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authorDavidlohr Bueso <dave@stgolabs.net>2017-09-08 16:15:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:49 -0700
commit410bd5ecb276593e7ec1552014083215d4a43c3a (patch)
tree3d507f3ba123be043d8a4e7582c8a48a0f71cb07 /block/cfq-iosched.c
parentf2686bb48618718c7141f117e2d607594e959bfc (diff)
downloadlinux-0-day-410bd5ecb276593e7ec1552014083215d4a43c3a.tar.gz
linux-0-day-410bd5ecb276593e7ec1552014083215d4a43c3a.tar.xz
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 'block/cfq-iosched.c')
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