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| author | Steven Whitehouse <swhiteho@redhat.com> | 2012-12-14 13:28:30 +0100 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2013-01-29 11:27:28 +0100 |
| commit | 2a005855938235771b6960206d7581a4933cf6b7 (patch) | |
| tree | 5868618caf3e160222e28d0aedc6ef5a45917468 /fs/gfs2/glock.c | |
| parent | Merge tag 'regulator-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| download | linux-2a005855938235771b6960206d7581a4933cf6b7.tar.xz linux-2a005855938235771b6960206d7581a4933cf6b7.zip | |
GFS2: Separate LRU scanning from shrinker
This breaks out the LRU scanning function from the shrinker in
preparation for adding other callers to the LRU scanner.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
| -rw-r--r-- | fs/gfs2/glock.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 992c5c0cb504..3ad8fd36f8da 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1376,23 +1376,19 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret) gfs2_glock_put(gl); } +/** + * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote + * @nr: The number of entries to scan + * + */ -static int gfs2_shrink_glock_memory(struct shrinker *shrink, - struct shrink_control *sc) +static void gfs2_scan_glock_lru(int nr) { struct gfs2_glock *gl; int may_demote; int nr_skipped = 0; - int nr = sc->nr_to_scan; - gfp_t gfp_mask = sc->gfp_mask; LIST_HEAD(skipped); - if (nr == 0) - goto out; - - if (!(gfp_mask & __GFP_FS)) - return -1; - spin_lock(&lru_lock); while(nr && !list_empty(&lru_list)) { gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru); @@ -1425,7 +1421,17 @@ static int gfs2_shrink_glock_memory(struct shrinker *shrink, list_splice(&skipped, &lru_list); atomic_add(nr_skipped, &lru_count); spin_unlock(&lru_lock); -out: +} + +static int gfs2_shrink_glock_memory(struct shrinker *shrink, + struct shrink_control *sc) +{ + if (sc->nr_to_scan) { + if (!(sc->gfp_mask & __GFP_FS)) + return -1; + gfs2_scan_glock_lru(sc->nr_to_scan); + } + return (atomic_read(&lru_count) / 100) * sysctl_vfs_cache_pressure; } |