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Date: Thu, 28 Oct 2010 09:52:58 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: Pawan Singh <pawan@...ger.org> Cc: linux-kernel@...r.kernel.org Subject: Re: Tweaking swap algorithm under constrained memory usage On Wed, 27 Oct 2010 11:41:18 -0700 Pawan Singh <pawan@...ger.org> wrote: > I have a requirement where a user space process needs to allocate 75% > of the memory on the machine and keep it locked i.e. not swappable. > Other processes need to share the rest of the memory. Swap is enabled. > I was wondering what tweaks would be required so that the swapping > alogrithms' thresholds are based on 25% of the memory rather than on > 100% of the memory. If I leave this at default, kswapd may decide to > swap a lot more pages than really required because 75% of pages are > locked. I am working on 2.6.22 kernel. I can use "swappiness" factor > and reduce it - but I wanted to know if I can alter something > fundamental in the kernel code to make life for rest of the processes > better. > > Thanks for any suggestions. > Recent kernel (2.6.28-) has splited LRUs as - active/inactive ANON - active/inactive FILE - LOCKED (UNEVICTABLE) ---(new) Then, try the new kernel is a choice. Thanks, -Kame -- 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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