linux-kernel - [PATCH v2 3/8] sunrpc: track the max number of requested threads in a pool

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Message-Id: <20260106-nfsd-dynathread-v2-3-416e5f27b2b6@kernel.org>
Date: Tue, 06 Jan 2026 13:59:45 -0500
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>, 
 Anna Schumaker <anna@...nel.org>
Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v2 3/8] 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@...nel.org>
---
 include/linux/sunrpc/svc.h | 3 ++-
 net/sunrpc/svc.c           | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 2676bf276d6ba43772ecee65b94207b438168679..ec2b6ef5482352e61a9861a19f0ae4a610985ae9 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -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 */
 
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index fd52ebec0655f2289d792f4aac02859d90d290fd..1f6c0da4b7da0acf8db88dc60e790c955d200c96 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -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)

-- 
2.52.0