From 1ab36c9dfa0116a522410117eda159e6bc97c407 Mon Sep 17 00:00:00 2001 From: Xiubo Li Date: Wed, 23 Feb 2022 09:20:42 +0800 Subject: ceph: allocate capsnap memory outside of ceph_queue_cap_snap() This will reduce very possible but unnecessary frequently memory allocate/free in this loop. URL: https://tracker.ceph.com/issues/44100 Signed-off-by: Xiubo Li Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov --- fs/ceph/snap.c | 46 ++++++++++++++++++++++++++++------------------ 1 file changed, 28 insertions(+), 18 deletions(-) (limited to 'fs/ceph') diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index cc9097c27052..b75dcc9a36b6 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -522,23 +522,15 @@ static bool has_new_snaps(struct ceph_snap_context *o, * Caller must hold snap_rwsem for read (i.e., the realm topology won't * change). */ -static void ceph_queue_cap_snap(struct ceph_inode_info *ci) +static void ceph_queue_cap_snap(struct ceph_inode_info *ci, + struct ceph_cap_snap **pcapsnap) { struct inode *inode = &ci->vfs_inode; - struct ceph_cap_snap *capsnap; struct ceph_snap_context *old_snapc, *new_snapc; + struct ceph_cap_snap *capsnap = *pcapsnap; struct ceph_buffer *old_blob = NULL; int used, dirty; - capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS); - if (!capsnap) { - pr_err("ENOMEM allocating ceph_cap_snap on %p\n", inode); - return; - } - capsnap->cap_flush.is_capsnap = true; - INIT_LIST_HEAD(&capsnap->cap_flush.i_list); - INIT_LIST_HEAD(&capsnap->cap_flush.g_list); - spin_lock(&ci->i_ceph_lock); used = __ceph_caps_used(ci); dirty = __ceph_caps_dirty(ci); @@ -595,9 +587,6 @@ static void ceph_queue_cap_snap(struct ceph_inode_info *ci) capsnap->need_flush ? "" : "no_flush"); ihold(inode); - refcount_set(&capsnap->nref, 1); - INIT_LIST_HEAD(&capsnap->ci_item); - capsnap->follows = old_snapc->seq; capsnap->issued = __ceph_caps_issued(ci, NULL); capsnap->dirty = dirty; @@ -635,7 +624,7 @@ static void ceph_queue_cap_snap(struct ceph_inode_info *ci) /* note mtime, size NOW. */ __ceph_finish_cap_snap(ci, capsnap); } - capsnap = NULL; + *pcapsnap = NULL; old_snapc = NULL; update_snapc: @@ -651,8 +640,6 @@ update_snapc: spin_unlock(&ci->i_ceph_lock); ceph_buffer_put(old_blob); - if (capsnap) - kmem_cache_free(ceph_cap_snap_cachep, capsnap); ceph_put_snap_context(old_snapc); } @@ -720,6 +707,7 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) { struct ceph_inode_info *ci; struct inode *lastinode = NULL; + struct ceph_cap_snap *capsnap = NULL; dout("queue_realm_cap_snaps %p %llx inodes\n", realm, realm->ino); @@ -731,12 +719,34 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) spin_unlock(&realm->inodes_with_caps_lock); iput(lastinode); lastinode = inode; - ceph_queue_cap_snap(ci); + + /* + * Allocate the capsnap memory outside of ceph_queue_cap_snap() + * to reduce very possible but unnecessary frequently memory + * allocate/free in this loop. + */ + if (!capsnap) { + capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS); + if (!capsnap) { + pr_err("ENOMEM allocating ceph_cap_snap on %p\n", + inode); + return; + } + } + capsnap->cap_flush.is_capsnap = true; + refcount_set(&capsnap->nref, 1); + INIT_LIST_HEAD(&capsnap->cap_flush.i_list); + INIT_LIST_HEAD(&capsnap->cap_flush.g_list); + INIT_LIST_HEAD(&capsnap->ci_item); + + ceph_queue_cap_snap(ci, &capsnap); spin_lock(&realm->inodes_with_caps_lock); } spin_unlock(&realm->inodes_with_caps_lock); iput(lastinode); + if (capsnap) + kmem_cache_free(ceph_cap_snap_cachep, capsnap); dout("queue_realm_cap_snaps %p %llx done\n", realm, realm->ino); } -- cgit v1.2.3