From: Jianlin Lv <iecedge@gmail.com>
To: "Huang, Ying" <ying.huang@intel.com>
Cc: tj@kernel.org, lizefan.x@bytedance.com, hannes@cmpxchg.org,
corbet@lwn.net, mhocko@kernel.org, roman.gushchin@linux.dev,
shakeelb@google.com, muchun.song@linux.dev,
akpm@linux-foundation.org, yosryahmed@google.com,
willy@infradead.org, linmiaohe@huawei.com,
wangkefeng.wang@huawei.com, laoar.shao@gmail.com,
yuzhao@google.com, wuyun.abel@bytedance.com, david@redhat.com,
peterx@redhat.com, vishal.moola@gmail.com, hughd@google.com,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
jianlv@ebay.com
Subject: Re: [PATCH] memcg: add interface to force disable swap
Date: Sun, 8 Oct 2023 17:34:44 +0800 [thread overview]
Message-ID: <CAFA-uR9n-rKw4k26Bhm=P16jOMtAncRsno7o=yYJ1kTxmB_mRw@mail.gmail.com> (raw)
In-Reply-To: <87il7hjzdp.fsf@yhuang6-desk2.ccr.corp.intel.com>
On Sun, Oct 8, 2023 at 4:26 PM Huang, Ying <ying.huang@intel.com> wrote:
>
> Jianlin Lv <iecedge@gmail.com> writes:
>
> > On Sun, Oct 8, 2023 at 9:17 AM Huang, Ying <ying.huang@intel.com> wrote:
> >>
> >> Jianlin Lv <iecedge@gmail.com> writes:
> >>
> >> > From: Jianlin Lv <iecedge@gmail.com>
> >> >
> >> > Global reclaim will swap even if swappiness is set to 0.
> >>
> >> Why? Can you elaborate the situation?
> >
> > We reproduced the issue of pages being swapped out even when swappiness is
> > set to 0 in the production environment through the following test program.
> > Not sure whether this program can reproduce the issue in any environment.
> >
> > From the implementation of the get_scan_count code, it can be seen that,
> > based on the current runtime situation, memory reclamation will choose a
> > scanning method (SCAN_ANON/SCAN_FILE/SCAN_FRACT) to determine how
> > aggressively the anon and file LRU are scanned. However, this introduces
> > uncertainty.
> >
> > For the JVM issue at hand, we expect deterministic SCAN_FILE scan to avoid
> > swapping out anon pages.
>
> Why doesn't memory.swap.max work?
The main reason is that deployed nodes are kept on cgroups v1.
>
> --
> Best Regards,
> Huang, Ying
next prev parent reply other threads:[~2023-10-08 9:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-07 13:09 Jianlin Lv
2023-10-08 1:14 ` Huang, Ying
2023-10-08 7:52 ` Jianlin Lv
2023-10-08 8:24 ` Huang, Ying
2023-10-08 9:34 ` Jianlin Lv [this message]
2023-10-09 5:58 ` Huang, Ying
2023-10-09 7:34 ` Michal Hocko
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