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SUNRPC: remove timeout arg from svc_recv()

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Most svc threads have no interest in a timeout.
nfsd sets it to 1 hour, but this is a wart of no significance.

lockd uses the timeout so that it can call nlmsvc_retry_blocked().
It also sometimes calls svc_wake_up() to ensure this is called.

So change lockd to be consistent and always use svc_wake_up() to trigger
nlmsvc_retry_blocked() - using a timer instead of a timeout to
svc_recv().

And change svc_recv() to not take a timeout arg.

This makes the sp_threads_timedout counter always zero.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2023-07-18 16:38:08 +10:00 • committed by Chuck Lever
parent 7b719e2bf3
commit c743b4259c
9 changed files with 34 additions and 32 deletions
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14
fs/lockd/svc.c
View file

@ -56,6 +56,12 @@ static unsigned int nlmsvc_users;
static struct svc_serv *nlmsvc_serv;
unsigned long nlmsvc_timeout;
static void nlmsvc_request_retry(struct timer_list *tl)
{
svc_wake_up(nlmsvc_serv);
}
DEFINE_TIMER(nlmsvc_retry, nlmsvc_request_retry);
unsigned int lockd_net_id;
/*
@ -130,14 +136,11 @@ lockd(void *vrqstp)
* NFS mount or NFS daemon has gone away.
*/
while (!kthread_should_stop()) {
long timeout = MAX_SCHEDULE_TIMEOUT;
/* update sv_maxconn if it has changed */
rqstp->rq_server->sv_maxconn = nlm_max_connections;
timeout = nlmsvc_retry_blocked();
svc_recv(rqstp, timeout);
nlmsvc_retry_blocked();
svc_recv(rqstp);
}
if (nlmsvc_ops)
nlmsvc_invalidate_all();
@ -371,6 +374,7 @@ static void lockd_put(void)
#endif
svc_set_num_threads(nlmsvc_serv, NULL, 0);
timer_delete_sync(&nlmsvc_retry);
nlmsvc_serv = NULL;
dprintk("lockd_down: service destroyed\n");
}

5
fs/lockd/svclock.c
View file

@ -1019,7 +1019,7 @@ retry_deferred_block(struct nlm_block *block)
* picks up locks that can be granted, or grant notifications that must
* be retransmitted.
*/
unsigned long
void
nlmsvc_retry_blocked(void)
{
unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
@ -1049,5 +1049,6 @@ nlmsvc_retry_blocked(void)
}
spin_unlock(&nlm_blocked_lock);
return timeout;
if (timeout < MAX_SCHEDULE_TIMEOUT)
mod_timer(&nlmsvc_retry, jiffies + timeout);
}

2
fs/nfs/callback.c
View file

@ -79,7 +79,7 @@ nfs4_callback_svc(void *vrqstp)
set_freezable();
while (!kthread_freezable_should_stop(NULL))
svc_recv(rqstp, MAX_SCHEDULE_TIMEOUT);
svc_recv(rqstp);
svc_exit_thread(rqstp);
return 0;

2
fs/nfsd/nfssvc.c
View file

@ -961,7 +961,7 @@ nfsd(void *vrqstp)
/* Update sv_maxconn if it has changed */
rqstp->rq_server->sv_maxconn = nn->max_connections;
svc_recv(rqstp, 60*60*HZ);
svc_recv(rqstp);
validate_process_creds();
}

4
include/linux/lockd/lockd.h
View file

@ -204,6 +204,8 @@ extern unsigned long nlmsvc_timeout;
extern bool nsm_use_hostnames;
extern u32 nsm_local_state;
extern struct timer_list nlmsvc_retry;
/*
* Lockd client functions
*/
@ -280,7 +282,7 @@ __be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
struct nlm_host *, struct nlm_lock *,
struct nlm_lock *, struct nlm_cookie *);
__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
unsigned long nlmsvc_retry_blocked(void);
void nlmsvc_retry_blocked(void);
void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
nlm_host_match_fn_t match);
void nlmsvc_grant_reply(struct nlm_cookie *, __be32);

1
include/linux/sunrpc/svc.h
View file

@ -41,7 +41,6 @@ struct svc_pool {
/* statistics on pool operation */
struct percpu_counter sp_sockets_queued;
struct percpu_counter sp_threads_woken;
struct percpu_counter sp_threads_timedout;
#define SP_TASK_PENDING (0) /* still work to do even if no
* xprt is queued. */

2
include/linux/sunrpc/svcsock.h
View file

@ -57,7 +57,7 @@ static inline u32 svc_sock_final_rec(struct svc_sock *svsk)
* Function prototypes.
*/
void svc_close_net(struct svc_serv *, struct net *);
void svc_recv(struct svc_rqst *, long);
void svc_recv(struct svc_rqst *rqstp);
void svc_send(struct svc_rqst *rqstp);
void svc_drop(struct svc_rqst *);
void svc_sock_update_bufs(struct svc_serv *serv);

2
net/sunrpc/svc.c
View file

@ -515,7 +515,6 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
percpu_counter_init(&pool->sp_sockets_queued, 0, GFP_KERNEL);
percpu_counter_init(&pool->sp_threads_woken, 0, GFP_KERNEL);
percpu_counter_init(&pool->sp_threads_timedout, 0, GFP_KERNEL);
}
return serv;
@ -590,7 +589,6 @@ svc_destroy(struct kref *ref)
percpu_counter_destroy(&pool->sp_sockets_queued);
percpu_counter_destroy(&pool->sp_threads_woken);
percpu_counter_destroy(&pool->sp_threads_timedout);
}
kfree(serv->sv_pools);
kfree(serv);

34
net/sunrpc/svc_xprt.c
View file

@ -750,10 +750,9 @@ rqst_should_sleep(struct svc_rqst *rqstp)
return true;
}
static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp)
{
struct svc_pool *pool = rqstp->rq_pool;
long time_left = 0;
/* rq_xprt should be clear on entry */
WARN_ON_ONCE(rqstp->rq_xprt);
@ -769,7 +768,7 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
smp_mb__after_atomic();
if (likely(rqst_should_sleep(rqstp)))
time_left = schedule_timeout(timeout);
schedule();
else
__set_current_state(TASK_RUNNING);
@ -781,9 +780,6 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
if (rqstp->rq_xprt)
goto out_found;
if (!time_left)
percpu_counter_inc(&pool->sp_threads_timedout);
if (kthread_should_stop())
return NULL;
return NULL;
@ -863,12 +859,15 @@ out:
return len;
}
/*
* Receive the next request on any transport. This code is carefully
* organised not to touch any cachelines in the shared svc_serv
* structure, only cachelines in the local svc_pool.
/**
* svc_recv - Receive and process the next request on any transport
* @rqstp: an idle RPC service thread
*
* This code is carefully organised not to touch any cachelines in
* the shared svc_serv structure, only cachelines in the local
* svc_pool.
*/
void svc_recv(struct svc_rqst *rqstp, long timeout)
void svc_recv(struct svc_rqst *rqstp)
{
struct svc_xprt *xprt = NULL;
struct svc_serv *serv = rqstp->rq_server;
@ -882,7 +881,7 @@ void svc_recv(struct svc_rqst *rqstp, long timeout)
if (kthread_should_stop())
goto out;
xprt = svc_get_next_xprt(rqstp, timeout);
xprt = svc_get_next_xprt(rqstp);
if (!xprt)
goto out;
@ -1447,12 +1446,11 @@ static int svc_pool_stats_show(struct seq_file *m, void *p)
return 0;
}
seq_printf(m, "%u %llu %llu %llu %llu\n",
pool->sp_id,
percpu_counter_sum_positive(&pool->sp_sockets_queued),
percpu_counter_sum_positive(&pool->sp_sockets_queued),
percpu_counter_sum_positive(&pool->sp_threads_woken),
percpu_counter_sum_positive(&pool->sp_threads_timedout));
seq_printf(m, "%u %llu %llu %llu 0\n",
pool->sp_id,
percpu_counter_sum_positive(&pool->sp_sockets_queued),
percpu_counter_sum_positive(&pool->sp_sockets_queued),
percpu_counter_sum_positive(&pool->sp_threads_woken));
return 0;
}