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mm: page_alloc: generalize the dirty balance reserve

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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 <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2016-01-14 15:20:15 -08:00 • committed by Linus Torvalds
commit a8d0143730
4 changed files with 18 additions and 24 deletions
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14
mm/page-writeback.c
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@ -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);