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Subject: Re: [PATCH] powerpc: Fix bug where perf_counters breaks oprofile
From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
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Date: Tue, 15 Sep 2009 10:56:47 +1000
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Cc: Paul Mackerras <paulus@samba.org>, Maynard Johnson <mpjohn@us.ibm.com>,
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On Mon, 2009-09-14 at 16:43 -0400, Josh Boyer wrote:
> On Mon, Sep 14, 2009 at 03:14:02PM -0500, Maynard Johnson wrote:
> >Maynard Johnson wrote:
> >> Paul Mackerras wrote:
> >>> Currently there is a bug where if you use oprofile on a pSeries
> >>> machine, then use perf_counters, then use oprofile again, oprofile
> >>> will not work correctly; it will lose the PMU configuration the next
> >>> time the hypervisor does a partition context switch, and thereafter
> >>> won't count anything.
> >Ben,
> >Is there any way to get this bug fix into 2.6.31 or is the window closed?  Once the problem occurs, you can't get oprofile to work again without a reboot.  Really would be nice (for many reasons) to get this fixed in .31.
> 
> .31 is already released.  Could probably get it into a -stable .31 kernel
> though.

The fix is already upstream as well no ?

Ben.

> josh