linux-kernel - Re: HW breakpoints perf

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Message-ID: <bc915a051001141003s766689beue73800a1308d957e@mail.gmail.com>
Date:	Thu, 14 Jan 2010 10:03:27 -0800
From:	Joshua Pincus <joshua.pincus@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>, peterz@...radead.org,
	paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: HW breakpoints perf_events request

Hi,

On Thu, Jan 14, 2010 at 1:23 AM, Andi Kleen <andi@...stfloor.org> wrote:
>> We would like to avoid using ptrace at all costs.
>> It requires us to have a parent thread running
>> which monitors all the others.  It's not clear that
>> the wait() call by the parent doesn't mask a barrage
>> of signals from various threads and the performance
>
> mask? It'll report them. You expect to have so
> many signals that this would be a problem?

Yes.  We expect to see a zillion of them.

> -Andi
>

Thanks,
JP
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