diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2016-01-14 15:20:15 -0800 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-11-29 15:25:03 +0800 |
| commit | aaaf9e59c00aa2ff9c2bd1da05c0cf1ba2a9634a (patch) | |
| tree | 6e21c2802b29ed74c99a272ea7d988bd875ba80e /mm/page-writeback.c | |
| parent | 83595f56588d5f5d677e62a576b6248328862b34 (diff) | |
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>
(cherry picked from commit a8d0143730d7b42c9fe6d1435d92ecce6863a62a)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index fd51ebfc423f..1e6769449ac2 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); |