Re: [PATCH v2 4/6] slab: add SLAB_ACCOUNT flag

From: Tejun Heo
Date: Tue Nov 10 2015 - 13:38:16 EST

On Tue, Nov 10, 2015 at 09:34:05PM +0300, Vladimir Davydov wrote:
> Currently, if we want to account all objects of a particular kmem cache,
> we have to pass __GFP_ACCOUNT to each kmem_cache_alloc call, which is
> inconvenient. This patch introduces SLAB_ACCOUNT flag which if passed to
> kmem_cache_create will force accounting for every allocation from this
> cache even if __GFP_ACCOUNT is not passed.
> This patch does not make any of the existing caches use this flag - it
> will be done later in the series.
> Note, a cache with SLAB_ACCOUNT cannot be merged with a cache w/o
> SLAB_ACCOUNT, i.e. using this flag will probably reduce the number of
> merged slabs even if kmem accounting is not used (only compiled in).

Am I correct in thinking that we should eventually be able to removed
__GFP_ACCOUNT and that only caches explicitly marked with SLAB_ACCOUNT
would need to be handled by kmemcg?

Thanks a lot for doing this!

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