Messages in this thread Patches in this message | | | From | NeilBrown <> | Date | Mon, 31 Jul 2006 10:41:58 +1000 | Subject | [PATCH 003 of 11] knfsd: use new lock for svc_sock deferred list |
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From: Greg Banks <gnb@melbourne.sgi.com>
knfsd: 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@melbourne.sgi.com> Signed-off-by: Neil Brown <neilb@suse.de>
### Diffstat output ./include/linux/sunrpc/svcsock.h | 1 + ./net/sunrpc/svcsock.c | 12 ++++++------ 2 files changed, 7 insertions(+), 6 deletions(-)
diff .prev/include/linux/sunrpc/svcsock.h ./include/linux/sunrpc/svcsock.h --- .prev/include/linux/sunrpc/svcsock.h 2006-07-31 09:58:07.000000000 +1000 +++ ./include/linux/sunrpc/svcsock.h 2006-07-31 10:00:30.000000000 +1000 @@ -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 .prev/net/sunrpc/svcsock.c ./net/sunrpc/svcsock.c --- .prev/net/sunrpc/svcsock.c 2006-07-31 09:58:07.000000000 +1000 +++ ./net/sunrpc/svcsock.c 2006-07-31 10:00:30.000000000 +1000 @@ -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; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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