Messages in this thread | | | Date | Fri, 21 Sep 2012 12:41:52 +0300 (EEST) | From | Pekka Enberg <> | Subject | Re: [PATCH v3 09/16] sl[au]b: always get the cache from its page in kfree |
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On Fri, 21 Sep 2012, Glauber Costa wrote: > > We should assume that most distributions enable CONFIG_MEMCG_KMEM, > > right? Therfore, any performance impact should be dependent on whether > > or not kmem memcg is *enabled* at runtime or not. > > > > Can we use the "static key" thingy introduced by tracing folks for this? > > Yes. > > I am already using static keys extensively in this patchset, and that is > how I intend to handle this particular case.
Cool.
The key point here is that !CONFIG_MEMCG_KMEM should have exactly *zero* performance impact and CONFIG_MEMCG_KMEM disabled at runtime should have absolute minimal impact.
Pekka
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