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Date: Wed, 26 Sep 2012 18:12:30 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Christoph Lameter <cl@...ux.com> cc: Glauber Costa <glommer@...allels.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>, Pekka Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH] slab: Ignore internal flags in cache creation On Wed, 26 Sep 2012, Christoph Lameter wrote: > > Nack, this is already handled by CREATE_MASK in the mm/slab.c allocator; > > CREATE_MASK defines legal flags that can be specified. Other flags cause > and error. This is about flags that are internal that should be ignored > when specified. > That should be ignored for the mm/slab.c allocator, yes. > I think it makes sense to reserve some top flags for internal purposes. > It depends on the implementation: if another slab allocator were to use additional bits that would be a no-op with mm/slab.c, then this patch would be too restrictive. There's also no requirement that any "internal flags" reserved by a slab allocator implementation must be shared in the same kmem_cache field as the flags passed to kmem_cache_create() -- it's actually better if they aren't since they seldom need to be accessed in the same cacheline. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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