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per-zone and reclaim enhancements for memory controller: add scan_global_lru macro

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This is used to detect which scan_control scans global lru or mem_cgroup lru.
And compiled to be static value (1) when memory controller is not configured.
This may make the meaning obvious.

Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Paul Menage <menage@google.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.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 2008-02-07 00:14:29 -08:00 committed by Linus Torvalds
parent df878fb04d
commit 91a45470f7
1 changed files with 12 additions and 5 deletions
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11
mm/vmscan.c
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@ -126,6 +126,12 @@ long vm_total_pages; /* The total number of pages which the VM controls */
static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
#ifdef CONFIG_CGROUP_MEM_CONT
#define scan_global_lru(sc) (!(sc)->mem_cgroup)
#else
#define scan_global_lru(sc) (1)
#endif
/*
* Add a shrinker callback to be called from the vm
*/
@ -1280,12 +1286,13 @@ static unsigned long do_try_to_free_pages(struct zone **zones, gfp_t gfp_mask,
* Don't shrink slabs when reclaiming memory from
* over limit cgroups
*/
if (sc->mem_cgroup == NULL)
if (scan_global_lru(sc)) {
shrink_slab(sc->nr_scanned, gfp_mask, lru_pages);
if (reclaim_state) {
nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
}
total_scanned += sc->nr_scanned;
if (nr_reclaimed >= sc->swap_cluster_max) {
ret = 1;
@ -1311,7 +1318,7 @@ static unsigned long do_try_to_free_pages(struct zone **zones, gfp_t gfp_mask,
congestion_wait(WRITE, HZ/10);
}
/* top priority shrink_caches still had more to do? don't OOM, then */
if (!sc->all_unreclaimable && sc->mem_cgroup == NULL)
if (!sc->all_unreclaimable && scan_global_lru(sc))
ret = 1;
out:
/*