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4ddd0fc32c
linux/net/sunrpc
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Chuck Lever 4ddd0fc32c xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation 
The Send signaling logic is a little subtle, so add some
observability around it. For every xprtrdma_mr_fastreg event, there
should be an xprtrdma_mr_localinv or xprtrdma_mr_reminv event.

When these tracepoints are enabled, we can see exactly when an MR is
DMA-mapped, registered, invalidated (either locally or remotely) and
then DMA-unmapped.

   kworker/u25:2-190   [000]   787.979512: xprtrdma_mr_map:      task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
   kworker/u25:2-190   [000]   787.979515: xprtrdma_chunk_read:  task:351@5 pos=148 5608@0x8679e0c8f6f56000:0x00000503 (last)
   kworker/u25:2-190   [000]   787.979519: xprtrdma_marshal:     task:351@5 xid=0x8679e0c8: hdr=52 xdr=148/5608/0 read list/inline
   kworker/u25:2-190   [000]   787.979525: xprtrdma_mr_fastreg:  task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
   kworker/u25:2-190   [000]   787.979526: xprtrdma_post_send:   task:351@5 cq.id=0 cid=73 (2 SGEs)

 ...

    kworker/5:1H-219   [005]   787.980567: xprtrdma_wc_receive:  cq.id=1 cid=161 status=SUCCESS (0/0x0) received=164
    kworker/5:1H-219   [005]   787.980571: xprtrdma_post_recvs:  peer=[192.168.100.55]:20049 r_xprt=0xffff8884974d4000: 0 new recvs, 70 active (rc 0)
    kworker/5:1H-219   [005]   787.980573: xprtrdma_reply:       task:351@5 xid=0x8679e0c8 credits=64
    kworker/5:1H-219   [005]   787.980576: xprtrdma_mr_reminv:   task:351@5 mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)
    kworker/5:1H-219   [005]   787.980577: xprtrdma_mr_unmap:    mr.id=4 nents=2 5608@0x8679e0c8f6f56000:0x00000503 (TO_DEVICE)

Note that I've moved the xprtrdma_post_send tracepoint so that event
always appears after the xprtrdma_mr_fastreg tracepoint. Otherwise
the event log looks counterintuitive (FastReg is always supposed to
happen before Send).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2021-04-26 09:25:58 -04:00
..
auth_gss rpc: fix NULL dereference on kmalloc failure 2021-03-06 16:41:49 -05:00
xprtrdma xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation 2021-04-26 09:25:58 -04:00
addr.c net: sunrpc: interpret the return value of kstrtou32 correctly 2021-01-10 13:32:51 -05:00
auth_null.c
auth_unix.c
auth.c sunrpc: add missing newline when printing parameter 'auth_hashtable_size' by sysfs 2020-06-11 13:33:48 -04:00
backchannel_rqst.c The one new feature this time, from Anna Schumaker, is READ_PLUS, which 2020-10-22 09:44:27 -07:00
cache.c sunrpc: clean-up cache downcall 2020-12-09 09:38:34 -05:00
clnt.c SUNRPC: Move fault injection call sites 2021-04-14 09:36:29 -04:00
debugfs.c net: sunrpc: Fix 'snprintf' return value check in 'do_xprt_debugfs' 2020-12-02 14:05:54 -05:00
Kconfig SUNRPC: remove RC4-HMAC-MD5 support from KerberosV 2020-09-11 14:39:15 +10:00
Makefile
netns.h
rpc_pipe.c SUNRPC: Fix fall-through warnings for Clang 2021-02-01 13:32:32 -05:00
rpcb_clnt.c sunrpc: honor rpc_task's timeout value in rpcb_create() 2021-04-05 09:04:21 -04:00
sched.c SUNRPC: Set memalloc_nofs_save() for sync tasks 2021-03-08 15:32:16 -05:00
socklib.c skb_copy_and_csum_bits(): don't bother with the last argument 2020-08-20 15:45:13 -04:00
socklib.h SUNRPC: Refactor xs_sendpages() 2020-03-16 12:04:33 -04:00
stats.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
sunrpc_syms.c sunrpc: check that domain table is empty at module unload. 2020-05-28 18:15:00 -04:00
sunrpc.h Replace HTTP links with HTTPS ones: NFS, SUNRPC, and LOCKD clients 2020-09-21 10:21:10 -04:00
svc_xprt.c NFSD: Repair misuse of sv_lock in 5.10.16-rt30. 2021-03-06 16:41:48 -05:00
svc.c sunrpc: fix refcount leak for rpc auth modules 2021-03-06 16:41:49 -05:00
svcauth_unix.c sunrpc: Remove unused function ip_map_update 2020-05-06 16:00:11 -04:00
svcauth.c sunrpc: check that domain table is empty at module unload. 2020-05-28 18:15:00 -04:00
svcsock.c SUNRPC: Further clean up svc_tcp_sendmsg() 2021-02-16 12:38:12 -05:00
sysctl.c net/sunrpc: fix useless comparison in proc_do_xprt() 2020-11-08 16:28:25 -05:00
timer.c
xdr.c NFS client updates for Linux 5.11 2020-12-17 12:15:03 -08:00
xprt.c SUNRPC: Handle major timeout in xprt_adjust_timeout() 2021-04-14 09:36:30 -04:00
xprtmultipath.c
xprtsock.c SUNRPC: Ensure the transport backchannel association 2021-04-05 09:04:21 -04:00