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Re: [PATCH v5] slab: Ignore internal flags in cache creation [message #48686 is a reply to message #48432] Wed, 31 October 2012 07:13 Go to previous messageGo to previous message
Pekka Enberg is currently offline  Pekka Enberg
Messages: 22
Registered: November 2006
Junior Member
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On Thu, Oct 18, 2012 at 12:07 AM, David Rientjes <> wrote:
> On Wed, 17 Oct 2012, Glauber Costa wrote:
>> Some flags are used internally by the allocators for management
>> purposes. One example of that is the CFLGS_OFF_SLAB flag that slab uses
>> to mark that the metadata for that cache is stored outside of the slab.
>> No cache should ever pass those as a creation flags. We can just ignore
>> this bit if it happens to be passed (such as when duplicating a cache in
>> the kmem memcg patches).
>> Because such flags can vary from allocator to allocator, we allow them
>> to make their own decisions on that, defining SLAB_AVAILABLE_FLAGS with
>> all flags that are valid at creation time. Allocators that doesn't have
>> any specific flag requirement should define that to mean all flags.
>> Common code will mask out all flags not belonging to that set.
>> [ v2: leave the mask out decision up to the allocators ]
>> [ v3: define flags for all allocators ]
>> [ v4: move all definitions to slab.h ]
>> Signed-off-by: Glauber Costa <>
>> Acked-by: Christoph Lameter <>
>> CC: David Rientjes <>
>> CC: Pekka Enberg <>
> Acked-by: David Rientjes <>

Applied, thanks!
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