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Dai Ngo f0d8fd2f82 SUNRPC: increase size of rpc_wait_queue.qlen from unsigned short to unsigned int 
[ 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>
2024-11-19 09:23:14 +01:00
..
addr.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
auth.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
auth_gss.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bc_xprt.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cache.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
clnt.h SUNRPC: Fix RPC client cleaned up the freed pipefs dentries 2024-11-18 11:43:19 +01:00
debug.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gss_api.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gss_asn1.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gss_err.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gss_krb5.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
gss_krb5_enctypes.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
metrics.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
msg_prot.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpc_pipe_fs.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpc_rdma.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpc_rdma_cid.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sched.h SUNRPC: increase size of rpc_wait_queue.qlen from unsigned short to unsigned int 2024-11-19 09:23:14 +01:00
stats.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svc.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svc_rdma.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svc_xprt.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svcauth.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svcauth_gss.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
svcsock.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
timer.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
types.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xdr.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xprt.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xprtmultipath.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xprtrdma.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xprtsock.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00