Date: Mon, 18 Mar 2019 17:37:10 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD Current <freebsd-current@FreeBSD.org> Subject: Re: leaked swap? Message-ID: <2f644795-abe6-da6d-6019-05cd3dd84380@FreeBSD.org> In-Reply-To: <20190318153230.GS96870@kib.kiev.ua> References: <9c5eaa94-f55b-464a-ab0f-267e7fce4bd0@FreeBSD.org> <20190318153230.GS96870@kib.kiev.ua>
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On 18/03/2019 17:32, Konstantin Belousov wrote: > On Mon, Mar 18, 2019 at 05:20:35PM +0200, Andriy Gapon 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). >> 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). >> 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. So, >> there was no real hardware reboot and the kernel kept running. However, all >> userland processes were terminated. >> >> To my surprise, even while in the single-user mode the swap utilization didn't >> go below 70%. Also, laundry memory remained in multi-GB area, but let's ignore >> this for now. >> >> 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. >> Does anyone have any ideas? >> Maybe that's something that has already been fixed? >> If not, any ideas on what to look for? > tmpfs, swap-backed (or even memory backed) md, persistent posix shared > memory, SysV shared memory. > Thank you. There is a single tmpfs mount: $ df -t tmpfs -h Filesystem Size Used Avail Capacity Mounted on tmpfs 1.0G 4.0K 1.0G 0% /tmp/tmp No md devices at all according to mdconfig. Not sure how to check for the shared memory though. -- Andriy Gapon
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