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References: <20211130201652.2218636d@mail.inbox.lv> <2dc51fc8-f14e-17ed-a8c6-0ec70423bf54@valdikss.org.ru>
In-Reply-To: <2dc51fc8-f14e-17ed-a8c6-0ec70423bf54@valdikss.org.ru>
From:   Barry Song <21cnbao@gmail.com>
Date:   Mon, 13 Dec 2021 21:38:45 +1300
Message-ID: <CAGsJ_4zMoV6UJGC_X-VRM7p8w68a0Q8sLVfS3sRFxuQUtHoASw@mail.gmail.com>
Subject: Re: [PATCH] mm/vmscan: add sysctl knobs for protecting the working set
To:     ValdikSS <iam@valdikss.org.ru>
Cc:     Alexey Avramov <hakavlad@inbox.lv>, Linux-MM <linux-mm@kvack.org>,
        Linux Doc Mailing List <linux-doc@vger.kernel.org>,
        linux-fsdevel@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Andrew Morton <akpm@linux-foundation.org>, mcgrof@kernel.org,
        Kees Cook <keescook@chromium.org>, yzaikin@google.com,
        oleksandr@natalenko.name, kernel@xanmod.org, aros@gmx.com,
        hakavlad@gmail.com, Yu Zhao <yuzhao@google.com>
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On Tue, Dec 7, 2021 at 5:47 AM ValdikSS <iam@valdikss.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