From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Dai Ngo <dai.ngo@oracle.com>, Jeff Layton <jlayton@kernel.org>,
Trond Myklebust <trond.myklebust@hammerspace.com>,
Sasha Levin <sashal@kernel.org>,
chuck.lever@oracle.com, anna@kernel.org,
linux-nfs@vger.kernel.org
Subject: [PATCH AUTOSEL 6.8 65/98] SUNRPC: increase size of rpc_wait_queue.qlen from unsigned short to unsigned int
Date: Fri, 29 Mar 2024 08:37:36 -0400 [thread overview]
Message-ID: <20240329123919.3087149-65-sashal@kernel.org> (raw)
In-Reply-To: <20240329123919.3087149-1-sashal@kernel.org>
From: Dai Ngo <dai.ngo@oracle.com>
[ Upstream commit 2c35f43b5a4b9cdfaa6fdd946f5a212615dac8eb ]
When the NFS client is under extreme load the rpc_wait_queue.qlen counter
can be overflowed. Here is an instant of the backlog queue overflow in a
real world environment shown by drgn helper:
rpc_task_stats(rpc_clnt):
-------------------------
rpc_clnt: 0xffff92b65d2bae00
rpc_xprt: 0xffff9275db64f000
Queue: sending[64887] pending[524] backlog[30441] binding[0]
XMIT task: 0xffff925c6b1d8e98
WRITE: 750654
__dta_call_status_580: 65463
__dta_call_transmit_status_579: 1
call_reserveresult: 685189
nfs_client_init_is_complete: 1
COMMIT: 584
call_reserveresult: 573
__dta_call_status_580: 11
ACCESS: 1
__dta_call_status_580: 1
GETATTR: 10
__dta_call_status_580: 4
call_reserveresult: 6
751249 tasks for server 111.222.333.444
Total tasks: 751249
count_rpc_wait_queues(xprt):
----------------------------
**** rpc_xprt: 0xffff9275db64f000 num_reqs: 65511
wait_queue: xprt_binding[0] cnt: 0
wait_queue: xprt_binding[1] cnt: 0
wait_queue: xprt_binding[2] cnt: 0
wait_queue: xprt_binding[3] cnt: 0
rpc_wait_queue[xprt_binding].qlen: 0 maxpriority: 0
wait_queue: xprt_sending[0] cnt: 0
wait_queue: xprt_sending[1] cnt: 64887
wait_queue: xprt_sending[2] cnt: 0
wait_queue: xprt_sending[3] cnt: 0
rpc_wait_queue[xprt_sending].qlen: 64887 maxpriority: 3
wait_queue: xprt_pending[0] cnt: 524
wait_queue: xprt_pending[1] cnt: 0
wait_queue: xprt_pending[2] cnt: 0
wait_queue: xprt_pending[3] cnt: 0
rpc_wait_queue[xprt_pending].qlen: 524 maxpriority: 0
wait_queue: xprt_backlog[0] cnt: 0
wait_queue: xprt_backlog[1] cnt: 685801
wait_queue: xprt_backlog[2] cnt: 0
wait_queue: xprt_backlog[3] cnt: 0
rpc_wait_queue[xprt_backlog].qlen: 30441 maxpriority: 3 [task cnt mismatch]
There is no effect on operations when this overflow occurs. However
it causes confusion when trying to diagnose the performance problem.
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/linux/sunrpc/sched.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 2d61987b35456..0c77ba488bbae 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -197,7 +197,7 @@ struct rpc_wait_queue {
unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
unsigned char priority; /* current priority */
unsigned char nr; /* # tasks remaining for cookie */
- unsigned short qlen; /* total # tasks waiting in queue */
+ unsigned int qlen; /* total # tasks waiting in queue */
struct rpc_timer timer_list;
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
const char * name;
--
2.43.0
parent reply other threads:[~2024-03-29 12:42 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20240329123919.3087149-1-sashal@kernel.org>]
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