From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 29 Jan 2007 20:53:07 +0100 From: Ingo Molnar Subject: Re: [PATCH] mm: remove global locks from mm/highmem.c Message-ID: <20070129195307.GA24434@elte.hu> References: <1169993494.10987.23.camel@lappy> <20070128142925.df2f4dce.akpm@osdl.org> <20070129190806.GA14353@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org Return-Path: To: Hugh Dickins Cc: Andrew Morton , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: * Hugh Dickins wrote: > > For every 64-bit Fedora box there's more than seven 32-bit boxes. I > > think 32-bit is going to live with us far longer than many thought, > > so we might as well make it work better. Both HIGHMEM and HIGHPTE is > > the default on many distro kernels, which pushes the kmap > > infrastructure quite a bit. > > But HIGHPTE uses kmap_atomic (in mainline: does -rt use kmap there?) The contention i saw was on mainline and in the pagecache uses of kmap(). With HIGHPTE i only meant that typically every available highmem option is enabled on 32-bit distro kernel rpms, to make it work on as wide selection of hardware as possible. Sometimes PAE is split into a separate rpm, but mostly there's just one 32-bit kernel. Ingo -- 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: email@kvack.org