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fscache: Add tracepoints

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Add some tracepoints to fscache:

 (*) fscache_cookie - Tracks a cookie's usage count.

 (*) fscache_netfs - Logs registration of a network filesystem, including
     the pointer to the cookie allocated.

 (*) fscache_acquire - Logs cookie acquisition.

 (*) fscache_relinquish - Logs cookie relinquishment.

 (*) fscache_enable - Logs enablement of a cookie.

 (*) fscache_disable - Logs disablement of a cookie.

 (*) fscache_osm - Tracks execution of states in the object state machine.

and cachefiles:

 (*) cachefiles_ref - Tracks a cachefiles object's usage count.

 (*) cachefiles_lookup - Logs result of lookup_one_len().

 (*) cachefiles_mkdir - Logs result of vfs_mkdir().

 (*) cachefiles_create - Logs result of vfs_create().

 (*) cachefiles_unlink - Logs calls to vfs_unlink().

 (*) cachefiles_rename - Logs calls to vfs_rename().

 (*) cachefiles_mark_active - Logs an object becoming active.

 (*) cachefiles_wait_active - Logs a wait for an old object to be
     destroyed.

 (*) cachefiles_mark_inactive - Logs an object becoming inactive.

 (*) cachefiles_mark_buried - Logs the burial of an object.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-04-04 13:41:27 +01:00
parent 2c98425720
commit a18feb5576
12 changed files with 731 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
fs/fscache/cookie.c
View File

@@ -101,7 +101,7 @@ struct fscache_cookie *__fscache_acquire_cookie(
*/
atomic_set(&cookie->n_active, 1);
atomic_inc(&parent->usage);
fscache_cookie_get(parent, fscache_cookie_get_acquire_parent);
atomic_inc(&parent->n_children);
cookie->def = def;
@@ -125,6 +125,8 @@ struct fscache_cookie *__fscache_acquire_cookie(
break;
}
trace_fscache_acquire(cookie);
if (enable) {
/* if the object is an index then we need do nothing more here
* - we create indices on disk when we need them as an index
@@ -134,7 +136,8 @@ struct fscache_cookie *__fscache_acquire_cookie(
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
} else {
atomic_dec(&parent->n_children);
__fscache_cookie_put(cookie);
fscache_cookie_put(cookie,
fscache_cookie_put_acquire_nobufs);
fscache_stat(&fscache_n_acquires_nobufs);
_leave(" = NULL");
return NULL;
@@ -159,6 +162,8 @@ void __fscache_enable_cookie(struct fscache_cookie *cookie,
{
_enter("%p", cookie);
trace_fscache_enable(cookie);
wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
TASK_UNINTERRUPTIBLE);
@@ -318,7 +323,7 @@ static int fscache_alloc_object(struct fscache_cache *cache,
* attached to the cookie */
if (fscache_attach_object(cookie, object) < 0) {
fscache_stat(&fscache_n_cop_put_object);
cache->ops->put_object(object);
cache->ops->put_object(object, fscache_obj_put_attach_fail);
fscache_stat_d(&fscache_n_cop_put_object);
}
@@ -338,7 +343,7 @@ object_already_extant:
error_put:
fscache_stat(&fscache_n_cop_put_object);
cache->ops->put_object(object);
cache->ops->put_object(object, fscache_obj_put_alloc_fail);
fscache_stat_d(&fscache_n_cop_put_object);
error:
_leave(" = %d", ret);
@@ -398,7 +403,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
/* attach to the cookie */
object->cookie = cookie;
atomic_inc(&cookie->usage);
fscache_cookie_get(cookie, fscache_cookie_get_attach_object);
hlist_add_head(&object->cookie_link, &cookie->backing_objects);
fscache_objlist_add(object);
@@ -516,6 +521,8 @@ void __fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
_enter("%p,%u", cookie, invalidate);
trace_fscache_disable(cookie);
ASSERTCMP(atomic_read(&cookie->n_active), >, 0);
if (atomic_read(&cookie->n_children) != 0) {
@@ -601,6 +608,8 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
cookie, cookie->def->name, cookie->netfs_data,
atomic_read(&cookie->n_active), retire);
trace_fscache_relinquish(cookie, retire);
/* No further netfs-accessing operations on this cookie permitted */
if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
BUG();
@@ -620,35 +629,38 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
/* Dispose of the netfs's link to the cookie */
ASSERTCMP(atomic_read(&cookie->usage), >, 0);
fscache_cookie_put(cookie);
fscache_cookie_put(cookie, fscache_cookie_put_relinquish);
_leave("");
}
EXPORT_SYMBOL(__fscache_relinquish_cookie);
/*
* destroy a cookie
* Drop a reference to a cookie.
*/
void __fscache_cookie_put(struct fscache_cookie *cookie)
void fscache_cookie_put(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
struct fscache_cookie *parent;
int usage;
_enter("%p", cookie);
for (;;) {
_debug("FREE COOKIE %p", cookie);
do {
usage = atomic_dec_return(&cookie->usage);
trace_fscache_cookie(cookie, where, usage);
if (usage > 0)
return;
BUG_ON(usage < 0);
parent = cookie->parent;
BUG_ON(!hlist_empty(&cookie->backing_objects));
kmem_cache_free(fscache_cookie_jar, cookie);
if (!parent)
break;
cookie = parent;
BUG_ON(atomic_read(&cookie->usage) <= 0);
if (!atomic_dec_and_test(&cookie->usage))
break;
}
where = fscache_cookie_put_parent;
} while (cookie);
_leave("");
}