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authorSteve French <stfrench@microsoft.com>2018-08-04 13:24:34 +0300
committerSteve French <stfrench@microsoft.com>2018-08-07 22:30:59 +0300
commit468d677954c0d94fec59275d91222257fe8b4416 (patch)
tree447717951ad83b14eb46b9ebb2a2a3d053380144 /fs/cifs
parenta5c62f4833c2c8e6e0f35367b99b717b78f5c029 (diff)
downloadlinux-468d677954c0d94fec59275d91222257fe8b4416.tar.xz
smb3: display stats counters for number of slow commands
When CONFIG_CIFS_STATS2 is enabled keep counters for slow commands (ie server took longer than 1 second to respond) by SMB2/SMB3 command code. This can help in diagnosing whether performance problems are on server (instead of client) and which commands are causing the problem. Sample output (the new lines contain words "slow responses ...") $ cat /proc/fs/cifs/Stats Resources in use CIFS Session: 1 Share (unique mount targets): 2 SMB Request/Response Buffer: 1 Pool size: 5 SMB Small Req/Resp Buffer: 1 Pool size: 30 Total Large 10 Small 490 Allocations Operations (MIDs): 0 0 session 0 share reconnects Total vfs operations: 67 maximum at one time: 2 4 slow responses from localhost for command 5 1 slow responses from localhost for command 6 1 slow responses from localhost for command 14 1 slow responses from localhost for command 16 1) \\localhost\test SMBs: 243 Bytes read: 1024000 Bytes written: 104857600 TreeConnects: 1 total 0 failed TreeDisconnects: 0 total 0 failed Creates: 40 total 0 failed Closes: 39 total 0 failed ... Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifs_debug.c19
-rw-r--r--fs/cifs/cifsglob.h3
-rw-r--r--fs/cifs/transport.c5
3 files changed, 24 insertions, 3 deletions
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 748cabd6d20b..f1fbea947fef 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -378,6 +378,8 @@ static ssize_t cifs_stats_proc_write(struct file *file,
rc = kstrtobool_from_user(buffer, count, &bv);
if (rc == 0) {
#ifdef CONFIG_CIFS_STATS2
+ int i;
+
atomic_set(&totBufAllocCount, 0);
atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */
@@ -389,6 +391,10 @@ static ssize_t cifs_stats_proc_write(struct file *file,
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
+#ifdef CONFIG_CIFS_STATS2
+ for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++)
+ atomic_set(&server->smb2slowcmd[i], 0);
+#endif /* CONFIG_CIFS_STATS2 */
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifs_ses,
smb_ses_list);
@@ -417,13 +423,15 @@ static ssize_t cifs_stats_proc_write(struct file *file,
static int cifs_stats_proc_show(struct seq_file *m, void *v)
{
int i;
+#ifdef CONFIG_CIFS_STATS2
+ int j;
+#endif /* STATS2 */
struct list_head *tmp1, *tmp2, *tmp3;
struct TCP_Server_Info *server;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
- seq_printf(m,
- "Resources in use\nCIFS Session: %d\n",
+ seq_printf(m, "Resources in use\nCIFS Session: %d\n",
sesInfoAllocCount.counter);
seq_printf(m, "Share (unique mount targets): %d\n",
tconInfoAllocCount.counter);
@@ -452,6 +460,13 @@ static int cifs_stats_proc_show(struct seq_file *m, void *v)
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
+#ifdef CONFIG_CIFS_STATS2
+ for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
+ if (atomic_read(&server->smb2slowcmd[j]))
+ seq_printf(m, "%d slow responses from %s for command %d\n",
+ atomic_read(&server->smb2slowcmd[j]),
+ server->hostname, j);
+#endif /* STATS2 */
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifs_ses,
smb_ses_list);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 0553929e8339..41803d374da0 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -680,7 +680,8 @@ struct TCP_Server_Info {
#ifdef CONFIG_CIFS_STATS2
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
-#endif
+ atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
+#endif /* STATS2 */
unsigned int max_read;
unsigned int max_write;
__le16 cipher_type;
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 92de5c528161..c53c0908d4c6 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -117,6 +117,11 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
something is wrong, unless it is quite a slow link or server */
if (time_after(now, midEntry->when_alloc + HZ) &&
(midEntry->command != command)) {
+ /* smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command */
+ if ((le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) &&
+ (le16_to_cpu(midEntry->command) >= 0))
+ cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]);
+
trace_smb3_slow_rsp(le16_to_cpu(midEntry->command),
midEntry->mid, midEntry->pid,
midEntry->when_sent, midEntry->when_received);