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vmscan: separate sc.swap_cluster_max and sc.nr_max_reclaim 

Currently, sc.scap_cluster_max has double meanings.

 1) reclaim batch size as isolate_lru_pages()'s argument
 2) reclaim baling out thresolds

The two meanings pretty unrelated. Thus, Let's separate it.
this patch doesn't change any behavior.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2009-12-14 17:59:10 -08:00 committed by Linus Torvalds
parent cba5dd7fa5
commit 22fba33545
1 changed files with 19 additions and 6 deletions
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25
mm/vmscan.c
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@ -55,6 +55,9 @@ struct scan_control {
/* Number of pages freed so far during a call to shrink_zones() */
unsigned long nr_reclaimed;
/* How many pages shrink_list() should reclaim */
unsigned long nr_to_reclaim;
/* This context's GFP mask */
gfp_t gfp_mask;
@ -1595,6 +1598,7 @@ static void shrink_zone(int priority, struct zone *zone,
enum lru_list l;
unsigned long nr_reclaimed = sc->nr_reclaimed;
unsigned long swap_cluster_max = sc->swap_cluster_max;
unsigned long nr_to_reclaim = sc->nr_to_reclaim;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
int noswap = 0;
@ -1639,8 +1643,7 @@ static void shrink_zone(int priority, struct zone *zone,
* with multiple processes reclaiming pages, the total
* freeing target can get unreasonably large.
*/
if (nr_reclaimed > swap_cluster_max &&
priority < DEF_PRIORITY && !current_is_kswapd())
if (nr_reclaimed > nr_to_reclaim && priority < DEF_PRIORITY)
break;
}
@ -1738,6 +1741,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
struct zoneref *z;
struct zone *zone;
enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask);
unsigned long writeback_threshold;
delayacct_freepages_start();
@ -1773,7 +1777,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
}
}
total_scanned += sc->nr_scanned;
if (sc->nr_reclaimed >= sc->swap_cluster_max) {
if (sc->nr_reclaimed >= sc->nr_to_reclaim) {
ret = sc->nr_reclaimed;
goto out;
}
@ -1785,8 +1789,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
* that's undesirable in laptop mode, where we *want* lumpy
* writeout. So in laptop mode, write out the whole world.
*/
if (total_scanned > sc->swap_cluster_max +
sc->swap_cluster_max / 2) {
writeback_threshold = sc->nr_to_reclaim + sc->nr_to_reclaim / 2;
if (total_scanned > writeback_threshold) {
wakeup_flusher_threads(laptop_mode ? 0 : total_scanned);
sc->may_writepage = 1;
}
@ -1832,6 +1836,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
.swap_cluster_max = SWAP_CLUSTER_MAX,
.nr_to_reclaim = SWAP_CLUSTER_MAX,
.may_unmap = 1,
.may_swap = 1,
.swappiness = vm_swappiness,
@ -1890,6 +1895,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
.may_unmap = 1,
.may_swap = !noswap,
.swap_cluster_max = SWAP_CLUSTER_MAX,
.nr_to_reclaim = SWAP_CLUSTER_MAX,
.swappiness = swappiness,
.order = 0,
.mem_cgroup = mem_cont,
@ -1961,6 +1967,11 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
.may_unmap = 1,
.may_swap = 1,
.swap_cluster_max = SWAP_CLUSTER_MAX,
/*
* kswapd doesn't want to be bailed out while reclaim. because
* we want to put equal scanning pressure on each zone.
*/
.nr_to_reclaim = ULONG_MAX,
.swappiness = vm_swappiness,
.order = order,
.mem_cgroup = NULL,
@ -2630,7 +2641,9 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
.may_unmap = !!(zone_reclaim_mode & RECLAIM_SWAP),
.may_swap = 1,
.swap_cluster_max = max_t(unsigned long, nr_pages,
SWAP_CLUSTER_MAX),
SWAP_CLUSTER_MAX),
.nr_to_reclaim = max_t(unsigned long, nr_pages,
SWAP_CLUSTER_MAX),
.gfp_mask = gfp_mask,
.swappiness = vm_swappiness,
.order = order,