linux-kernel - Re: HW breakpoints perf

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Message-ID: <20100114092350.GF12241@basil.fritz.box>
Date:	Thu, 14 Jan 2010 10:23:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Joshua Pincus <joshua.pincus@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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

> 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?

-Andi
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