diff options
| author |   Steve French <stfrench@microsoft.com> | 2018-08-01 16:38:07 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-08-07 14:28:01 -0500 |
| commit | 020eec5f712ffb4254233490076cc21600b810db (patch) | |
| tree | 9d32f5f44706a3d54991eaaa2b0c5b9f81fd13bb /fs/cifs/transport.c | |
| parent | cifs: add compound_send_recv() (diff) | |
| download | linux-dev-020eec5f712ffb4254233490076cc21600b810db.tar.xz linux-dev-020eec5f712ffb4254233490076cc21600b810db.zip | |
smb3: add tracepoint for slow responses
If responses take longer than one second from the server,
we can optionally log them to dmesg in current cifs.ko code
(CONFIG_CIFS_STATS2 must be configured and a
/proc/fs/cifs/cifsFYI flag must be set), but can be more useful
to log these via ftrace (tracepoint is smb3_slow_rsp) which
is easier and more granular (still requires CONFIG_CIFS_STATS2
to be configured in the build though).
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs/cifs/transport.c')
| -rw-r--r-- | fs/cifs/transport.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 0b9d0e859f86..92de5c528161 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -115,8 +115,12 @@ DeleteMidQEntry(struct mid_q_entry *midEntry) now = jiffies; /* commands taking longer than one second are indications that something is wrong, unless it is quite a slow link or server */ - if (time_after(now, midEntry->when_alloc + HZ)) { - if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { + if (time_after(now, midEntry->when_alloc + HZ) && + (midEntry->command != command)) { + trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), + midEntry->mid, midEntry->pid, + midEntry->when_sent, midEntry->when_received); + if (cifsFYI & CIFS_TIMER) { pr_debug(" CIFS slow rsp: cmd %d mid %llu", midEntry->command, midEntry->mid); pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |