Messages in this thread | | | Date | Tue, 11 May 2010 09:42:03 +0300 | Subject | Re: [PATCH v3] ad7877: keep dma rx buffers in seperate cache lines | From | Pekka Enberg <> |
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Hi Dmitry,
On Tue, May 11, 2010 at 9:33 AM, Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote: >> what guarantee exactly do you have for that statement ? > > The data is kmalloced, kmalloc aligns on cacheline boundary AFAIK which > means that next kmalloc data chunk will not share "our" cacheline.
No, there are no such guarantees. kmalloc() aligns on ARCH_KMALLOC_MINALIGN or ARCH_SLAB_MINALIGN depending on which is bigger but beyond that, there are no guarantees. You can, of course, use kmem_cache_create() with SLAB_HWCACHE_ALIGN to align on cacheline boundary.
Pekka
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