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| author | Dave Chinner <dchinner@redhat.com> | 2011-07-08 06:14:34 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-07-20 07:44:27 +0200 |
| commit | 095760730c1047c69159ce88021a7fa3833502c8 (patch) | |
| tree | 7cee34087a3e0d3d14691075b0ea614846c87d7c /mm/vmscan.c | |
| parent | make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) (diff) | |
| download | linux-095760730c1047c69159ce88021a7fa3833502c8.tar.xz linux-095760730c1047c69159ce88021a7fa3833502c8.zip | |
vmscan: add shrink_slab tracepoints
It is impossible to understand what the shrinkers are actually doing
without instrumenting the code, so add a some tracepoints to allow
insight to be gained.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index d036e59d302b..255226554a3d 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -250,6 +250,7 @@ unsigned long shrink_slab(struct shrink_control *shrink, unsigned long long delta; unsigned long total_scan; unsigned long max_pass; + int shrink_ret = 0; max_pass = do_shrinker_shrink(shrinker, shrink, 0); delta = (4 * nr_pages_scanned) / shrinker->seeks; @@ -274,9 +275,12 @@ unsigned long shrink_slab(struct shrink_control *shrink, total_scan = shrinker->nr; shrinker->nr = 0; + trace_mm_shrink_slab_start(shrinker, shrink, total_scan, + nr_pages_scanned, lru_pages, + max_pass, delta, total_scan); + while (total_scan >= SHRINK_BATCH) { long this_scan = SHRINK_BATCH; - int shrink_ret; int nr_before; nr_before = do_shrinker_shrink(shrinker, shrink, 0); @@ -293,6 +297,8 @@ unsigned long shrink_slab(struct shrink_control *shrink, } shrinker->nr += total_scan; + trace_mm_shrink_slab_end(shrinker, shrink_ret, total_scan, + shrinker->nr); } up_read(&shrinker_rwsem); out: |