linux-kernel - Re: [RFC][PATCH] putback_lru_page()/unevictable page handling rework v3

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Message-Id: <20080624121923.daac91cf.akpm@linux-foundation.org>
Date:	Tue, 24 Jun 2008 12:19:23 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, riel@...hat.com
Subject: Re: [RFC][PATCH] putback_lru_page()/unevictable page handling
 rework v3

On Tue, 24 Jun 2008 15:11:29 -0400
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> On Tue, 2008-06-24 at 10:55 -0700, Andrew Morton wrote:
> > On Tue, 24 Jun 2008 13:10:53 -0400 Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> > 
> > > On Tue, 2008-06-24 at 11:43 +0900, KOSAKI Motohiro wrote:
> > > > Hi
> > > > 
> > > > > I merged kamezawa-san's SHMEM related fix.
> > > > > this patch works well >2H.
> > > > > and, I am going to test on stress workload during this week end.
> > > > > 
> > > > > but I hope recieve review at first.
> > > > > thus I post it now.
> > > > 
> > > > Unfortunately, my machine crashed last night ;-)
> > > > I'll dig it.
> > > 
> > > 
> > > I ran 26-rc5-mm3 with 5 split/unevictable lru patches that you posted on
> > > 19june.  I replaced patch 5 of that series with the subject patch
> > > [rework v3, merged SHMEM fix].  This kernel ran my 'usex' stress load
> > > overnight for 23+ hours on both ia64 and x86_64 platforms with no
> > > problems.  I evidently did not hit the problem you did.
> > > 
> > > I'm rebuilding with a patch to a small problem that I discovered along
> > > with your recent patch to "prevent incorrect oom...".  I'll let you know
> > > how that goes as well.
> > > 
> > > I'll send along two additional patches shortly.
> > > 
> > 
> > My chances of working out which patches I need to apply to -mm are
> > near-zero.  I'm working through my vacation backlog in reverse order
> > and haven't got up to this topic yet.
> > 
> > As you've been paying attention it would be appreciated if you could
> > send me some stuff, please.
> 
> I saw your prior mail to Rik about this, but seem to have deleted it :(.
> 
> The stack that I'm currently running atop 26-rc5-mm3 contains the
> following:
> 
> >From Kosaki Motohiro ~19jun:
> [-mm][PATCH 1/5]  fix munlock page table walk
> [-mm][PATCH 2/5] migration_entry_wait fix.
> [-mm][PATCH 3/5] collect lru meminfo statistics from correct offset
> [-mm][PATCH 4/5]  fix incorrect Mlocked field of /proc/meminfo.
> The following patch replaces 5/5:
> [RFC][PATCH] putback_lru_page()/unevictable page handling rework v3
> The following "rfc" was acked by Rik:
> [RFC][PATCH] prevent incorrect oom under split_lru
> 
> Two that I posted today [24Jun]--fixes to the "rework v3" patch:
> [PATCH] fix to putback_lru_page()/unevictable page handling rework
> [PATCH] fix2 to putback_lru_page()/unevictable page handling
> ___
> The resulting kernel has been running well on my largish ia64 and x86_64
> platforms under a work load that I use to stress reclaim, swapping,
> mlocking, ...  However, Kosaki-san is apparently still experiencing
> panics with a cpuset migration scenario discovered by ___Daisuke
> Nishimura.  We're still investigating the crash, but the patches listed
> above, despite the "rfc" on a couple of them, are an improvement over
> 26-rc5-mm3.
> 
> I believe that Rik has at least one other fix related to "loopback over
> tmpfs" or such.
> 
> Is the list above sufficient to extract the patches from your mail
> backlog, or would you prefer that we resend them?

Please spoon-feed me ;) I can apply them and then I can pick through
the backlog for stuff which might have been missed.

> I'll also send along a patch to update the document to match the
> reworked lru handling methodology that Kamezawa Hiroyuki did.
> 
> Lee
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