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authorSteve French <stfrench@microsoft.com>2019-09-09 22:57:11 -0500
committerSteve French <stfrench@microsoft.com>2019-09-16 11:43:38 -0500
commit1b63f1840e787516bf2d3e5c27c2d22fe23cfb37 (patch)
tree7e3413e58f1cf0a5bd3b577dfbee90b365a7b9cf
parentsmb3: only offload decryption of read responses if multiple requests (diff)
downloadlinux-dev-1b63f1840e787516bf2d3e5c27c2d22fe23cfb37.tar.xz
linux-dev-1b63f1840e787516bf2d3e5c27c2d22fe23cfb37.zip
smb3: display max smb3 requests in flight at any one time
Displayed in /proc/fs/cifs/Stats once for each socket we are connected to. This allows us to find out what the maximum number of requests that had been in flight (at any one time). Note that /proc/fs/cifs/Stats can be reset if you want to look for maximum over a small period of time. Sample output (immediately after mount): 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 Operations (MIDs): 0 0 session 0 share reconnects Total vfs operations: 5 maximum at one time: 2 Max requests in flight: 2 1) \\localhost\scratch SMBs: 18 Bytes read: 0 Bytes written: 0 ... Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to '')
-rw-r--r--fs/cifs/cifs_debug.c2
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/connect.c1
-rw-r--r--fs/cifs/smb2ops.c2
-rw-r--r--fs/cifs/transport.c4
5 files changed, 10 insertions, 0 deletions
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index a38d796f5ffe..0b4eee3bed66 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -452,6 +452,7 @@ 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);
+ server->max_in_flight = 0;
#ifdef CONFIG_CIFS_STATS2
for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
atomic_set(&server->num_cmds[i], 0);
@@ -526,6 +527,7 @@ 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);
+ seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
#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);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 6987fbc5a24a..ef2199913217 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -677,6 +677,7 @@ struct TCP_Server_Info {
unsigned int credits; /* send no more requests at once */
unsigned int max_credits; /* can override large 32000 default at mnt */
unsigned int in_flight; /* number of requests on the wire to server */
+ unsigned int max_in_flight; /* max number of requests that were on wire */
spinlock_t req_lock; /* protect the two values above */
struct mutex srv_mutex;
struct task_struct *tsk;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index e70112d67b0e..df1ccb581828 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2728,6 +2728,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
tcp_ses->rdma = volume_info->rdma;
tcp_ses->in_flight = 0;
+ tcp_ses->max_in_flight = 0;
tcp_ses->credits = 1;
init_waitqueue_head(&tcp_ses->response_q);
init_waitqueue_head(&tcp_ses->request_q);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 72b3e39d7f4f..9b74149b471f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -203,6 +203,8 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
credits->instance = server->reconnect_instance;
server->credits -= credits->value;
server->in_flight++;
+ if (server->in_flight > server->max_in_flight)
+ server->max_in_flight = server->in_flight;
break;
}
}
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 4fccb90492e9..308ad0f495e1 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -532,6 +532,8 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) {
/* oplock breaks must not be held up */
server->in_flight++;
+ if (server->in_flight > server->max_in_flight)
+ server->max_in_flight = server->in_flight;
*credits -= 1;
*instance = server->reconnect_instance;
spin_unlock(&server->req_lock);
@@ -608,6 +610,8 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) {
*credits -= num_credits;
server->in_flight += num_credits;
+ if (server->in_flight > server->max_in_flight)
+ server->max_in_flight = server->in_flight;
*instance = server->reconnect_instance;
}
spin_unlock(&server->req_lock);