From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [PATCH 0/8] Create ZONE_MOVABLE to partition memory between movable and non-movable pages From: Peter Zijlstra In-Reply-To: <20070129160921.7b362c8d.akpm@osdl.org> References: <20070125234458.28809.5412.sendpatchset@skynet.skynet.ie> <20070126030753.03529e7a.akpm@osdl.org> <20070126114615.5aa9e213.akpm@osdl.org> <20070126122747.dde74c97.akpm@osdl.org> <20070129143654.27fcd4a4.akpm@osdl.org> <20070129225000.GG6602@flint.arm.linux.org.uk> <20070129160921.7b362c8d.akpm@osdl.org> Content-Type: text/plain Date: Tue, 30 Jan 2007 10:53:43 +0100 Message-Id: <1170150823.6189.203.camel@twins> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Christoph Lameter , Russell King , Mel Gorman , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter List-ID: On Mon, 2007-01-29 at 16:09 -0800, Andrew Morton wrote: > On Mon, 29 Jan 2007 15:37:29 -0800 (PST) > Christoph Lameter wrote: > > > With a alloc_pages_range() one would be able to specify upper and lower > > boundaries. > > Is there a proposal anywhere regarding how this would be implemented? I'm guessing this will involve page migration. Still, would we need to place bounds on non movable pages, or will it be a best effort? It seems the current zone approach is a best effort too, although it does try to keep allocations away from the lower zones as much as possible. But I guess we could make a single zone allocator prefer high addresses too. So then we'd end up with a single zone, and each allocation would give a range. Try and pick a free page with as high an address as possible in the given range. If no pages available in the given range try and move some movable pages out of it. This does of course involve finding free pages in a given range, and identifying pages as movable. And a gazillion trivial but tedious things I've forgotten. Christoph, is this what you were getting at? -- 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