From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <43EB4FD5.20107@yahoo.com.au> Date: Fri, 10 Feb 2006 01:21:09 +1100 From: Nick Piggin MIME-Version: 1.0 Subject: Re: [PATCH] mm: Implement Swap Prefetching v22 References: <200602092339.49719.kernel@kolivas.org> <43EB43B9.5040001@yahoo.com.au> <200602100047.09722.kernel@kolivas.org> In-Reply-To: <200602100047.09722.kernel@kolivas.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Con Kolivas Cc: linux-kernel@vger.kernel.org, Andrew Morton , ck list , linux-mm@kvack.org, Paul Jackson List-ID: Con Kolivas wrote: > I really don't want to go throwing out pagecache without some smart semantics > and then swap in random stuff that could be crap I agree. The answer to this > is for the vm itself to have an ageing algorithm like the clockpro stuff > which does this in a smart way. It could certainly age away the updatedb > wrinkles and leave some free ram - which would help/be helped by prefetching. > AFAIK clockpro will not leave free ram, will it? Getting a little hand-wavy; I don't think the updatedb problem needs to be fixed by a really fancy page reclaim algorithm (IMO, and that's not to say that a fancy reclaim algorithm wouldn't be nice for other reasons). Just small improvements here and there, and there will always be a tradeoff between throughput and interactive pagein latency so in the end it might need a tunable (hey there is one - maybe it needs to be improved) -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com -- 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