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authorDavid Howells <dhowells@redhat.com>2019-06-20 18:12:17 +0100
committerDavid Howells <dhowells@redhat.com>2019-06-20 18:12:17 +0100
commit452181936931f0f08923aba5e04e1e9ef58c389f (patch)
tree9516d468bae57461e495be640fbc7af86521cfa8 /fs/afs/server.c
parent051d25250b55c215a2254a0130d46fbd38bcbcc0 (diff)
afs: Trace afs_server usage
Add a tracepoint (afs_server) to track the afs_server object usage count. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/server.c')
-rw-r--r--fs/afs/server.c39
1 files changed, 32 insertions, 7 deletions
diff --git a/fs/afs/server.c b/fs/afs/server.c
index 52c170b59cfd..b69571bb9d37 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -17,6 +17,7 @@
static unsigned afs_server_gc_delay = 10; /* Server record timeout in seconds */
static unsigned afs_server_update_delay = 30; /* Time till VLDB recheck in secs */
+static atomic_t afs_server_debug_id;
static void afs_inc_servers_outstanding(struct afs_net *net)
{
@@ -51,7 +52,7 @@ struct afs_server *afs_find_server(struct afs_net *net,
do {
if (server)
- afs_put_server(net, server);
+ afs_put_server(net, server, afs_server_trace_put_find_rsq);
server = NULL;
read_seqbegin_or_lock(&net->fs_addr_lock, &seq);
@@ -116,7 +117,7 @@ struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uu
* changes.
*/
if (server)
- afs_put_server(net, server);
+ afs_put_server(net, server, afs_server_trace_put_uuid_rsq);
server = NULL;
read_seqbegin_or_lock(&net->fs_lock, &seq);
@@ -131,7 +132,7 @@ struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uu
} else if (diff > 0) {
p = p->rb_right;
} else {
- afs_get_server(server);
+ afs_get_server(server, afs_server_trace_get_by_uuid);
break;
}
@@ -202,7 +203,7 @@ static struct afs_server *afs_install_server(struct afs_net *net,
ret = 0;
exists:
- afs_get_server(server);
+ afs_get_server(server, afs_server_trace_get_install);
write_sequnlock(&net->fs_lock);
return server;
}
@@ -223,6 +224,7 @@ static struct afs_server *afs_alloc_server(struct afs_net *net,
goto enomem;
atomic_set(&server->usage, 1);
+ server->debug_id = atomic_inc_return(&afs_server_debug_id);
RCU_INIT_POINTER(server->addresses, alist);
server->addr_version = alist->version;
server->uuid = *uuid;
@@ -234,6 +236,7 @@ static struct afs_server *afs_alloc_server(struct afs_net *net,
spin_lock_init(&server->probe_lock);
afs_inc_servers_outstanding(net);
+ trace_afs_server(server, 1, afs_server_trace_alloc);
_leave(" = %p", server);
return server;
@@ -329,9 +332,22 @@ void afs_servers_timer(struct timer_list *timer)
}
/*
+ * Get a reference on a server object.
+ */
+struct afs_server *afs_get_server(struct afs_server *server,
+ enum afs_server_trace reason)
+{
+ unsigned int u = atomic_inc_return(&server->usage);
+
+ trace_afs_server(server, u, reason);
+ return server;
+}
+
+/*
* Release a reference on a server record.
*/
-void afs_put_server(struct afs_net *net, struct afs_server *server)
+void afs_put_server(struct afs_net *net, struct afs_server *server,
+ enum afs_server_trace reason)
{
unsigned int usage;
@@ -342,7 +358,7 @@ void afs_put_server(struct afs_net *net, struct afs_server *server)
usage = atomic_dec_return(&server->usage);
- _enter("{%u}", usage);
+ trace_afs_server(server, usage, reason);
if (likely(usage > 0))
return;
@@ -354,6 +370,8 @@ static void afs_server_rcu(struct rcu_head *rcu)
{
struct afs_server *server = container_of(rcu, struct afs_server, rcu);
+ trace_afs_server(server, atomic_read(&server->usage),
+ afs_server_trace_free);
afs_put_addrlist(rcu_access_pointer(server->addresses));
kfree(server);
}
@@ -369,7 +387,9 @@ static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
.index = alist->preferred,
.error = 0,
};
- _enter("%p", server);
+
+ trace_afs_server(server, atomic_read(&server->usage),
+ afs_server_trace_give_up_cb);
if (test_bit(AFS_SERVER_FL_MAY_HAVE_CB, &server->flags))
afs_fs_give_up_all_callbacks(net, server, &ac, NULL);
@@ -377,6 +397,8 @@ static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
wait_var_event(&server->probe_outstanding,
atomic_read(&server->probe_outstanding) == 0);
+ trace_afs_server(server, atomic_read(&server->usage),
+ afs_server_trace_destroy);
call_rcu(&server->rcu, afs_server_rcu);
afs_dec_servers_outstanding(net);
}
@@ -396,6 +418,7 @@ static void afs_gc_servers(struct afs_net *net, struct afs_server *gc_list)
write_seqlock(&net->fs_lock);
usage = 1;
deleted = atomic_try_cmpxchg(&server->usage, &usage, 0);
+ trace_afs_server(server, usage, afs_server_trace_gc);
if (deleted) {
rb_erase(&server->uuid_rb, &net->fs_servers);
hlist_del_rcu(&server->proc_link);
@@ -518,6 +541,8 @@ static noinline bool afs_update_server_record(struct afs_fs_cursor *fc, struct a
_enter("");
+ trace_afs_server(server, atomic_read(&server->usage), afs_server_trace_update);
+
alist = afs_vl_lookup_addrs(fc->vnode->volume->cell, fc->key,
&server->uuid);
if (IS_ERR(alist)) {