linux-kernel - Re: 2.6.26-rc5-mm2 (swap

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Message-ID: <20080613180348.55d3fb67@bree.surriel.com>
Date:	Fri, 13 Jun 2008 18:03:48 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: 2.6.26-rc5-mm2 (swap_state.c:77)

On Fri, 13 Jun 2008 22:15:01 +0100 (BST)
Hugh Dickins <hugh@...itas.com> wrote:

> > I guess we'll need per-mapping flags to help determine where
> > a page goes at add_to_page_cache_lru() time.
> 
> The better way would be to add a backing_dev_info flag.  (At one
> point I had been going to criticize your per-mapping AS_UNEVICTABLE,
> to say that one should be a backing_dev_info flag; but no, you're
> right, you've the SHM_LOCK case where it has to be per-mapping.)

Good point.  I'll take a look at that.
 
> > > Am I right to think that the memcontrol stuff is now all broken,
> > > because memcontrol.c hasn't yet been converted to the more LRUs?
> > > Certainly I'm now hanging when trying to run in a restricted memcg.
> > 
> > I believe memcontrol has been converted.  Of course, maybe
> > they changed some stuff under me that I didn't notice :(
> 
> Ah, yes, there are NR_LRU_LISTS arrays in there now, so it has
> the appearance of having been converted.  Fine, then it's worth
> my looking into why it isn't actually working as intended.

I believe that Lee and Kosaki-san have tested this code,
so the breakage could be pretty new.

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