GFS2: Use generic list_lru for quota
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
parent
7d80823e1d
commit
2147dbfd05
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@ -420,11 +420,10 @@ enum {
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struct gfs2_quota_data {
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struct list_head qd_list;
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struct list_head qd_reclaim;
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struct lockref qd_lockref;
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struct kqid qd_id;
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struct lockref qd_lockref;
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struct list_head qd_lru;
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unsigned long qd_flags; /* QDF_... */
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s64 qd_change;
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@ -31,12 +31,6 @@
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struct workqueue_struct *gfs2_control_wq;
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static struct shrinker qd_shrinker = {
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.count_objects = gfs2_qd_shrink_count,
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.scan_objects = gfs2_qd_shrink_scan,
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.seeks = DEFAULT_SEEKS,
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};
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static void gfs2_init_inode_once(void *foo)
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{
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struct gfs2_inode *ip = foo;
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@ -87,6 +81,10 @@ static int __init init_gfs2_fs(void)
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if (error)
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return error;
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error = list_lru_init(&gfs2_qd_lru);
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if (error)
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goto fail_lru;
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error = gfs2_glock_init();
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if (error)
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goto fail;
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@ -139,7 +137,7 @@ static int __init init_gfs2_fs(void)
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if (!gfs2_rsrv_cachep)
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goto fail;
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register_shrinker(&qd_shrinker);
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register_shrinker(&gfs2_qd_shrinker);
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error = register_filesystem(&gfs2_fs_type);
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if (error)
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@ -179,7 +177,9 @@ fail_wq:
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fail_unregister:
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unregister_filesystem(&gfs2_fs_type);
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fail:
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unregister_shrinker(&qd_shrinker);
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list_lru_destroy(&gfs2_qd_lru);
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fail_lru:
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unregister_shrinker(&gfs2_qd_shrinker);
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gfs2_glock_exit();
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if (gfs2_rsrv_cachep)
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@ -214,13 +214,14 @@ fail:
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static void __exit exit_gfs2_fs(void)
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{
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unregister_shrinker(&qd_shrinker);
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unregister_shrinker(&gfs2_qd_shrinker);
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gfs2_glock_exit();
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gfs2_unregister_debugfs();
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unregister_filesystem(&gfs2_fs_type);
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unregister_filesystem(&gfs2meta_fs_type);
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destroy_workqueue(gfs_recovery_wq);
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destroy_workqueue(gfs2_control_wq);
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list_lru_destroy(&gfs2_qd_lru);
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rcu_barrier();
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118
fs/gfs2/quota.c
118
fs/gfs2/quota.c
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@ -51,6 +51,7 @@
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#include <linux/quota.h>
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#include <linux/dqblk_xfs.h>
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#include <linux/lockref.h>
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#include <linux/list_lru.h>
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#include "gfs2.h"
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#include "incore.h"
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@ -72,29 +73,25 @@ struct gfs2_quota_change_host {
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struct kqid qc_id;
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};
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static LIST_HEAD(qd_lru_list);
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static atomic_t qd_lru_count = ATOMIC_INIT(0);
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/* Lock order: qd_lock -> qd->lockref.lock -> lru lock */
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static DEFINE_SPINLOCK(qd_lock);
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struct list_lru gfs2_qd_lru;
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unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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static void gfs2_qd_dispose(struct list_head *list)
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{
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struct gfs2_quota_data *qd;
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struct gfs2_sbd *sdp;
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int nr_to_scan = sc->nr_to_scan;
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long freed = 0;
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if (!(sc->gfp_mask & __GFP_FS))
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return SHRINK_STOP;
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spin_lock(&qd_lock);
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while (nr_to_scan && !list_empty(&qd_lru_list)) {
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qd = list_entry(qd_lru_list.next,
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struct gfs2_quota_data, qd_reclaim);
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while (!list_empty(list)) {
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qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
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sdp = qd->qd_gl->gl_sbd;
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list_del(&qd->qd_lru);
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/* Free from the filesystem-specific list */
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spin_lock(&qd_lock);
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list_del(&qd->qd_list);
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spin_unlock(&qd_lock);
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gfs2_assert_warn(sdp, !qd->qd_change);
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gfs2_assert_warn(sdp, !qd->qd_slot_count);
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@ -104,24 +101,59 @@ unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
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atomic_dec(&sdp->sd_quota_count);
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/* Delete it from the common reclaim list */
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list_del_init(&qd->qd_reclaim);
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atomic_dec(&qd_lru_count);
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spin_unlock(&qd_lock);
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kmem_cache_free(gfs2_quotad_cachep, qd);
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spin_lock(&qd_lock);
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nr_to_scan--;
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freed++;
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}
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spin_unlock(&qd_lock);
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}
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static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
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{
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struct list_head *dispose = arg;
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struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
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if (!spin_trylock(&qd->qd_lockref.lock))
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return LRU_SKIP;
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if (qd->qd_lockref.count == 0) {
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lockref_mark_dead(&qd->qd_lockref);
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list_move(&qd->qd_lru, dispose);
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}
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spin_unlock(&qd->qd_lockref.lock);
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return LRU_REMOVED;
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}
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static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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LIST_HEAD(dispose);
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unsigned long freed;
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if (!(sc->gfp_mask & __GFP_FS))
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return SHRINK_STOP;
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freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
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&dispose, &sc->nr_to_scan);
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gfs2_qd_dispose(&dispose);
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return freed;
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}
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unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
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struct shrink_control *sc)
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static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
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struct shrink_control *sc)
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{
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return vfs_pressure_ratio(atomic_read(&qd_lru_count));
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return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
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}
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struct shrinker gfs2_qd_shrinker = {
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.count_objects = gfs2_qd_shrink_count,
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.scan_objects = gfs2_qd_shrink_scan,
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.seeks = DEFAULT_SEEKS,
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.flags = SHRINKER_NUMA_AWARE,
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};
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static u64 qd2index(struct gfs2_quota_data *qd)
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{
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struct kqid qid = qd->qd_id;
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@ -153,7 +185,7 @@ static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
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spin_lock_init(&qd->qd_lockref.lock);
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qd->qd_id = qid;
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qd->qd_slot = -1;
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INIT_LIST_HEAD(&qd->qd_reclaim);
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INIT_LIST_HEAD(&qd->qd_lru);
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error = gfs2_glock_get(sdp, qd2index(qd),
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&gfs2_quota_glops, CREATE, &qd->qd_gl);
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@ -181,13 +213,9 @@ static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
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found = 0;
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spin_lock(&qd_lock);
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list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
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if (qid_eq(qd->qd_id, qid)) {
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lockref_get(&qd->qd_lockref);
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if (!list_empty(&qd->qd_reclaim)) {
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/* Remove it from reclaim list */
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list_del_init(&qd->qd_reclaim);
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atomic_dec(&qd_lru_count);
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}
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if (qid_eq(qd->qd_id, qid) &&
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lockref_get_not_dead(&qd->qd_lockref)) {
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list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
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found = 1;
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break;
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}
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@ -229,18 +257,13 @@ static void qd_hold(struct gfs2_quota_data *qd)
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static void qd_put(struct gfs2_quota_data *qd)
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{
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spin_lock(&qd_lock);
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if (lockref_put_or_lock(&qd->qd_lockref))
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return;
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if (!lockref_put_or_lock(&qd->qd_lockref)) {
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qd->qd_lockref.count = 0;
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list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
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spin_unlock(&qd->qd_lockref.lock);
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/* Add to the reclaim list */
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list_add_tail(&qd->qd_reclaim, &qd_lru_list);
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atomic_inc(&qd_lru_count);
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spin_unlock(&qd->qd_lockref.lock);
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}
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spin_unlock(&qd_lock);
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}
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static int slot_get(struct gfs2_quota_data *qd)
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@ -398,11 +421,11 @@ static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
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(sync_gen && (qd->qd_sync_gen >= *sync_gen)))
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return 0;
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list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
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if (!lockref_get_not_dead(&qd->qd_lockref))
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return 0;
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list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
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set_bit(QDF_LOCKED, &qd->qd_flags);
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gfs2_assert_warn(sdp, !__lockref_is_dead(&qd->qd_lockref));
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lockref_get(&qd->qd_lockref);
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qd->qd_change_sync = qd->qd_change;
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gfs2_assert_warn(sdp, qd->qd_slot_count);
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qd->qd_slot_count++;
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@ -1329,10 +1352,7 @@ void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
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list_del(&qd->qd_list);
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/* Also remove if this qd exists in the reclaim list */
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if (!list_empty(&qd->qd_reclaim)) {
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list_del_init(&qd->qd_reclaim);
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atomic_dec(&qd_lru_count);
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}
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list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
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atomic_dec(&sdp->sd_quota_count);
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spin_unlock(&qd_lock);
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@ -1487,7 +1507,7 @@ static int gfs2_quota_get_xstate(struct super_block *sb,
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}
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fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
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fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
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fqs->qs_incoredqs = atomic_read(&qd_lru_count);
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fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
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return 0;
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}
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@ -10,9 +10,10 @@
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#ifndef __QUOTA_DOT_H__
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#define __QUOTA_DOT_H__
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#include <linux/list_lru.h>
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struct gfs2_inode;
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struct gfs2_sbd;
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struct shrink_control;
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#define NO_UID_QUOTA_CHANGE INVALID_UID
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#define NO_GID_QUOTA_CHANGE INVALID_GID
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@ -53,10 +54,8 @@ static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
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return ret;
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}
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extern unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
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struct shrink_control *sc);
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extern unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
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struct shrink_control *sc);
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extern const struct quotactl_ops gfs2_quotactl_ops;
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extern struct shrinker gfs2_qd_shrinker;
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extern struct list_lru gfs2_qd_lru;
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#endif /* __QUOTA_DOT_H__ */
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