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vmscan: fix it to take care of nodemask 

try_to_free_pages() is used for the direct reclaim of up to
SWAP_CLUSTER_MAX pages when watermarks are low.  The caller to
alloc_pages_nodemask() can specify a nodemask of nodes that are allowed to
be used but this is not passed to try_to_free_pages().  This can lead to
unnecessary reclaim of pages that are unusable by the caller and int the
worst case lead to allocation failure as progress was not been make where
it is needed.

This patch passes the nodemask used for alloc_pages_nodemask() to
try_to_free_pages().

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-03-31 15:23:31 -07:00 committed by Linus Torvalds
parent 2678958e12
commit 327c0e9686
4 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/buffer.c
View File

@ -290,7 +290,7 @@ static void free_more_memory(void)
&zone);
if (zone)
try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0,
GFP_NOFS);
GFP_NOFS, NULL);
}
}

2
include/linux/swap.h
View File

@ -212,7 +212,7 @@ static inline void lru_cache_add_active_file(struct page *page)
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask);
gfp_t gfp_mask, nodemask_t *mask);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap,
unsigned int swappiness);

3
mm/page_alloc.c
View File

@ -1582,7 +1582,8 @@ nofail_alloc:
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;
did_some_progress = try_to_free_pages(zonelist, order, gfp_mask);
did_some_progress = try_to_free_pages(zonelist, order,
gfp_mask, nodemask);
p->reclaim_state = NULL;
lockdep_clear_current_reclaim_state();

13
mm/vmscan.c
View File

@ -78,6 +78,12 @@ struct scan_control {
/* Which cgroup do we reclaim from */
struct mem_cgroup *mem_cgroup;
/*
* Nodemask of nodes allowed by the caller. If NULL, all nodes
* are scanned.
*/
nodemask_t *nodemask;
/* Pluggable isolate pages callback */
unsigned long (*isolate_pages)(unsigned long nr, struct list_head *dst,
unsigned long *scanned, int order, int mode,
@ -1538,7 +1544,8 @@ static void shrink_zones(int priority, struct zonelist *zonelist,
struct zone *zone;
sc->all_unreclaimable = 1;
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
sc->nodemask) {
if (!populated_zone(zone))
continue;
/*
@ -1683,7 +1690,7 @@ out:
}
unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask)
gfp_t gfp_mask, nodemask_t *nodemask)
{
struct scan_control sc = {
.gfp_mask = gfp_mask,
@ -1694,6 +1701,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.order = order,
.mem_cgroup = NULL,
.isolate_pages = isolate_pages_global,
.nodemask = nodemask,
};
return do_try_to_free_pages(zonelist, &sc);
@ -1714,6 +1722,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
.order = 0,
.mem_cgroup = mem_cont,
.isolate_pages = mem_cgroup_isolate_pages,
.nodemask = NULL, /* we don't care the placement */
};
struct zonelist *zonelist;