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

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Message-Id: <20191025004531.89978-1-pliard@google.com>
Date:   Fri, 25 Oct 2019 09:45:31 +0900
From:   Philippe Liard <pliard@...gle.com>
To:     phillip@...ashfs.org.uk
Cc:     linux-kernel@...r.kernel.org, groeck@...omium.org,
        pliard@...gle.com
Subject: Re: [PATCH] squashfs: Migrate from ll_rw_block usage to BIO

> 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.