linux-kernel - Re: [RFC Patch 6/9] Use virtual debug registers in process/thread handling code

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Date:	Thu, 4 Dec 2008 17:53:49 +0530
From:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, mingo@...e.hu,
	jason.wessel@...driver.com, avi@...ranet.com,
	richardj_moore@...ibm.com
Subject: Re: [RFC Patch 6/9] Use virtual debug registers in process/thread
	handling code

On Wed, Dec 03, 2008 at 05:05:59PM -0800, Roland McGrath wrote:
> > > Hmm.  The 64-bit version of __switch_to does the current change much
> > > earlier, before __switch_to_xtra and math_state_restore.  I wonder if the
> > > 32-bit version could change to match.  I can't see what in __switch_to_xtra
> > > would care either way, though I may be overlooking something.  Ingo?
> > 
> > Would it be better to move __switch_to_xtra down below the change to 
> > current, rather than moving the change to current up above 
> > __switch_to_xtra?
> 
> I can't see that anything else in __switch_to_xtra cares either way.
> 
> 
> Thanks,
> Roland
>

That the grouse against the placement of
switch_to_thread_hw_breakpoint() is about additional code in the
hot-path, can we deal with this separately through a different patch?

I now have the patchset which provides only data breakpoint facility on
x86 (and x86_64) and has addressed your comments, ported against
2.6.28-rc7 which will be sent shortly. I'm thinking if the suggested
changes to the context-switching code can be handled later.

Thanks,
K.Prasad

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