linux-kernel - Re: [PATCHv4 0/4] zsmalloc: fine-grained fullness and new compaction algorithm

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Date:   Sun, 16 Apr 2023 20:55:19 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv4 0/4] zsmalloc: fine-grained fullness and new compaction algorithm

On Sun, Apr 16, 2023 at 8:44 PM Sergey Senozhatsky
<senozhatsky@...omium.org> wrote:
>
> On (23/04/16 13:27), Yu Zhao wrote:
> > > Hi,
> > >
> > > Did you bisect it down to this series?
> >
> > Not exactly -- since this series was the only suspect I had, I cherry
> > picked it to v6.3-rc6 and verified it is the culprit.
>
> Can't reproduce it yet. One of the theories is that get_fullness_group()
> maybe returns an invalid index, but I don't immediately see how would it
> do so.
>
> Is the problem reproducible?

Whenever swapping *multithreaded* heavily.

> Do you run some specific test?

E.g.,
  tools/testing/selftests/kvm/max_guest_memory_test -c 112 -m 800 -s 800
with 112 CPUs and ~770GB DRAM + 32GB zram.