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authorSteve French <stfrench@microsoft.com>2018-08-01 16:38:07 -0500
committerSteve French <stfrench@microsoft.com>2018-08-07 14:28:01 -0500
commit020eec5f712ffb4254233490076cc21600b810db (patch)
tree9d32f5f44706a3d54991eaaa2b0c5b9f81fd13bb /fs/cifs/transport.c
parente0bba0b8548179b696e86c158ea8f45f2ef6ad14 (diff)
downloadlinux-020eec5f712ffb4254233490076cc21600b810db.tar.bz2
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.c8
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",