Messages in this thread | | | Subject | Re: [PATCH] vmalloc: use rcu list iterator to reduce vmap_area_lock contention | From | Eric Dumazet <> | Date | Thu, 29 May 2014 05:56:05 -0700 |
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On Thu, 2014-05-29 at 15:22 +0900, Joonsoo Kim wrote: > Richard Yao reported a month ago that his system have a trouble > with vmap_area_lock contention during performance analysis > by /proc/meminfo. Andrew asked why his analysis checks /proc/meminfo > stressfully, but he didn't answer it. > > https://lkml.org/lkml/2014/4/10/416 > > Although I'm not sure that this is right usage or not, there is a solution > reducing vmap_area_lock contention with no side-effect. That is just > to use rcu list iterator in get_vmalloc_info(). This function only needs > values on vmap_area structure, so we don't need to grab a spinlock. > > Reported-by: Richard Yao <ryao@gentoo.org> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Nice, I was considering the same
Acked-by: Eric Dumazet <edumazet@google.com>
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