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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
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18
include/linux/fscache-cache.h
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@@ -29,6 +29,18 @@ struct fscache_cache_ops;
struct fscache_object;
struct fscache_operation;
enum fscache_obj_ref_trace {
fscache_obj_get_add_to_deps,
fscache_obj_get_queue,
fscache_obj_put_alloc_fail,
fscache_obj_put_attach_fail,
fscache_obj_put_drop_obj,
fscache_obj_put_enq_dep,
fscache_obj_put_queue,
fscache_obj_put_work,
fscache_obj_ref__nr_traces
};
/*
* cache tag definition
*/
@@ -231,7 +243,8 @@ struct fscache_cache_ops {
void (*lookup_complete)(struct fscache_object *object);
/* increment the usage count on this object (may fail if unmounting) */
struct fscache_object *(*grab_object)(struct fscache_object *object);
struct fscache_object *(*grab_object)(struct fscache_object *object,
enum fscache_obj_ref_trace why);
/* pin an object in the cache */
int (*pin_object)(struct fscache_object *object);
@@ -254,7 +267,8 @@ struct fscache_cache_ops {
void (*drop_object)(struct fscache_object *object);
/* dispose of a reference to an object */
void (*put_object)(struct fscache_object *object);
void (*put_object)(struct fscache_object *object,
enum fscache_obj_ref_trace why);
/* sync a cache */
void (*sync_cache)(struct fscache_cache *cache);