GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

fanotify: reduce event objectid to 29-bit hash

Browse source 
objectid is only used by fanotify backend and it is just an optimization
for event merge before comparing all fields in event.

Move the objectid member from common struct fsnotify_event into struct
fanotify_event and reduce it to 29-bit hash to cram it together with the
3-bit event type.

Events of different types are never merged, so the combination of event
type and hash form a 32-bit key for fast compare of events.

This reduces the size of events by one pointer and paves the way for
adding hashed queue support for fanotify.

Link: https://lore.kernel.org/r/20210304104826.3993892-3-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2021-03-04 12:48:23 +02:00 • committed by Jan Kara
parent 6f73171e19
commit 8988f11abb
5 changed files with 28 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/linux/fsnotify_backend.h
View file

@ -167,7 +167,6 @@ struct fsnotify_ops {
*/
struct fsnotify_event {
struct list_head list;
unsigned long objectid; /* identifier for queue merges */
};
/*
@ -582,11 +581,9 @@ extern void fsnotify_put_mark(struct fsnotify_mark *mark);
extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
static inline void fsnotify_init_event(struct fsnotify_event *event,
unsigned long objectid)
static inline void fsnotify_init_event(struct fsnotify_event *event)
{
INIT_LIST_HEAD(&event->list);
event->objectid = objectid;
}
#else