From: Mel Gorman <mgorman@techsingularity.net>
To: Tibor Bana <bana.tibor@gmail.com>
Cc: valdis.kletnieks@vt.edu, Jan Kara <jack@suse.cz>,
Pavel Machek <pavel@ucw.cz>,
kernel list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
vbabka@suse.cz, aarcange@redhat.com, rientjes@google.com,
mhocko@kernel.org, zi.yan@cs.rutgers.edu, hannes@cmpxchg.org
Subject: Re: [regression -next0117] What is kcompactd and why is he eating 100% of my cpu?
Date: Tue, 26 Jan 2021 09:17:37 +0000 [thread overview]
Message-ID: <20210126091737.GA3592@techsingularity.net> (raw)
In-Reply-To: <20210125195438.c8d0e7980da0c2931d4f3056@gmail.com>
On Mon, Jan 25, 2021 at 07:54:38PM +0100, Tibor Bana wrote:
> Greetings!
>
> I don't know if it still actual, but I am strugling with this problem right now and searching the internet for solutions.
> I read the thread and saw that you are strugling to reproduce the problem, and I can reproduce it almost every day.
>
> - Install vmware player, and a linux guest.
> - Configure the virtual machine to have a good amount of memory and cpu
> - run resource intensive tasks on the guest
> - when the host used up almost it's all memory and start to reuse caches kcompactd will kick in.
>
> As I know the problem is related to transparent huge pages, but I tried to disable it.
> Today I saw the problem again and kcompactd shown an interesting status in top. It hasn't used any memory, all zeroes but it used up one core completely.
>
> My machine is a core-i7 with 4 physical cores and hyper threading and 24GB Memory
> 5.9.11-arch2-1 #1 SMP PREEMPT Sat, 28 Nov 2020 02:07:22 +0000 x86_64 GNU/Linux
>
> Hope this can help, to point out the problem.
>
Is 5.10.10 affected because it included two patches related to halting
compaction that are relevant.
d20bdd571ee5c9966191568527ecdb1bd4b52368 mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate
38935861d85a4d9a353d1dd5a156c97700e2765d mm/compaction: count pages and stop correctly during page isolation
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2021-01-26 18:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-26 20:00 [regression -next0117] What is kcompactd and why is he eating 100% of my cpu? Pavel Machek
2019-01-27 2:56 ` valdis.kletnieks
2019-01-27 14:09 ` Mel Gorman
2019-01-27 14:15 ` Mel Gorman
2019-01-27 16:00 ` Pavel Machek
2019-01-27 21:36 ` valdis.kletnieks
2019-01-28 9:16 ` Jan Kara
2019-01-28 10:57 ` Sergey Senozhatsky
2019-01-28 11:03 ` Mel Gorman
2019-01-30 1:06 ` valdis.kletnieks
2019-01-30 4:29 ` valdis.kletnieks
2019-01-30 10:40 ` Mel Gorman
2021-01-25 18:54 ` Tibor Bana
2021-01-26 8:52 ` Valdis Klētnieks
2021-01-26 9:17 ` Mel Gorman [this message]
2021-01-27 19:29 ` Tibor Bana
2021-02-16 12:36 ` Jason A. Donenfeld
2021-02-16 22:33 ` Valdis Klētnieks
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