linux-kernel - Re: [RFC][RT][PATCH] mm: Do not use stop_machine() for __zone_pcp_udpate() for CONFIG_PREEMPT_RT

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Date:	Tue, 19 Jun 2012 14:52:51 -0700
From:	Frank Rowand <frank.rowand@...sony.com>
To:	"Rowand, Frank" <Frank_Rowand@...yusa.com>
CC:	Aaditya Kumar <aaditya.kumar.30@...il.com>,
	"shaohua.li@...el.com" <shaohua.li@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"C.Emde@...dl.org" <C.Emde@...dl.org>,
	"jkacur@...hat.com" <jkacur@...hat.com>,
	"Bird, Tim" <Tim.Bird@...sony.com>,
	"Ohara, Takuzo" <Takuzo.Ohara@...sony.com>,
	"Iibuchi, Kan (TDG)" <Kan.Iibuchi@...sony.com>
Subject: Re: [RFC][RT][PATCH] mm: Do not use stop_machine() for __zone_pcp_udpate()
 for CONFIG_PREEMPT_RT_FULL

On 06/19/12 12:46, Frank Rowand wrote:
> Adding to the distribution list: the author of the patch that included
> the call to stop_machine() (commit 112067f0905b2de862c607ee62411cf47d2fe5c4).
> 
> On 06/19/12 11:32, Aaditya Kumar wrote:
>> The code path of __zone_pcp_update() has following locks, which in
>> CONFIG_PREEMPT_RT_FULL=y are rt-mutex.
>>   - pa_lock locked by cpu_lock_irqsave()
>>   - zone->lock locked by free_pcppages_bulk()
>>
>> Since __zone_pcp_update() is called from stop_machine(), so with

< snip >

... and just for the record, adding the author (Shaohua Li) did not
work, I got an email reject from Intel.

-Frank

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