linux-kernel - Re: [PATCH] squashfs: Migrate from ll_rw

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Date:   Fri, 25 Oct 2019 10:53:35 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Philippe Liard <pliard@...gle.com>
CC:     <phillip@...ashfs.org.uk>, <linux-kernel@...r.kernel.org>,
        <groeck@...omium.org>, <linux-erofs@...ts.ozlabs.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: Re: [PATCH] squashfs: Migrate from ll_rw_block usage to BIO

On Fri, Oct 25, 2019 at 09:45:31AM +0900, Philippe Liard wrote:
> > Personally speaking, just for Android related use cases, I'd suggest
> > latest EROFS if you care more about system overall performance more
> > than compression ratio, even https://lkml.org/lkml/2017/9/22/814 is
> > applied (you can do benchmark), we did much efforts 3 years ago.
> >
> > And that is not only performance but noticable memory overhead (a lot
> > of extra memory allocations) and heavy page cache thrashing in low
> > memory scenarios (it's very common [1].)
> 
> Thanks for the suggestion. EROFS is on our radar and we will
> (re)consider it once it goes out of staging. But we will most likely
> stay on squashfs until this happens.

EROFS is already out of staging in mainline right now,
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/erofs/

If you agree on that, I'd suggest you try it right now
since it's widely (200+ million devices on the market)
deployed for our Android smartphones and fully open source
and open community. I think this is not a regrettable
attempt and we can response any question.

https://lore.kernel.org/r/20191024033259.GA2513@hsiangkao-HP-ZHAN-66-Pro-G1

In my personal opinion, just for Android use cases,
I think it is worth taking some time.

Thanks,
Gao Xiang