Re: [patch] x86, bts: use atomic memory allocation

[Ingo Molnar]

* Metzger, Markus T <markus.t.metzger@xxxxxxxxx> wrote:

> >-----Original Message-----
> >From: Ingo Molnar [mailto:mingo@xxxxxxx]
> >Sent: Thursday, March 19, 2009 5:12 PM
> >To: Metzger, Markus T
> 
> 
> >> Ds_request_bts() needs to allocate memory. It uses GFP_KERNEL.
> >>
> >> Hw-branch-tracer calls ds_request_bts() within on_each_cpu().
> >>
> >> Use atomic memory allocation to allow it to be used in that context.
> >
> >the hw-branch-tracer still crashes during bootup. Have you tried the
> >config i sent to you, and have you tried to reproduce it? I've
> >attached another config that crashes.
> 
> The first config boots OK.

> The second config boots OK with the additional changes to keep the 
> GFP_KERNEL and move the ds_request_bts() calls out of the 
> on_each_cpu() in the hw-branch-tracer.
> 
> I don't know yet what exactly causes the crash and if there is a 
> simpler fix.

hm, this was an AMD box - so perhaps they dont have a compatible DS 
implementation?

	Ingo
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