linux-kernel - Re: [Experimental][PATCH] putback_lru

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Message-Id: <1213994489.6474.127.camel@lts-notebook>
Date:	Fri, 20 Jun 2008 16:41:29 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Kosaki Motohiro <kosaki.motohiro@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org
Subject: Re: [Experimental][PATCH] putback_lru_page rework

On Fri, 2008-06-20 at 13:10 -0400, Lee Schermerhorn wrote:
> On Fri, 2008-06-20 at 10:13 +0900, KAMEZAWA Hiroyuki wrote:
> > Lee-san, this is an additonal one..
> > Not-tested-yet, just by review.
> 
> OK, I'll test this on my x86_64 platform, which doesn't seem to hit the
> soft lockups.
> 

Quick update:  

With this patch applied, at ~ 1.5 hours into the test, my system panic'd
[panic_on_oops set] with a BUG in __find_get_block() -- looks like the
BUG_ON() in check_irqs_on() called from bh_lru_install() inlined by
__find_get_block().  Before the panic occurred, I saw warnings from
native_smp_call_function_mask() [arch/x86/kernel/smp.c]--also because
irqs_disabled().

I'll back out the changes [spin_[un]lock() => spin_[un]lock_irq()] to
shrink_inactive_list() and try again.  Just a hunch.

Lee

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