From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 17 Apr 2004 11:28:38 -0700 From: Marc Singer Subject: Re: Might refill_inactive_zone () be too aggressive? Message-ID: <20040417182838.GA3856@flea> References: <20040417060920.GC29393@flea> <20040417061847.GC743@holomorphy.com> <20040417175723.GA3235@flea> <20040417181042.GM743@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040417181042.GM743@holomorphy.com> Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III , Marc Singer , linux-mm@kvack.org List-ID: On Sat, Apr 17, 2004 at 11:10:42AM -0700, William Lee Irwin III wrote: > On Sat, Apr 17, 2004 at 10:57:24AM -0700, Marc Singer wrote: > > I don't think that's the whole story. I printed distress, > > mapped_ratio, and swappiness when vmscan starts trying to reclaim > > mapped pages. > > reclaim_mapped: distress 50 mapped_ratio 0 swappiness 60 > > 50 + 60 > 100 > > So, part of the problem is swappiness. I could set that value to 25, > > for example, to stop the machine from swapping. > > I'd be fine stopping here, except for you comment about what > > swappiness means. In my case, nearly none of memory is mapped. It is > > zone priority which has dropped to 1 that is precipitating the > > eviction. Is this what you expect and want? > > I'm not sure it's expected. Maybe this patch fares better? Ah, that's a much different thing. That works for me. Is that something you'd want to put into the kernel? > > > -- wli > > > Index: singer-2.6.5-mm6/mm/vmscan.c > =================================================================== > --- singer-2.6.5-mm6.orig/mm/vmscan.c 2004-04-14 23:21:19.000000000 -0700 > +++ singer-2.6.5-mm6/mm/vmscan.c 2004-04-17 11:09:35.000000000 -0700 > @@ -636,7 +636,7 @@ > * > * A 100% value of vm_swappiness overrides this algorithm altogether. > */ > - swap_tendency = mapped_ratio / 2 + distress + vm_swappiness; > + swap_tendency = mapped_ratio / 2 + max(distress, vm_swappiness); > > /* > * Now use this metric to decide whether to start moving mapped memory -- 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