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

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Message-Id: <20080621175458.E82A.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Sat, 21 Jun 2008 17:56:17 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.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

> 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.

Yup.
Kamezawa-san's patch remove local_irq_enable(), but don't remove
local_irq_disable().
thus, irq is never enabled.

> -	spin_unlock(&zone->lru_lock);
> +	spin_unlock_irq(&zone->lru_lock);
>  done:
> -	local_irq_enable();



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