linux-kernel - [PATCH v2 2/2] 9p: Track 9P RPC waiting time as IO

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Message-ID: <b8601271263011203fa34eada2e8ac21d9f679e5.1769179462.git.repk@triplefau.lt>
Date: Fri, 23 Jan 2026 15:48:08 +0100
From: Remi Pommarel <repk@...plefau.lt>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 v9fs@...ts.linux.dev
Cc: Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Eric Van Hensbergen <ericvh@...nel.org>,
 Latchesar Ionkov <lucho@...kov.net>,
 Dominique Martinet <asmadeus@...ewreck.org>, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, Remi Pommarel <repk@...plefau.lt>
Subject: [PATCH v2 2/2] 9p: Track 9P RPC waiting time as IO

Use io_wait_event_killable() to ensure that time spent waiting for 9P
RPC transactions is accounted as IO wait time.

Signed-off-by: Remi Pommarel <repk@...plefau.lt>
---
 net/9p/client.c       |  4 ++--
 net/9p/trans_virtio.c | 14 +++++++-------
 net/9p/trans_xen.c    |  4 ++--
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index f60d1d041adb..1b475525ac5b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -590,8 +590,8 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 	}
 again:
 	/* Wait for the response */
-	err = wait_event_killable(req->wq,
-				  READ_ONCE(req->status) >= REQ_STATUS_RCVD);
+	err = io_wait_event_killable(req->wq,
+				     READ_ONCE(req->status) >= REQ_STATUS_RCVD);
 
 	/* Make sure our req is coherent with regard to updates in other
 	 * threads - echoes to wmb() in the callback
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 10c2dd486438..370f4f37dcec 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -284,8 +284,8 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
 		if (err == -ENOSPC) {
 			chan->ring_bufs_avail = 0;
 			spin_unlock_irqrestore(&chan->lock, flags);
-			err = wait_event_killable(*chan->vc_wq,
-						  chan->ring_bufs_avail);
+			err = io_wait_event_killable(*chan->vc_wq,
+						     chan->ring_bufs_avail);
 			if (err  == -ERESTARTSYS)
 				return err;
 
@@ -325,7 +325,7 @@ static int p9_get_mapped_pages(struct virtio_chan *chan,
 		 * Other zc request to finish here
 		 */
 		if (atomic_read(&vp_pinned) >= chan->p9_max_pages) {
-			err = wait_event_killable(vp_wq,
+			err = io_wait_event_killable(vp_wq,
 			      (atomic_read(&vp_pinned) < chan->p9_max_pages));
 			if (err == -ERESTARTSYS)
 				return err;
@@ -512,8 +512,8 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
 		if (err == -ENOSPC) {
 			chan->ring_bufs_avail = 0;
 			spin_unlock_irqrestore(&chan->lock, flags);
-			err = wait_event_killable(*chan->vc_wq,
-						  chan->ring_bufs_avail);
+			err = io_wait_event_killable(*chan->vc_wq,
+						     chan->ring_bufs_avail);
 			if (err  == -ERESTARTSYS)
 				goto err_out;
 
@@ -531,8 +531,8 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
 	spin_unlock_irqrestore(&chan->lock, flags);
 	kicked = 1;
 	p9_debug(P9_DEBUG_TRANS, "virtio request kicked\n");
-	err = wait_event_killable(req->wq,
-			          READ_ONCE(req->status) >= REQ_STATUS_RCVD);
+	err = io_wait_event_killable(req->wq,
+				     READ_ONCE(req->status) >= REQ_STATUS_RCVD);
 	// RERROR needs reply (== error string) in static data
 	if (READ_ONCE(req->status) == REQ_STATUS_RCVD &&
 	    unlikely(req->rc.sdata[4] == P9_RERROR))
diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index 12f752a92332..d57965e6aab0 100644
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -136,8 +136,8 @@ static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
 	ring = &priv->rings[num];
 
 again:
-	while (wait_event_killable(ring->wq,
-				   p9_xen_write_todo(ring, size)) != 0)
+	while (io_wait_event_killable(ring->wq,
+				      p9_xen_write_todo(ring, size)) != 0)
 		;
 
 	spin_lock_irqsave(&ring->lock, flags);
-- 
2.50.1