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author | Pekka Enberg <penberg@kernel.org> | 2012-01-11 23:11:29 +0400 |
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committer | Pekka Enberg <penberg@kernel.org> | 2012-01-11 23:11:29 +0400 |
commit | 5878cf431ca7233a56819ca6970153ac0b129599 (patch) | |
tree | e5d21d04a0b468d2dabbe3a3824f23b5537fc6a7 /mm/vmscan.c | |
parent | 74ee4ef1f901fbb014bdcdc9171d126490ce2b62 (diff) | |
parent | b13683d1cc14d1dd30b8e20f3ebea3f814ad029f (diff) | |
download | linux-5878cf431ca7233a56819ca6970153ac0b129599.tar.xz |
Merge branch 'slab/urgent' into slab/for-linus
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r-- | mm/vmscan.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index a1893c050795..f54a05b7a61d 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -183,7 +183,7 @@ static unsigned long zone_nr_lru_pages(struct zone *zone, */ void register_shrinker(struct shrinker *shrinker) { - shrinker->nr = 0; + atomic_long_set(&shrinker->nr_in_batch, 0); down_write(&shrinker_rwsem); list_add_tail(&shrinker->list, &shrinker_list); up_write(&shrinker_rwsem); @@ -247,25 +247,26 @@ unsigned long shrink_slab(struct shrink_control *shrink, list_for_each_entry(shrinker, &shrinker_list, list) { unsigned long long delta; - unsigned long total_scan; - unsigned long max_pass; + long total_scan; + long max_pass; int shrink_ret = 0; long nr; long new_nr; long batch_size = shrinker->batch ? shrinker->batch : SHRINK_BATCH; + max_pass = do_shrinker_shrink(shrinker, shrink, 0); + if (max_pass <= 0) + continue; + /* * copy the current shrinker scan count into a local variable * and zero it so that other concurrent shrinker invocations * don't also do this scanning work. */ - do { - nr = shrinker->nr; - } while (cmpxchg(&shrinker->nr, nr, 0) != nr); + nr = atomic_long_xchg(&shrinker->nr_in_batch, 0); total_scan = nr; - max_pass = do_shrinker_shrink(shrinker, shrink, 0); delta = (4 * nr_pages_scanned) / shrinker->seeks; delta *= max_pass; do_div(delta, lru_pages + 1); @@ -325,12 +326,11 @@ unsigned long shrink_slab(struct shrink_control *shrink, * manner that handles concurrent updates. If we exhausted the * scan, there is no need to do an update. */ - do { - nr = shrinker->nr; - new_nr = total_scan + nr; - if (total_scan <= 0) - break; - } while (cmpxchg(&shrinker->nr, nr, new_nr) != nr); + if (total_scan > 0) + new_nr = atomic_long_add_return(total_scan, + &shrinker->nr_in_batch); + else + new_nr = atomic_long_read(&shrinker->nr_in_batch); trace_mm_shrink_slab_end(shrinker, shrink_ret, nr, new_nr); } |