Date: Mon, 18 Mar 2019 08:30:42 -0700 From: Cy Schubert <Cy.Schubert@cschubert.com> To: freebsd-current@freebsd.org, Andriy Gapon <avg@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org> Subject: Re: leaked swap? Message-ID: <A0A81BBF-AA4B-4469-8117-8D0AD7399854@cschubert.com> In-Reply-To: <9c5eaa94-f55b-464a-ab0f-267e7fce4bd0@FreeBSD.org> References: <9c5eaa94-f55b-464a-ab0f-267e7fce4bd0@FreeBSD.org>
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On March 18, 2019 8:20:35 AM PDT, Andriy Gapon <avg@FreeBSD=2Eorg> wrote: > >First, a note that this was observed on a system that runs a fairly old >current >(~ 1 year old) with a fairly long uptime (> 6 months)=2E >I noticed that the system was nearly out of memory, 98% of swap was in >use, >there was less than 1 GB of free memory, several GBs of each of active, >inactive >and laundry memory, and many GBs of wired (mostly ZFS)=2E >I decided to pro-actively reboot the system, but to speed that up I put >the >system to the single-user mode (via shutdown) and then back to >multi-user=2E So, >there was no real hardware reboot and the kernel kept running=2E=20 >However, all >userland processes were terminated=2E > >To my surprise, even while in the single-user mode the swap utilization >didn't >go below 70%=2E Also, laundry memory remained in multi-GB area, but >let's ignore >this for now=2E > >I think that the swap could be used only for anonymous memory, so I >expected it >go to zero after the shutdown to the single user mode=2E >Does anyone have any ideas? >Maybe that's something that has already been fixed? >If not, any ideas on what to look for? >Thanks! I've had a hunch of this but haven't gone down this rabbit hole to investi= gate=2E Related, yesterday I performed a git gc --aggressive=2E Top did not= report any swap used by git and GB of swap were used=2E I think to help ad= dress this we need a reliable reporting tool=2E Obviously two separate symp= toms, not sure if the same cause=2E --=20 Pardon the typos and autocorrect, small keyboard in use=2E Cheers, Cy Schubert <Cy=2ESchubert@cschubert=2Ecom> FreeBSD UNIX: <cy@FreeBSD=2Eorg> Web: http://www=2EFreeBSD=2Eorg The need of the many outweighs the greed of the few=2E
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