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GFS2: Use generic list_lru for quota

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By using the generic list_lru code, we can now separate the
per sb quota list locking from the lru locking. The lru
lock is made into the inner-most lock.

As a result of this new lock order, we may occasionally see
items on the per-sb quota list which are "dead" so that the
two places where we traverse that list are updated to take
account of that.

As a result of this patch, the gfs2 quota shrinker is now
NUMA zone aware, and we are also laying the foundations for
further improvments in due course.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Abhijith Das <adas@redhat.com>
Tested-by: Abhijith Das <adas@redhat.com>
Cc: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Steven Whitehouse
2013-11-04 10:15:08 +00:00
parent 7d80823e1d
commit 2147dbfd05
4 changed files with 86 additions and 67 deletions
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19
fs/gfs2/main.c
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@@ -31,12 +31,6 @@
struct workqueue_struct *gfs2_control_wq;
static struct shrinker qd_shrinker = {
.count_objects = gfs2_qd_shrink_count,
.scan_objects = gfs2_qd_shrink_scan,
.seeks = DEFAULT_SEEKS,
};
static void gfs2_init_inode_once(void *foo)
{
struct gfs2_inode *ip = foo;
@@ -87,6 +81,10 @@ static int __init init_gfs2_fs(void)
if (error)
return error;
error = list_lru_init(&gfs2_qd_lru);
if (error)
goto fail_lru;
error = gfs2_glock_init();
if (error)
goto fail;
@@ -139,7 +137,7 @@ static int __init init_gfs2_fs(void)
if (!gfs2_rsrv_cachep)
goto fail;
register_shrinker(&qd_shrinker);
register_shrinker(&gfs2_qd_shrinker);
error = register_filesystem(&gfs2_fs_type);
if (error)
@@ -179,7 +177,9 @@ fail_wq:
fail_unregister:
unregister_filesystem(&gfs2_fs_type);
fail:
unregister_shrinker(&qd_shrinker);
list_lru_destroy(&gfs2_qd_lru);
fail_lru:
unregister_shrinker(&gfs2_qd_shrinker);
gfs2_glock_exit();
if (gfs2_rsrv_cachep)
@@ -214,13 +214,14 @@ fail:
static void __exit exit_gfs2_fs(void)
{
unregister_shrinker(&qd_shrinker);
unregister_shrinker(&gfs2_qd_shrinker);
gfs2_glock_exit();
gfs2_unregister_debugfs();
unregister_filesystem(&gfs2_fs_type);
unregister_filesystem(&gfs2meta_fs_type);
destroy_workqueue(gfs_recovery_wq);
destroy_workqueue(gfs2_control_wq);
list_lru_destroy(&gfs2_qd_lru);
rcu_barrier();