linux-kernel - Re: [RFC Patch 4/5] PERF-HW_HBKPT: Enable perf-events to use hw-breakpoints

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Date:	Sun, 22 Nov 2009 03:52:00 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [RFC Patch 4/5] PERF-HW_HBKPT: Enable perf-events to use
	hw-breakpoints

On Fri, Oct 30, 2009 at 03:52:23AM +0530, K.Prasad wrote:
> Enable perf-events to collect memory access statistics on kernel-space
> data in the context of a running process.
> 
> Signed-off-by: K.Prasad <prasad@...ux.vnet.ibm.com>

I'm going to take the userspace part of this patch to integrate breakpoints
in perf tools.

But I'm not sure passing the name of the symbol to the kernel and store
it in the perf attr is a good idea.
We should probably resolve the name from userspace and pass the address
to the kernel. Mostly because if we want to support breakpoints in
userspace apps, we don't want conflicts between kernel and userspace
symbols.

Thanks.

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