SMB3: Track total time spent on roundtrips for each SMB3 command

Also track minimum and maximum time by command in /proc/fs/cifs/Stats

Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 13c1288..19ed9ab 100644 (file)
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -462,8 +462,13 @@ static ssize_t cifs_stats_proc_write(struct file *file,
                        server = list_entry(tmp1, struct TCP_Server_Info,
                                            tcp_ses_list);
 #ifdef CONFIG_CIFS_STATS2
-                       for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++)
+                       for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
+                               atomic_set(&server->num_cmds[i], 0);
                                atomic_set(&server->smb2slowcmd[i], 0);
+                               server->time_per_cmd[i] = 0;
+                               server->slowest_cmd[i] = 0;
+                               server->fastest_cmd[0] = 0;
+                       }
 #endif /* CONFIG_CIFS_STATS2 */
                        list_for_each(tmp2, &server->smb_ses_list) {
                                ses = list_entry(tmp2, struct cifs_ses,
@@ -531,9 +536,19 @@ static int cifs_stats_proc_show(struct seq_file *m, void *v)
                server = list_entry(tmp1, struct TCP_Server_Info,
                                    tcp_ses_list);
 #ifdef CONFIG_CIFS_STATS2
+               seq_puts(m, "\nTotal time spent processing by command. Time ");
+               seq_printf(m, "units are jiffies (%d per second)\n", HZ);
+               seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
+               seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
+               for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
+                       seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
+                               atomic_read(&server->num_cmds[j]),
+                               server->time_per_cmd[j],
+                               server->fastest_cmd[j],
+                               server->slowest_cmd[j]);
                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",
+                               seq_printf(m, "  %d slow responses from %s for command %d\n",
                                        atomic_read(&server->smb2slowcmd[j]),
                                        server->hostname, j);
 #endif /* STATS2 */

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 585ad32..779ceb1 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -714,7 +714,11 @@ 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 */
+       atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
        atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
+       __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
+       __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
+       __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
 #endif /* STATS2 */
        unsigned int    max_read;
        unsigned int    max_write;

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 1de8e99..65d9f3e 100644 (file)
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -104,7 +104,10 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
 {
 #ifdef CONFIG_CIFS_STATS2
        __le16 command = midEntry->server->vals->lock_cmd;
+       __u16 smb_cmd = le16_to_cpu(midEntry->command);
        unsigned long now;
+       unsigned long roundtrip_time;
+       struct TCP_Server_Info *server = midEntry->server;
 #endif
        midEntry->mid_state = MID_FREE;
        atomic_dec(&midCount);
@@ -114,6 +117,23 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
                cifs_small_buf_release(midEntry->resp_buf);
 #ifdef CONFIG_CIFS_STATS2
        now = jiffies;
+       if (now < midEntry->when_alloc)
+               cifs_dbg(VFS, "invalid mid allocation time\n");
+       roundtrip_time = now - midEntry->when_alloc;
+
+       if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) {
+               if (atomic_read(&server->num_cmds[smb_cmd]) == 0) {
+                       server->slowest_cmd[smb_cmd] = roundtrip_time;
+                       server->fastest_cmd[smb_cmd] = roundtrip_time;
+               } else {
+                       if (server->slowest_cmd[smb_cmd] < roundtrip_time)
+                               server->slowest_cmd[smb_cmd] = roundtrip_time;
+                       else if (server->fastest_cmd[smb_cmd] > roundtrip_time)
+                               server->fastest_cmd[smb_cmd] = roundtrip_time;
+               }
+               cifs_stats_inc(&server->num_cmds[smb_cmd]);
+               server->time_per_cmd[smb_cmd] += roundtrip_time;
+       }
        /*
         * commands taking longer than one second (default) can be indications
         * that something is wrong, unless it is quite a slow link or a very
@@ -131,11 +151,10 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
                 * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command
                 * NB: le16_to_cpu returns unsigned so can not be negative below
                 */
-               if (le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS)
-                       cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]);
+               if (smb_cmd < NUMBER_OF_SMB2_COMMANDS)
+                       cifs_stats_inc(&server->smb2slowcmd[smb_cmd]);
 
-               trace_smb3_slow_rsp(le16_to_cpu(midEntry->command),
-                              midEntry->mid, midEntry->pid,
+               trace_smb3_slow_rsp(smb_cmd, midEntry->mid, midEntry->pid,
                               midEntry->when_sent, midEntry->when_received);
                if (cifsFYI & CIFS_TIMER) {
                        pr_debug(" CIFS slow rsp: cmd %d mid %llu",