From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <41F54CBC.9030606@colorfullife.com> Date: Mon, 24 Jan 2005 20:30:04 +0100 From: Manfred Spraul MIME-Version: 1.0 Subject: Re: [PATCH] Make slab use alloc_pages directly References: <20050124165412.GL31455@parcelfarce.linux.theplanet.co.uk> In-Reply-To: <20050124165412.GL31455@parcelfarce.linux.theplanet.co.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Matthew Wilcox Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, dhowells@redhat.com List-ID: Matthew Wilcox wrote: >__get_free_pages() calls alloc_pages, finds the page_address() and >throws away the struct page *. Slab then calls virt_to_page to get it >back again. Much more efficient for slab to call alloc_pages itself, >as well as making the NUMA and non-NUMA cases more similarr to each other. > >Signed-off-by: Matthew Wilcox > > > Signed-off-by: Manfred Spraul >Index: linux-2.6/mm/slab.c >=================================================================== >RCS file: /var/cvs/linux-2.6/mm/slab.c,v >retrieving revision 1.29 >diff -u -p -r1.29 slab.c >--- linux-2.6/mm/slab.c 12 Jan 2005 20:18:07 -0000 1.29 >+++ linux-2.6/mm/slab.c 24 Jan 2005 16:47:02 -0000 >@@ -894,16 +894,13 @@ static void *kmem_getpages(kmem_cache_t > > flags |= cachep->gfpflags; > if (likely(nodeid == -1)) { >- addr = (void*)__get_free_pages(flags, cachep->gfporder); >- if (!addr) >- return NULL; >- page = virt_to_page(addr); >+ page = alloc_pages(flags, cachep->gfporder); > } else { > page = alloc_pages_node(nodeid, flags, cachep->gfporder); >- if (!page) >- return NULL; >- addr = page_address(page); > } >+ if (!page) >+ return NULL; >+ addr = page_address(page); > > i = (1 << cachep->gfporder); > if (cachep->flags & SLAB_RECLAIM_ACCOUNT) > > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org