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| author |   Davidlohr Bueso <dave@stgolabs.net> | 2017-09-08 16:15:15 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:49 -0700 |
| commit | 410bd5ecb276593e7ec1552014083215d4a43c3a (patch) | |
| tree | 3d507f3ba123be043d8a4e7582c8a48a0f71cb07 /fs/proc/internal.h | |
| parent | lib/interval-tree: correct comment wrt generic flavor (diff) | |
| download | linux-dev-410bd5ecb276593e7ec1552014083215d4a43c3a.tar.xz linux-dev-410bd5ecb276593e7ec1552014083215d4a43c3a.zip | |
procfs: use faster rb_first_cached()
... such that we can avoid the tree walks to get the node with the
smallest key. Semantically the same, as the previously used rb_first(),
but O(1). The main overhead is the extra footprint for the cached rb_node
pointer, which should not matter for procfs.
Link: http://lkml.kernel.org/r/20170719014603.19029-14-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/internal.h')
| -rw-r--r-- | fs/proc/internal.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 2cbfcd32e884..a34195e92b20 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -40,7 +40,7 @@ struct proc_dir_entry { const struct inode_operations *proc_iops; const struct file_operations *proc_fops; struct proc_dir_entry *parent; - struct rb_root subdir; + struct rb_root_cached subdir; struct rb_node subdir_node; void *data; atomic_t count; /* use count */ |