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authorChris Metcalf <cmetcalf@tilera.com>2013-09-13 02:13:55 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-13 02:38:02 +0400
commit5fbc461636c32efdb9d5216d491d37a40d54535b (patch)
tree119599fe279ba3daf94422d54cfc7bd2a5ae4a80 /fs/bfs
parent9cb2dc1c950cf0624202c1ea2705705e1e51c278 (diff)
downloadlinux-5fbc461636c32efdb9d5216d491d37a40d54535b.tar.xz
mm: make lru_add_drain_all() selective
make lru_add_drain_all() only selectively interrupt the cpus that have per-cpu free pages that can be drained. This is important in nohz mode where calling mlockall(), for example, otherwise will interrupt every core unnecessarily. This is important on workloads where nohz cores are handling 10 Gb traffic in userspace. Those CPUs do not enter the kernel and place pages into LRU pagevecs and they really, really don't want to be interrupted, or they drop packets on the floor. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Reviewed-by: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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