The patch titled
knfsd: use new lock for svc_sock deferred list
has been added to the -mm tree. Its filename is
knfsd-use-new-lock-for-svc_sock-deferred-list.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: knfsd: use new lock for svc_sock deferred list
From: Greg Banks <gnb@xxxxxxxxxxxxxxxxx>
Protect the svc_sock->sk_deferred list with a new lock svc_sock->sk_defer_lock
instead of svc_serv->sv_lock. Using the more fine-grained lock reduces the
number of places we need to take the svc_serv lock.
Signed-off-by: Greg Banks <gnb@xxxxxxxxxxxxxxxxx>
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/sunrpc/svcsock.h | 1 +
net/sunrpc/svcsock.c | 12 ++++++------
2 files changed, 7 insertions(+), 6 deletions(-)
diff -puN include/linux/sunrpc/svcsock.h~knfsd-use-new-lock-for-svc_sock-deferred-list include/linux/sunrpc/svcsock.h
--- a/include/linux/sunrpc/svcsock.h~knfsd-use-new-lock-for-svc_sock-deferred-list
+++ a/include/linux/sunrpc/svcsock.h
@@ -36,6 +36,7 @@ struct svc_sock {
int sk_reserved; /* space on outq that is reserved */
+ spinlock_t sk_defer_lock; /* protects sk_deferred */
struct list_head sk_deferred; /* deferred requests that need to
* be revisted */
struct mutex sk_mutex; /* to serialize sending data */
diff -puN net/sunrpc/svcsock.c~knfsd-use-new-lock-for-svc_sock-deferred-list net/sunrpc/svcsock.c
--- a/net/sunrpc/svcsock.c~knfsd-use-new-lock-for-svc_sock-deferred-list
+++ a/net/sunrpc/svcsock.c
@@ -47,6 +47,7 @@
/* SMP locking strategy:
*
* svc_serv->sv_lock protects most stuff for that service.
+ * svc_sock->sk_defer_lock protects the svc_sock->sk_deferred list
*
* Some flags can be set to certain values at any time
* providing that certain rules are followed:
@@ -1426,6 +1427,7 @@ svc_setup_socket(struct svc_serv *serv,
svsk->sk_server = serv;
atomic_set(&svsk->sk_inuse, 0);
svsk->sk_lastrecv = get_seconds();
+ spin_lock_init(&svsk->sk_defer_lock);
INIT_LIST_HEAD(&svsk->sk_deferred);
INIT_LIST_HEAD(&svsk->sk_ready);
mutex_init(&svsk->sk_mutex);
@@ -1606,7 +1608,6 @@ svc_makesock(struct svc_serv *serv, int
static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
{
struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle);
- struct svc_serv *serv = dreq->owner;
struct svc_sock *svsk;
if (too_many) {
@@ -1617,9 +1618,9 @@ static void svc_revisit(struct cache_def
dprintk("revisit queued\n");
svsk = dr->svsk;
dr->svsk = NULL;
- spin_lock_bh(&serv->sv_lock);
+ spin_lock_bh(&svsk->sk_defer_lock);
list_add(&dr->handle.recent, &svsk->sk_deferred);
- spin_unlock_bh(&serv->sv_lock);
+ spin_unlock_bh(&svsk->sk_defer_lock);
set_bit(SK_DEFERRED, &svsk->sk_flags);
svc_sock_enqueue(svsk);
svc_sock_put(svsk);
@@ -1679,11 +1680,10 @@ static int svc_deferred_recv(struct svc_
static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk)
{
struct svc_deferred_req *dr = NULL;
- struct svc_serv *serv = svsk->sk_server;
if (!test_bit(SK_DEFERRED, &svsk->sk_flags))
return NULL;
- spin_lock_bh(&serv->sv_lock);
+ spin_lock_bh(&svsk->sk_defer_lock);
clear_bit(SK_DEFERRED, &svsk->sk_flags);
if (!list_empty(&svsk->sk_deferred)) {
dr = list_entry(svsk->sk_deferred.next,
@@ -1692,6 +1692,6 @@ static struct svc_deferred_req *svc_defe
list_del_init(&dr->handle.recent);
set_bit(SK_DEFERRED, &svsk->sk_flags);
}
- spin_unlock_bh(&serv->sv_lock);
+ spin_unlock_bh(&svsk->sk_defer_lock);
return dr;
}
_
Patches currently in -mm which might be from gnb@xxxxxxxxxxxxxxxxx are
knfsd-knfsd-add-some-missing-newlines-in-printks.patch
knfsd-knfsd-remove-an-unused-variable-from-e_show.patch
knfsd-knfsd-remove-an-unused-variable-from-auth_unix_lookup.patch
knfsd-use-seq_start_token-instead-of-hardcoded-magic-void1.patch
knfsd-move-tempsock-aging-to-a-timer.patch
knfsd-move-tempsock-aging-to-a-timer-tidy.patch
knfsd-convert-sk_inuse-to-atomic_t.patch
knfsd-use-new-lock-for-svc_sock-deferred-list.patch
knfsd-convert-sk_reserved-to-atomic_t.patch
knfsd-test-and-set-sk_busy-atomically.patch
knfsd-split-svc_serv-into-pools.patch
knfsd-add-svc_get.patch
knfsd-add-svc_set_num_threads.patch
knfsd-use-svc_set_num_threads-to-manage-threads-in-knfsd.patch
knfsd-make-rpc-threads-pools-numa-aware.patch
knfsd-allow-admin-to-set-nthreads-per-node.patch
-
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