Date: Fri, 15 Jun 2018 04:40:22 -0400 From: Mark Johnston <markj@freebsd.org> To: Kevin Lo <kevlo@freebsd.org> Cc: Lev Serebryakov <lev@freebsd.org>, gljennjohn@gmail.com, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: swapping is completely broken in -CURRENT r334649? Message-ID: <20180615084022.GA32922@pesky.lan> In-Reply-To: <20180615051025.GA79327@ns.kevlo.org> References: <d3ee2b8f-bdbe-ce25-f496-6267f9bb0212@FreeBSD.org> <20180605181716.73b8ea91@ernst.home> <2925b27f-43cf-8813-eaa7-4f3d12bef8f0@FreeBSD.org> <20180605214808.GA94301@pesky> <20180615051025.GA79327@ns.kevlo.org>
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On Fri, Jun 15, 2018 at 01:10:25PM +0800, Kevin Lo wrote: > On Tue, Jun 05, 2018 at 05:48:08PM -0400, Mark Johnston wrote: > > > > On Wed, Jun 06, 2018 at 12:22:08AM +0300, Lev Serebryakov wrote: > > > On 05.06.2018 19:17, Gary Jennejohn wrote: > > > > > > > > > > I complained about this also and alc@ gave me this hint: > > > > sysctl vm.pageout_update_period=0 > > > > > > Really, situation is worse than stated in subject, because processes > > > are being killed AFTER memory pressure, when here are a lot of free > > > memory already! > > > > > > It looks like very serious bug. > > > > The issue was identified earlier this week and is being worked on. It's > > a regression from r329882 which appears only on certain hardware. You > > can probably work around it by setting vm.pageout_oom_seq to a large > > value (try 1000 for instance), though this will make the "true" OOM > > killer take longer to kick in. The problem is unrelated to the > > pageout_update_period. > > I have a large swap space and I've encountered this issue as well > > pid 90707 (getty), uid 0, was killed: out of swap space > pid 90709 (getty), uid 0, was killed: out of swap space > pid 90709 (getty), uid 0, was killed: out of swap space > ... > > Setting vm.pageout_oom_seq to 1000 doesn't help. If you have a patch I'll be > happy to test it, thanks. The change was committed as r334752. Are you seeing unexpected OOM kills on or after that revision?
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