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SUNRPC: Per-rpc_clnt task PIDs

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The current range of RPC task PIDs is 0..65535. That's not adequate
for distinguishing tasks across multiple rpc_clnts running high
throughput workloads.

To help relieve this situation and to reduce the bottleneck of
having a single atomic for assigning all RPC task PIDs, assign task
PIDs per rpc_clnt.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Chuck Lever 2021-10-04 10:10:10 -04:00 committed by Trond Myklebust
parent 8e09650f5e
commit 0392dd51f9
2 changed files with 11 additions and 2 deletions
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1
include/linux/sunrpc/clnt.h
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@ -40,6 +40,7 @@ struct rpc_clnt {
unsigned int cl_clid; /* client id */
struct list_head cl_clients; /* Global list of clients */
struct list_head cl_tasks; /* List of tasks */
atomic_t cl_pid; /* task PID counter */
spinlock_t cl_lock; /* spinlock */
struct rpc_xprt __rcu * cl_xprt; /* transport */
const struct rpc_procinfo *cl_procinfo; /* procedure info */

12
net/sunrpc/sched.c
View file

@ -277,9 +277,17 @@ static int rpc_wait_bit_killable(struct wait_bit_key *key, int mode)
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
static void rpc_task_set_debuginfo(struct rpc_task *task)
{
static atomic_t rpc_pid;
struct rpc_clnt *clnt = task->tk_client;
task->tk_pid = atomic_inc_return(&rpc_pid);
/* Might be a task carrying a reverse-direction operation */
if (!clnt) {
static atomic_t rpc_pid;
task->tk_pid = atomic_inc_return(&rpc_pid);
return;
}
task->tk_pid = atomic_inc_return(&clnt->cl_pid);
}
#else
static inline void rpc_task_set_debuginfo(struct rpc_task *task)