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rxrpc: Fix conn expiry timers

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Fix the rxrpc connection expiry timers so that connections for closed
AF_RXRPC sockets get deleted in a more timely fashion, freeing up the
transport UDP port much more quickly.

 (1) Replace the delayed work items with work items plus timers so that
     timer_reduce() can be used to shorten them and so that the timer
     doesn't requeue the work item if the net namespace is dead.

 (2) Don't use queue_delayed_work() as that won't alter the timeout if the
     timer is already running.

 (3) Don't rearm the timers if the network namespace is dead.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2017-11-24 10:18:42 +00:00
parent f859ab6187
commit 3d18cbb7fd
5 changed files with 68 additions and 28 deletions
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30
net/rxrpc/conn_client.c
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@@ -691,7 +691,7 @@ int rxrpc_connect_call(struct rxrpc_call *call,
_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper.work);
rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper);
rxrpc_cull_active_client_conns(rxnet);
ret = rxrpc_get_client_conn(call, cp, srx, gfp);
@@ -756,6 +756,18 @@ void rxrpc_expose_client_call(struct rxrpc_call *call)
}
}
/*
* Set the reap timer.
*/
static void rxrpc_set_client_reap_timer(struct rxrpc_net *rxnet)
{
unsigned long now = jiffies;
unsigned long reap_at = now + rxrpc_conn_idle_client_expiry;
if (rxnet->live)
timer_reduce(&rxnet->client_conn_reap_timer, reap_at);
}
/*
* Disconnect a client call.
*/
@@ -896,9 +908,7 @@ idle_connection:
list_move_tail(&conn->cache_link, &rxnet->idle_client_conns);
if (rxnet->idle_client_conns.next == &conn->cache_link &&
!rxnet->kill_all_client_conns)
queue_delayed_work(rxrpc_workqueue,
&rxnet->client_conn_reaper,
rxrpc_conn_idle_client_expiry);
rxrpc_set_client_reap_timer(rxnet);
} else {
trace_rxrpc_client(conn, channel, rxrpc_client_to_inactive);
conn->cache_state = RXRPC_CONN_CLIENT_INACTIVE;
@@ -1036,8 +1046,7 @@ void rxrpc_discard_expired_client_conns(struct work_struct *work)
{
struct rxrpc_connection *conn;
struct rxrpc_net *rxnet =
container_of(to_delayed_work(work),
struct rxrpc_net, client_conn_reaper);
container_of(work, struct rxrpc_net, client_conn_reaper);
unsigned long expiry, conn_expires_at, now;
unsigned int nr_conns;
bool did_discard = false;
@@ -1116,9 +1125,8 @@ not_yet_expired:
*/
_debug("not yet");
if (!rxnet->kill_all_client_conns)
queue_delayed_work(rxrpc_workqueue,
&rxnet->client_conn_reaper,
conn_expires_at - now);
timer_reduce(&rxnet->client_conn_reap_timer,
conn_expires_at);
out:
spin_unlock(&rxnet->client_conn_cache_lock);
@@ -1138,9 +1146,9 @@ void rxrpc_destroy_all_client_connections(struct rxrpc_net *rxnet)
rxnet->kill_all_client_conns = true;
spin_unlock(&rxnet->client_conn_cache_lock);
cancel_delayed_work(&rxnet->client_conn_reaper);
del_timer_sync(&rxnet->client_conn_reap_timer);
if (!queue_delayed_work(rxrpc_workqueue, &rxnet->client_conn_reaper, 0))
if (!rxrpc_queue_work(&rxnet->client_conn_reaper))
_debug("destroy: queue failed");
_leave("");