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GFS2: Shrink the shrinker 

This patch removes some of the special cases that the shrinker
was trying to deal with. As a result we leave fewer items on
the list and none at all which cannot be demoted. This makes
the list scanning more efficient and solves some issues seen
with large numbers of inodes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2009-06-25 16:30:26 +01:00
parent 4be3bd7849
commit 2163b1e616
1 changed files with 5 additions and 18 deletions
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23
fs/gfs2/glock.c
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@ -1300,7 +1300,6 @@ static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
struct gfs2_glock *gl;
int may_demote;
int nr_skipped = 0;
int got_ref = 0;
LIST_HEAD(skipped);
if (nr == 0)
@ -1318,7 +1317,6 @@ static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
/* Test for being demotable */
if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
gfs2_glock_hold(gl);
got_ref = 1;
spin_unlock(&lru_lock);
spin_lock(&gl->gl_spin);
may_demote = demote_ok(gl);
@ -1327,25 +1325,14 @@ static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
if (may_demote) {
handle_callback(gl, LM_ST_UNLOCKED, 0);
nr--;
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
got_ref = 0;
}
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
spin_lock(&lru_lock);
if (may_demote)
continue;
}
if (list_empty(&gl->gl_lru) &&
(atomic_read(&gl->gl_ref) <= (2 + got_ref))) {
nr_skipped++;
list_add(&gl->gl_lru, &skipped);
}
if (got_ref) {
spin_unlock(&lru_lock);
gfs2_glock_put(gl);
spin_lock(&lru_lock);
got_ref = 0;
continue;
}
nr_skipped++;
list_add(&gl->gl_lru, &skipped);
}
list_splice(&skipped, &lru_list);
atomic_add(nr_skipped, &lru_count);