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Message-ID: <4A95602A.5040109@vflare.org> Date: Wed, 26 Aug 2009 21:47:46 +0530 From: Nitin Gupta <ngupta@...are.org> To: Christoph Lameter <cl@...ux-foundation.org> CC: Hugh Dickins <hugh.dickins@...cali.co.uk>, Pekka Enberg <penberg@...helsinki.fi>, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-mm-cc@...top.org Subject: Re: [PATCH 1/4] compcache: xvmalloc memory allocator On 08/26/2009 09:40 PM, Christoph Lameter wrote: > On Wed, 26 Aug 2009, Nitin Gupta wrote: > >> I went crazy. I meant 40 bits for PFN -- not 48. This 40-bit PFN should be >> sufficient for all archs. For archs where 40 + PAGE_SHIFT< MAX_PHYSMEM_BITS >> ramzswap will just issue a compiler error. > > How about restricting the xvmalloc memory allocator to 32 bit? If I > understand correctly xvmalloc main use in on 32 bit in order to be > able to use HIGHMEM? > > I have just replaced all PFN usage with struct page in xvmalloc. The main use of xvmalloc is not just the use of HIGHMEM -- its just one of the things. Other reasons are: - O(1) alloc/free - Low fragmentation - Allocates 0-order pages to expand pools Following gives more information: http://code.google.com/p/compcache/wiki/xvMalloc http://code.google.com/p/compcache/wiki/xvMallocPerformance Thanks, Nitin -- 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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