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

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  Re: [PATCH v2 4/6] slab: add SLAB_ACCOUNT flag Johannes Weiner <hannes@cmpxchg.org> - 2015-11-19 20:10 +0100

#1273413 — Re: [PATCH v2 4/6] slab: add SLAB_ACCOUNT flag

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).
> 
> Suggested-by: Tejun Heo <tj@kernel.org>
> Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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