linux-kernel - Re: [PATCH] mm/vmscan: add sysctl knobs for protecting the working set

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Message-ID: <CAGsJ_4zMoV6UJGC_X-VRM7p8w68a0Q8sLVfS3sRFxuQUtHoASw@mail.gmail.com>
Date:   Mon, 13 Dec 2021 21:38:45 +1300
From:   Barry Song <21cnbao@...il.com>
To:     ValdikSS <iam@...dikss.org.ru>
Cc:     Alexey Avramov <hakavlad@...ox.lv>, Linux-MM <linux-mm@...ck.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>, mcgrof@...nel.org,
        Kees Cook <keescook@...omium.org>, yzaikin@...gle.com,
        oleksandr@...alenko.name, kernel@...mod.org, aros@....com,
        hakavlad@...il.com, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH] mm/vmscan: add sysctl knobs for protecting the working set

On Tue, Dec 7, 2021 at 5:47 AM ValdikSS <iam@...dikss.org.ru> wrote:
>
> This patchset is surprisingly effective and very useful for low-end PC
> with slow HDD, single-board ARM boards with slow storage, cheap Android
> smartphones with limited amount of memory. It almost completely prevents
> thrashing condition and aids in fast OOM killer invocation.
>

Can you please post your hardware information like what is the cpu, how much
memory you have and also post your sysctl knobs, like how do you set
vm.anon_min_kbytes,  vm.clean_low_kbytes and vm.clean_min_kbytes?

> The similar file-locking patch is used in ChromeOS for nearly 10 years
> but not on stock Linux or Android. It would be very beneficial for
> lower-performance Android phones, SBCs, old PCs and other devices.
>

Can you post the link of the similar file-locking patch?

> With this patch, combined with zram, I'm able to run the following
> software on an old office PC from 2007 with __only 2GB of RAM__
> simultaneously:
>
>   * Firefox with 37 active tabs (all data in RAM, no tab unloading)
>   * Discord
>   * Skype
>   * LibreOffice with the document opened
>   * Two PDF files (14 and 47 megabytes in size)
>
> And the PC doesn't crawl like a snail, even with 2+ GB in zram!
> Without the patch, this PC is barely usable.
> Please watch the video:
> https://notes.valdikss.org.ru/linux-for-old-pc-from-2007/en/
>

The video was captured before using this patch? what video says
"the result of the test computer after the configuration", what does
"the configuration" mean?

Thanks
Barry