linux-kernel - Re: swap on eMMC and other flash

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Message-ID: <alpine.LSU.2.00.1204020734560.1847@eggly.anvils>
Date:	Mon, 2 Apr 2012 07:41:56 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linaro-kernel@...ts.linaro.org, Rik van Riel <riel@...hat.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Alex Lemberg <alex.lemberg@...disk.com>,
	linux-kernel@...r.kernel.org,
	"Luca Porzio (lporzio)" <lporzio@...ron.com>, linux-mm@...ck.org,
	Hyojin Jeong <syr.jeong@...sung.com>, kernel-team@...roid.com,
	Yejin Moon <yejin.moon@...sung.com>
Subject: Re: swap on eMMC and other flash

On Mon, 2 Apr 2012, Arnd Bergmann wrote:
> 
> Another option would be batched discard as we do it for file systems:
> occasionally stop writing to swap space and scanning for areas that
> have become available since the last discard, then send discard
> commands for those.

I'm not sure whether you've missed "swapon --discard", which switches
on discard_swap_cluster() just before we allocate from a new cluster;
or whether you're musing that it's no use to you because you want to
repurpose the swap cluster to match erase block: I'm mentioning it in
case you missed that it's already there (but few use it, since even
done at that scale it's often more trouble than it's worth).

Hugh
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