linux-ext4 - Re: mount options lazytime

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Message-ID: <8737lmzq2m.fsf@openvz.org>
Date:   Tue, 30 Aug 2016 10:14:09 +0300
From:   Dmitry Monakhov <dmonlist@...il.com>
To:     Владимир Тимофиев 
        <elimelech007@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: mount options lazytime

Владимир Тимофиев <elimelech007@...il.com> writes:

> Good afternoon!
> Please tell me these mount options to register properly:
>
> # / was on /dev/sda6 during installation
> UUID=d655749d-9d0b-48b9-a255-92efd6a36997 /               ext4
> errors=remount-ro,relatime,lazytime 0       1
>
> lazytime or relatime,lazytime  or you can just leave lazytime ?
relatime is an option which delay atime update.
lazytime is an option which delay atime and mtime update.
See https://lwn.net/Articles/621046/

You should enable lazytime if you care about latency on write path.
For example io_submit() may block on synchronous mtime update.
> Thanks for the answer!
>
> -- 
> Желаю вам поддержки Свыше и успеха!
>
> С уважением,
> Ваш  Владимир Тимофиев <http://copi.ru/94717/>
> NrybXǧv^)޺{.n+{{x{ayʇڙ,j.fhzw.j:+vwjm.zZ+ݢj"!

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