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4ddd0fc32c
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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
..
acpi ACPI: scan: Use unique number for instance_no 2021-03-22 17:45:53 +01:00
asm-generic RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
clocksource
crypto Keyrings miscellany 2021-02-23 16:09:23 -08:00
drm drm/ttm: make ttm_bo_unpin more defensive 2021-03-15 16:02:30 +01:00
dt-bindings RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
keys
kunit
kvm KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key 2021-03-06 04:18:40 -05:00
linux NFS: The 'fattr_valid' field in struct nfs_server should be unsigned int 2021-04-21 07:53:03 -04:00
math-emu
media media: rc: compile rc-cec.c into rc-core 2021-03-11 11:40:28 +01:00
memory
misc
net sch_red: Fix a typo 2021-03-19 11:51:03 -07:00
pcmcia
ras
rdma
scsi scsi: iscsi: Fix race condition between login and sync thread 2021-03-29 21:17:45 -04:00
soc RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
sound ALSA/ASoC/SOF/SoundWire: fix Kconfig issues 2021-03-02 18:30:07 +01:00
target scsi: target: core: Add cmd length set before cmd complete 2021-02-22 22:21:29 -05:00
trace xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation 2021-04-26 09:25:58 -04:00
uapi block-5.12-2021-04-02 2021-04-02 16:13:13 -07:00
vdso
video
xen Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF} 2021-03-10 16:39:29 -06:00