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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>
This commit is contained in:
Johannes Weiner 2016-01-14 15:20:15 -08:00 committed by Linus Torvalds
parent c20cd45eb0
commit a8d0143730
4 changed files with 18 additions and 24 deletions
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6
include/linux/mmzone.h
View File

@ -356,10 +356,10 @@ struct zone {
struct per_cpu_pageset __percpu *pageset;
/*
* This is a per-zone reserve of pages that should not be
* considered dirtyable memory.
* This is a per-zone reserve of pages that are not available
* to userspace allocations.
*/
unsigned long dirty_balance_reserve;
unsigned long totalreserve_pages;
#ifndef CONFIG_SPARSEMEM
/*

1
include/linux/swap.h
View File

@ -287,7 +287,6 @@ static inline void workingset_node_shadows_dec(struct radix_tree_node *node)
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
extern unsigned long dirty_balance_reserve;
extern unsigned long nr_free_buffer_pages(void);
extern unsigned long nr_free_pagecache_pages(void);

14
mm/page-writeback.c
View File

@ -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);

21
mm/page_alloc.c
View File

@ -114,13 +114,6 @@ static DEFINE_SPINLOCK(managed_page_count_lock);
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long totalcma_pages __read_mostly;
/*
* When calculating the number of globally allowed dirty pages, there
* is a certain number of per-zone reserves that should not be
* considered dirtyable memory. This is the sum of those reserves
* over all existing zones that contribute dirtyable memory.
*/
unsigned long dirty_balance_reserve __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
@ -5942,20 +5935,12 @@ static void calculate_totalreserve_pages(void)
if (max > zone->managed_pages)
max = zone->managed_pages;
zone->totalreserve_pages = max;
reserve_pages += max;
/*
* Lowmem reserves are not available to
* GFP_HIGHUSER page cache allocations and
* kswapd tries to balance zones to their high
* watermark. As a result, neither should be
* regarded as dirtyable memory, to prevent a
* situation where reclaim has to clean pages
* in order to balance the zones.
*/
zone->dirty_balance_reserve = max;
}
}
dirty_balance_reserve = reserve_pages;
totalreserve_pages = reserve_pages;
}