACTIVE_FILE);