diff options
author | Dave Chinner <dchinner@redhat.com> | 2013-08-28 10:18:07 +1000 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-09-10 18:56:31 -0400 |
commit | cd56a39a59868911bbf8832725630c1cf43a7b09 (patch) | |
tree | 1d110f7c0ee68db0dfa1ae37ecdf5c0cc304ceeb /fs/xfs/xfs_qm.c | |
parent | a408235726aa82c0358c9ec68124b6f4bc0a79df (diff) | |
download | linux-cd56a39a59868911bbf8832725630c1cf43a7b09.tar.bz2 |
xfs: convert dquot cache lru to list_lru
Convert the XFS dquot lru to use the list_lru construct and convert the
shrinker to being node aware.
[glommer@openvz.org: edited for conflicts + warning fixes]
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Glauber Costa <glommer@openvz.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/xfs/xfs_qm.c')
-rw-r--r-- | fs/xfs/xfs_qm.c | 277 |
1 files changed, 142 insertions, 135 deletions
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index 956da2e1c7af..0fa98753bf67 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -51,8 +51,9 @@ */ STATIC int xfs_qm_init_quotainos(xfs_mount_t *); STATIC int xfs_qm_init_quotainfo(xfs_mount_t *); -STATIC int xfs_qm_shake(struct shrinker *, struct shrink_control *); + +STATIC void xfs_qm_dqfree_one(struct xfs_dquot *dqp); /* * We use the batch lookup interface to iterate over the dquots as it * currently is the only interface into the radix tree code that allows @@ -203,12 +204,9 @@ xfs_qm_dqpurge( * We move dquots to the freelist as soon as their reference count * hits zero, so it really should be on the freelist here. */ - mutex_lock(&qi->qi_lru_lock); ASSERT(!list_empty(&dqp->q_lru)); - list_del_init(&dqp->q_lru); - qi->qi_lru_count--; + list_lru_del(&qi->qi_lru, &dqp->q_lru); XFS_STATS_DEC(xs_qm_dquot_unused); - mutex_unlock(&qi->qi_lru_lock); xfs_qm_dqdestroy(dqp); @@ -680,6 +678,141 @@ xfs_qm_calc_dquots_per_chunk( return ndquots; } +struct xfs_qm_isolate { + struct list_head buffers; + struct list_head dispose; +}; + +static enum lru_status +xfs_qm_dquot_isolate( + struct list_head *item, + spinlock_t *lru_lock, + void *arg) +{ + struct xfs_dquot *dqp = container_of(item, + struct xfs_dquot, q_lru); + struct xfs_qm_isolate *isol = arg; + + if (!xfs_dqlock_nowait(dqp)) + goto out_miss_busy; + + /* + * This dquot has acquired a reference in the meantime remove it from + * the freelist and try again. + */ + if (dqp->q_nrefs) { + xfs_dqunlock(dqp); + XFS_STATS_INC(xs_qm_dqwants); + + trace_xfs_dqreclaim_want(dqp); + list_del_init(&dqp->q_lru); + XFS_STATS_DEC(xs_qm_dquot_unused); + return 0; + } + + /* + * If the dquot is dirty, flush it. If it's already being flushed, just + * skip it so there is time for the IO to complete before we try to + * reclaim it again on the next LRU pass. + */ + if (!xfs_dqflock_nowait(dqp)) { + xfs_dqunlock(dqp); + goto out_miss_busy; + } + + if (XFS_DQ_IS_DIRTY(dqp)) { + struct xfs_buf *bp = NULL; + int error; + + trace_xfs_dqreclaim_dirty(dqp); + + /* we have to drop the LRU lock to flush the dquot */ + spin_unlock(lru_lock); + + error = xfs_qm_dqflush(dqp, &bp); + if (error) { + xfs_warn(dqp->q_mount, "%s: dquot %p flush failed", + __func__, dqp); + goto out_unlock_dirty; + } + + xfs_buf_delwri_queue(bp, &isol->buffers); + xfs_buf_relse(bp); + goto out_unlock_dirty; + } + xfs_dqfunlock(dqp); + + /* + * Prevent lookups now that we are past the point of no return. + */ + dqp->dq_flags |= XFS_DQ_FREEING; + xfs_dqunlock(dqp); + + ASSERT(dqp->q_nrefs == 0); + list_move_tail(&dqp->q_lru, &isol->dispose); + XFS_STATS_DEC(xs_qm_dquot_unused); + trace_xfs_dqreclaim_done(dqp); + XFS_STATS_INC(xs_qm_dqreclaims); + return 0; + +out_miss_busy: + trace_xfs_dqreclaim_busy(dqp); + XFS_STATS_INC(xs_qm_dqreclaim_misses); + return 2; + +out_unlock_dirty: + trace_xfs_dqreclaim_busy(dqp); + XFS_STATS_INC(xs_qm_dqreclaim_misses); + return 3; +} + +static long +xfs_qm_shrink_scan( + struct shrinker *shrink, + struct shrink_control *sc) +{ + struct xfs_quotainfo *qi = container_of(shrink, + struct xfs_quotainfo, qi_shrinker); + struct xfs_qm_isolate isol; + long freed; + int error; + unsigned long nr_to_scan = sc->nr_to_scan; + + if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT)) + return 0; + + INIT_LIST_HEAD(&isol.buffers); + INIT_LIST_HEAD(&isol.dispose); + + freed = list_lru_walk_node(&qi->qi_lru, sc->nid, xfs_qm_dquot_isolate, &isol, + &nr_to_scan); + + error = xfs_buf_delwri_submit(&isol.buffers); + if (error) + xfs_warn(NULL, "%s: dquot reclaim failed", __func__); + + while (!list_empty(&isol.dispose)) { + struct xfs_dquot *dqp; + + dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru); + list_del_init(&dqp->q_lru); + xfs_qm_dqfree_one(dqp); + } + + return freed; +} + +static long +xfs_qm_shrink_count( + struct shrinker *shrink, + struct shrink_control *sc) +{ + struct xfs_quotainfo *qi = container_of(shrink, + struct xfs_quotainfo, qi_shrinker); + + return list_lru_count_node(&qi->qi_lru, sc->nid); +} + /* * This initializes all the quota information that's kept in the * mount structure @@ -711,9 +844,7 @@ xfs_qm_init_quotainfo( INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS); mutex_init(&qinf->qi_tree_lock); - INIT_LIST_HEAD(&qinf->qi_lru_list); - qinf->qi_lru_count = 0; - mutex_init(&qinf->qi_lru_lock); + list_lru_init(&qinf->qi_lru); /* mutex used to serialize quotaoffs */ mutex_init(&qinf->qi_quotaofflock); @@ -779,8 +910,10 @@ xfs_qm_init_quotainfo( qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT; } - qinf->qi_shrinker.shrink = xfs_qm_shake; + qinf->qi_shrinker.count_objects = xfs_qm_shrink_count; + qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan; qinf->qi_shrinker.seeks = DEFAULT_SEEKS; + qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE; register_shrinker(&qinf->qi_shrinker); return 0; } @@ -1599,132 +1732,6 @@ xfs_qm_dqfree_one( xfs_qm_dqdestroy(dqp); } -STATIC void -xfs_qm_dqreclaim_one( - struct xfs_dquot *dqp, - struct list_head *buffer_list, - struct list_head *dispose_list) -{ - struct xfs_mount *mp = dqp->q_mount; - struct xfs_quotainfo *qi = mp->m_quotainfo; - int error; - - if (!xfs_dqlock_nowait(dqp)) - goto out_move_tail; - - /* - * This dquot has acquired a reference in the meantime remove it from - * the freelist and try again. - */ - if (dqp->q_nrefs) { - xfs_dqunlock(dqp); - - trace_xfs_dqreclaim_want(dqp); - XFS_STATS_INC(xs_qm_dqwants); - - list_del_init(&dqp->q_lru); - qi->qi_lru_count--; - XFS_STATS_DEC(xs_qm_dquot_unused); - return; - } - - /* - * Try to grab the flush lock. If this dquot is in the process of - * getting flushed to disk, we don't want to reclaim it. - */ - if (!xfs_dqflock_nowait(dqp)) - goto out_unlock_move_tail; - - if (XFS_DQ_IS_DIRTY(dqp)) { - struct xfs_buf *bp = NULL; - - trace_xfs_dqreclaim_dirty(dqp); - - error = xfs_qm_dqflush(dqp, &bp); - if (error) { - xfs_warn(mp, "%s: dquot %p flush failed", - __func__, dqp); - goto out_unlock_move_tail; - } - - xfs_buf_delwri_queue(bp, buffer_list); - xfs_buf_relse(bp); - /* - * Give the dquot another try on the freelist, as the - * flushing will take some time. - */ - goto out_unlock_move_tail; - } - xfs_dqfunlock(dqp); - - /* - * Prevent lookups now that we are past the point of no return. - */ - dqp->dq_flags |= XFS_DQ_FREEING; - xfs_dqunlock(dqp); - - ASSERT(dqp->q_nrefs == 0); - list_move_tail(&dqp->q_lru, dispose_list); - qi->qi_lru_count--; - XFS_STATS_DEC(xs_qm_dquot_unused); - - trace_xfs_dqreclaim_done(dqp); - XFS_STATS_INC(xs_qm_dqreclaims); - return; - - /* - * Move the dquot to the tail of the list so that we don't spin on it. - */ -out_unlock_move_tail: - xfs_dqunlock(dqp); -out_move_tail: - list_move_tail(&dqp->q_lru, &qi->qi_lru_list); - trace_xfs_dqreclaim_busy(dqp); - XFS_STATS_INC(xs_qm_dqreclaim_misses); -} - -STATIC int -xfs_qm_shake( - struct shrinker *shrink, - struct shrink_control *sc) -{ - struct xfs_quotainfo *qi = - container_of(shrink, struct xfs_quotainfo, qi_shrinker); - int nr_to_scan = sc->nr_to_scan; - LIST_HEAD (buffer_list); - LIST_HEAD (dispose_list); - struct xfs_dquot *dqp; - int error; - - if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT)) - return 0; - if (!nr_to_scan) - goto out; - - mutex_lock(&qi->qi_lru_lock); - while (!list_empty(&qi->qi_lru_list)) { - if (nr_to_scan-- <= 0) - break; - dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot, - q_lru); - xfs_qm_dqreclaim_one(dqp, &buffer_list, &dispose_list); - } - mutex_unlock(&qi->qi_lru_lock); - - error = xfs_buf_delwri_submit(&buffer_list); - if (error) - xfs_warn(NULL, "%s: dquot reclaim failed", __func__); - - while (!list_empty(&dispose_list)) { - dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru); - list_del_init(&dqp->q_lru); - xfs_qm_dqfree_one(dqp); - } - -out: - return vfs_pressure_ratio(qi->qi_lru_count); -} - /* * Start a transaction and write the incore superblock changes to * disk. flags parameter indicates which fields have changed. |