Commit 6cd60f42 authored Jan 06, 2026 by Jeff Layton Committed by Chuck Lever Jan 28, 2026

sunrpc: track the max number of requested threads in a pool

The kernel currently tracks the number of threads running in a pool in
the "sp_nrthreads" field. In the future, where threads are dynamically
spun up and down, it'll be necessary to keep track of the maximum number
of requested threads separately from the actual number running.

Add a pool->sp_nrthrmax parameter to track this. When userland changes
the number of threads in a pool, update that value accordingly.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

parent 2c01f0cf

include/linux/sunrpc/svc.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -35,8 +35,9 @@
		*/
		struct svc_pool {
		unsigned int sp_id; /* pool id; also node id on NUMA */
		unsigned int sp_nrthreads; /* # of threads currently running in pool */
		unsigned int sp_nrthrmax; /* Max requested number of threads in pool */
		struct lwq sp_xprts; /* pending transports */
		unsigned int sp_nrthreads; /* # of threads in pool */
		struct list_head sp_all_threads; /* all server threads */
		struct llist_head sp_idle_threads; /* idle server threads */

net/sunrpc/svc.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -839,6 +839,7 @@ svc_set_pool_threads(struct svc_serv serv, struct svc_pool pool,
		if (!pool)
		return -EINVAL;

		pool->sp_nrthrmax = nrservs;
		delta -= pool->sp_nrthreads;

		if (delta > 0)