linux-kernel - RE: [RFC] mm: remove swapcache page early

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Message-ID: <125abdf8-0af9-447b-8782-68acf1c9c229@default>
Date:	Thu, 28 Mar 2013 10:35:52 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Shaohua Li <shli@...nel.org>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <bob.liu@...cle.com>
Subject: RE: [RFC] mm: remove swapcache page early

> From: Hugh Dickins [mailto:hughd@...gle.com]
> Subject: RE: [RFC] mm: remove swapcache page early
> 
> On Wed, 27 Mar 2013, Dan Magenheimer wrote:
> > > From: Hugh Dickins [mailto:hughd@...gle.com]
> > > Subject: Re: [RFC] mm: remove swapcache page early
> > >
> > The issue you are raising
> > here is (2).  You may not know that (2) has recently been solved
> > in frontswap, at least for zcache.  See frontswap_exclusive_gets_enabled.
> > If this is enabled (and it is for zcache but not yet for zswap),
> > what you suggest (SetPageDirty) is what happens.
> 
> Ah, and I have a dim, perhaps mistaken, memory that I gave you
> input on that before, suggesting the SetPageDirty.  Good, sounds
> like the solution is already in place, if not actually activated.
> 
> Thanks, must dash,
> Hugh

Hi Hugh --

Credit where it is due...  Yes, I do recall now that the idea
was originally yours.  It went on a to-do list where I eventually
tried it and it worked... I'm sorry I had forgotten and neglected
to give you credit!

(BTW, it is activated for zcache in 3.9.)

Thanks,
Dan
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