From: Trond Myklebust <trondmy@gmail.com>
To: linux-nfs@vger.kernel.org
Subject: [PATCH 6/7] NFSv4: Convert open state lookup to use RCU
Date: Wed, 5 Sep 2018 15:23:59 -0400 [thread overview]
Message-ID: <20180905192400.107485-7-trond.myklebust@hammerspace.com> (raw)
In-Reply-To: <20180905192400.107485-6-trond.myklebust@hammerspace.com>
Further reduce contention on the inode->i_lock.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/nfs4_fs.h | 1 +
fs/nfs/nfs4state.c | 12 ++++++------
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 3a6904173214..1b4737f4cac4 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -191,6 +191,7 @@ struct nfs4_state {
atomic_t count;
wait_queue_head_t waitq;
+ struct rcu_head rcu_head;
};
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index be92ce4259e9..7feac365038c 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -684,7 +684,7 @@ __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs4_state *state;
- list_for_each_entry(state, &nfsi->open_states, inode_states) {
+ list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
if (state->owner != owner)
continue;
if (!nfs4_valid_open_stateid(state))
@@ -698,7 +698,7 @@ __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
static void
nfs4_free_open_state(struct nfs4_state *state)
{
- kfree(state);
+ kfree_rcu(state, rcu_head);
}
struct nfs4_state *
@@ -707,9 +707,9 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
struct nfs4_state *state, *new;
struct nfs_inode *nfsi = NFS_I(inode);
- spin_lock(&inode->i_lock);
+ rcu_read_lock();
state = __nfs4_find_state_byowner(inode, owner);
- spin_unlock(&inode->i_lock);
+ rcu_read_unlock();
if (state)
goto out;
new = nfs4_alloc_open_state();
@@ -720,7 +720,7 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
state = new;
state->owner = owner;
atomic_inc(&owner->so_count);
- list_add(&state->inode_states, &nfsi->open_states);
+ list_add_rcu(&state->inode_states, &nfsi->open_states);
ihold(inode);
state->inode = inode;
spin_unlock(&inode->i_lock);
@@ -746,7 +746,7 @@ void nfs4_put_open_state(struct nfs4_state *state)
if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
return;
spin_lock(&inode->i_lock);
- list_del(&state->inode_states);
+ list_del_rcu(&state->inode_states);
list_del(&state->open_states);
spin_unlock(&inode->i_lock);
spin_unlock(&owner->so_lock);
--
2.17.1
next prev parent reply other threads:[~2018-09-05 23:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 19:23 [PATCH 0/7] Misc NFS + pNFS performance enhancements Trond Myklebust
2018-09-05 19:23 ` [PATCH 1/7] pNFS: Don't zero out the array in nfs4_alloc_pages() Trond Myklebust
2018-09-05 19:23 ` [PATCH 2/7] pNFS: Don't allocate more pages than we need to fit a layoutget response Trond Myklebust
2018-09-05 19:23 ` [PATCH 3/7] NFS: Convert lookups of the lock context to RCU Trond Myklebust
2018-09-05 19:23 ` [PATCH 4/7] NFS: Simplify internal check for whether file is open for write Trond Myklebust
2018-09-05 19:23 ` [PATCH 5/7] NFS: Convert lookups of the open context to RCU Trond Myklebust
2018-09-05 19:23 ` Trond Myklebust [this message]
2018-09-05 19:24 ` [PATCH 7/7] NFSv4: Convert struct nfs4_state to use refcount_t Trond Myklebust
2018-09-28 16:34 ` [PATCH 5/7] NFS: Convert lookups of the open context to RCU Olga Kornievskaia
2018-09-28 16:54 ` Olga Kornievskaia
2018-09-28 17:49 ` Trond Myklebust
2018-09-28 18:31 ` Olga Kornievskaia
2018-09-28 18:53 ` Trond Myklebust
2018-09-28 19:10 ` Olga Kornievskaia
2018-09-28 19:55 ` Olga Kornievskaia
2018-09-28 20:07 ` Trond Myklebust
2018-09-28 20:19 ` Olga Kornievskaia
2018-09-28 20:38 ` Trond Myklebust
2018-10-03 18:38 ` Olga Kornievskaia
2018-10-04 15:22 ` Trond Myklebust
2018-10-04 15:49 ` Olga Kornievskaia
2018-10-04 16:13 ` Trond Myklebust
2018-10-04 16:31 ` Olga Kornievskaia
2018-10-04 16:42 ` Trond Myklebust
2018-10-04 18:51 ` Olga Kornievskaia
2018-10-03 22:05 ` [PATCH 2/7] pNFS: Don't allocate more pages than we need to fit a layoutget response NeilBrown
2018-09-05 19:33 ` [PATCH 0/7] Misc NFS + pNFS performance enhancements Chuck Lever
2018-09-05 20:36 ` Trond Myklebust
2018-09-07 15:44 ` Chuck Lever
2018-09-10 1:35 ` Trond Myklebust
2018-09-10 16:14 ` Chuck Lever
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