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| author | David Howells <dhowells@redhat.com> | 2018-04-04 13:41:27 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-04-04 13:41:27 +0100 |
| commit | a18feb55769b705a44c4107786c4045eae2e87b6 (patch) | |
| tree | 3db7d160e672aa9f16a0437b767b3d3bbb10ecc8 /fs/fscache/internal.h | |
| parent | 2c98425720233ae3e135add0c7e869b32913502f (diff) | |
| download | lwn-a18feb55769b705a44c4107786c4045eae2e87b6.tar.gz lwn-a18feb55769b705a44c4107786c4045eae2e87b6.zip | |
fscache: Add tracepoints
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>
Diffstat (limited to 'fs/fscache/internal.h')
| -rw-r--r-- | fs/fscache/internal.h | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h index 0ff4b49a0037..c27e2db3004e 100644 --- a/fs/fscache/internal.h +++ b/fs/fscache/internal.h @@ -29,6 +29,7 @@ #define pr_fmt(fmt) "FS-Cache: " fmt #include <linux/fscache-cache.h> +#include <trace/events/fscache.h> #include <linux/sched.h> #define FSCACHE_MIN_THREADS 4 @@ -49,7 +50,8 @@ extern struct fscache_cache *fscache_select_cache_for_object( extern struct kmem_cache *fscache_cookie_jar; extern void fscache_cookie_init_once(void *); -extern void __fscache_cookie_put(struct fscache_cookie *); +extern void fscache_cookie_put(struct fscache_cookie *, + enum fscache_cookie_trace); /* * fsdef.c @@ -311,14 +313,12 @@ static inline void fscache_raise_event(struct fscache_object *object, fscache_enqueue_object(object); } -/* - * drop a reference to a cookie - */ -static inline void fscache_cookie_put(struct fscache_cookie *cookie) +static inline void fscache_cookie_get(struct fscache_cookie *cookie, + enum fscache_cookie_trace where) { - BUG_ON(atomic_read(&cookie->usage) <= 0); - if (atomic_dec_and_test(&cookie->usage)) - __fscache_cookie_put(cookie); + int usage = atomic_inc_return(&cookie->usage); + + trace_fscache_cookie(cookie, where, usage); } /* |