linux-kernel - Re: how to check how much data left to sync to disk at umount?

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Message-ID: <CAAJw_ZvJEx00psiGOk1_2WtUVGgztiap-p0uqYK4vu8Qz2O46w@mail.gmail.com>
Date:	Fri, 18 Sep 2015 19:36:06 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: how to check how much data left to sync to disk at umount?

On Thu, Sep 17, 2015 at 9:50 AM, Dave Chinner <david@...morbit.com> wrote:
> On Mon, Sep 07, 2015 at 01:29:33PM +0800, Jeff Chua wrote:
>> When umount a slow device such as an SD card, the command will take a
>> while to run depending on how much data is left to write to the
>> device. Is there way to check how much data is remaining waiting to
>> write to the device?
>
> $ grep "Dirty\|Writeback" /proc/meminfo
>
> And infer from that.

It be a big challenge if the SD write is not the only disk activity!

Jeff
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