Messages in this thread | | | Date | Wed, 10 Sep 2003 13:46:57 +0530 | From | Ravikiran G Thirumalai <> | Subject | How reliable is SLAB_HWCACHE_ALIGN? |
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I was assuming that if you create a slab cache with SLAB_HWCACHE_ALIGN, objects are guaranteed to be aligned to L1 cacheline. But this piece of code in kmem_cache_create has raised doubts.
---------------------------------------------------------------------------- if (flags & SLAB_HWCACHE_ALIGN) { /* Need to adjust size so that objs are cache aligned. */ /* Small obj size, can get at least two per cache line. */ while (size < align/2) align /= 2; size = (size+align-1)&(~(align-1)); } ----------------------------------------------------------------------------
Am I missing something or can there really be two objects on the same cacheline even when SLAB_HWCACHE_ALIGN is specified?
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