linux-kernel - RE: [patch 01/18] x86, bts: fix race when bts tracer is removed

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E9271809B@irsmsx504.ger.corp.intel.com>
Date:	Fri, 3 Apr 2009 08:17:22 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"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>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"Villacis, Juan" <juan.villacis@...el.com>,
	"ak@...ux.jf.intel.com" <ak@...ux.jf.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [patch 01/18] x86, bts: fix race when bts tracer is removed

>-----Original Message-----
>From: Metzger, Markus T
>Sent: Friday, April 03, 2009 8:20 AM
>To: Ingo Molnar


>>Also, raw use of jiffies_64 is buggy and racy. Why does this use
>>jiffies to begin with - why not some finer grained time?
>
>What would be a good time to use?

I found cpu_clock() declared in sched.h, which is based on TSC and
seems to be used by the scheduler, as well.
Would this be a good time to use?

thanks,
markus.

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