linux-kernel - Re: Zram writeback feature unstable with heavy swap utilization

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Message-ID: <20180727225850.GC229060@rodete-desktop-imager.corp.google.com>
Date:   Sat, 28 Jul 2018 07:58:50 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Tino Lehnig <tino.lehnig@...tabo.de>
Cc:     ngupta@...are.org, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Zram writeback feature unstable with heavy swap utilization -
 BUG: Bad page state in process...

On Fri, Jul 27, 2018 at 02:13:57PM +0200, Tino Lehnig wrote:
> On 07/27/2018 02:05 PM, Minchan Kim wrote:
> > And bad page is always with writeback enable?
> > 
> > writeback enable means "echo "some dev" > /sys/block/zram0/backing_dev,
> > not just enable CONFIG_ZRAM_WRITEBACK.
> 
> Yes, the bug only appears when backing_dev is set.

Thanks for the clarifiation.

I made a mistake on previous patch.
Could you test this patches?

> 
> -- 
> Kind regards,
> 
> Tino Lehnig

View attachment "0001-zram-remove-BD_CAP_SYNCHRONOUS_IO-with-writeback-fea.patch" of type "text/x-diff" (1707 bytes)

View attachment "0002-swap-free-allocated-page-if-swap_read-fails.patch" of type "text/x-diff" (951 bytes)