diff options
| author | David Rientjes <rientjes@google.com> | 2007-10-16 23:25:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:45 -0700 |
| commit | e815af95f94914993bbad279c71cf5fef9f4eaac (patch) | |
| tree | 492e0d3e8d3303f37cf9fb0beecf952a1c828c53 /mm/vmscan.c | |
| parent | 70e24bdf6d2fead14631e72a07fba012400c521e (diff) | |
oom: change all_unreclaimable zone member to flags
Convert the int all_unreclaimable member of struct zone to unsigned long
flags. This can now be used to specify several different zone flags such as
all_unreclaimable and reclaim_in_progress, which can now be removed and
converted to a per-zone flag.
Flags are set and cleared as follows:
zone_set_flag(struct zone *zone, zone_flags_t flag)
zone_clear_flag(struct zone *zone, zone_flags_t flag)
Defines the first zone flags, ZONE_ALL_UNRECLAIMABLE and ZONE_RECLAIM_LOCKED,
which have the same semantics as the old zone->all_unreclaimable and
zone->reclaim_in_progress, respectively. Also converts all current users that
set or clear either flag to use the new interface.
Helper functions are defined to test the flags:
int zone_is_all_unreclaimable(const struct zone *zone)
int zone_is_reclaim_locked(const struct zone *zone)
All flag operators are of the atomic variety because there are currently
readers that are implemented that do not take zone->lock.
[akpm@linux-foundation.org: add needed include]
Cc: Andrea Arcangeli <andrea@suse.de>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index bbd194630c5..d8893dc2d4e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1108,7 +1108,7 @@ static unsigned long shrink_zone(int priority, struct zone *zone, unsigned long nr_to_scan; unsigned long nr_reclaimed = 0; - atomic_inc(&zone->reclaim_in_progress); + zone_set_flag(zone, ZONE_RECLAIM_LOCKED); /* * Add one to `nr_to_scan' just to make sure that the kernel will @@ -1149,7 +1149,7 @@ static unsigned long shrink_zone(int priority, struct zone *zone, throttle_vm_writeout(sc->gfp_mask); - atomic_dec(&zone->reclaim_in_progress); + zone_clear_flag(zone, ZONE_RECLAIM_LOCKED); return nr_reclaimed; } @@ -1187,7 +1187,7 @@ static unsigned long shrink_zones(int priority, struct zone **zones, note_zone_scanning_priority(zone, priority); - if (zone->all_unreclaimable && priority != DEF_PRIORITY) + if (zone_is_all_unreclaimable(zone) && priority != DEF_PRIORITY) continue; /* Let kswapd poll it */ sc->all_unreclaimable = 0; @@ -1368,7 +1368,8 @@ loop_again: if (!populated_zone(zone)) continue; - if (zone->all_unreclaimable && priority != DEF_PRIORITY) + if (zone_is_all_unreclaimable(zone) && + priority != DEF_PRIORITY) continue; if (!zone_watermark_ok(zone, order, zone->pages_high, @@ -1403,7 +1404,8 @@ loop_again: if (!populated_zone(zone)) continue; - if (zone->all_unreclaimable && priority != DEF_PRIORITY) + if (zone_is_all_unreclaimable(zone) && + priority != DEF_PRIORITY) continue; if (!zone_watermark_ok(zone, order, zone->pages_high, @@ -1424,12 +1426,13 @@ loop_again: lru_pages); nr_reclaimed += reclaim_state->reclaimed_slab; total_scanned += sc.nr_scanned; - if (zone->all_unreclaimable) + if (zone_is_all_unreclaimable(zone)) continue; if (nr_slab == 0 && zone->pages_scanned >= (zone_page_state(zone, NR_ACTIVE) + zone_page_state(zone, NR_INACTIVE)) * 6) - zone->all_unreclaimable = 1; + zone_set_flag(zone, + ZONE_ALL_UNRECLAIMABLE); /* * If we've done a decent amount of scanning and * the reclaim ratio is low, start doing writepage @@ -1595,7 +1598,7 @@ static unsigned long shrink_all_zones(unsigned long nr_pages, int prio, if (!populated_zone(zone)) continue; - if (zone->all_unreclaimable && prio != DEF_PRIORITY) + if (zone_is_all_unreclaimable(zone) && prio != DEF_PRIORITY) continue; /* For pass = 0 we don't shrink the active list */ @@ -1919,10 +1922,8 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order) * not have reclaimable pages and if we should not delay the allocation * then do not scan. */ - if (!(gfp_mask & __GFP_WAIT) || - zone->all_unreclaimable || - atomic_read(&zone->reclaim_in_progress) > 0 || - (current->flags & PF_MEMALLOC)) + if (!(gfp_mask & __GFP_WAIT) || zone_is_all_unreclaimable(zone) || + zone_is_reclaim_locked(zone) || (current->flags & PF_MEMALLOC)) return 0; /* |