linux-kernel - RE: [patch 4/14] x86, ds: wait before freeing the DS configuration

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E9266B6D8@irsmsx504.ger.corp.intel.com>
Date:	Fri, 27 Mar 2009 15:39:31 +0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"eranian@...glemail.com" <eranian@...glemail.com>,
	"Villacis, Juan" <juan.villacis@...el.com>,
	"ak@...ux.jf.intel.com" <ak@...ux.jf.intel.com>
Subject: RE: [patch 4/14] x86, ds: wait before freeing the DS configuration

>-----Original Message-----
>From: Oleg Nesterov [mailto:oleg@...hat.com]
>Sent: Friday, March 27, 2009 3:36 PM
>To: Metzger, Markus T
>Cc: linux-kernel@...r.kernel.org; mingo@...e.hu; tglx@...utronix.de; hpa@...or.com;
>markus.t.metzger@...il.com; roland@...hat.com; eranian@...glemail.com; Villacis, Juan;
>ak@...ux.jf.intel.com
>Subject: Re: [patch 4/14] x86, ds: wait before freeing the DS configuration
>
>On 03/27, Markus Metzger wrote:
>>
>> --- git-tip.orig/arch/x86/kernel/ds.c	2009-03-27 07:59:23.000000000 +0100
>> +++ git-tip/arch/x86/kernel/ds.c	2009-03-27 08:00:41.000000000 +0100
>> @@ -783,6 +783,14 @@ void ds_release_bts(struct bts_tracer *t
>>
>>  	ds_suspend_bts(tracer);
>>
>> +	/*
>> +	 * We must wait for the suspend to take effect before we may
>> +	 * free the tracer and the ds configuration.
>> +	 */
>> +	if (tracer->ds.context->task &&
>> +	    (tracer->ds.context->task != current))
>> +		wait_task_inactive(tracer->ds.context->task, 0);
>> +
>
>Since you didn't replay yet, I will just repeat my question ;)

I replied in http://lkml.org/lkml/2009/3/27/220.

regards,
markus.

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