linux-kernel - Re: [PATCH v4 3.0-rc2-tip 0/22] 0: Uprobes patchset with perf probe support

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Message-ID: <20110613092339.GF27130@linux.vnet.ibm.com>
Date:	Mon, 13 Jun 2011 14:53:39 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 0/22]  0: Uprobes patchset with perf
 probe support

* Peter Zijlstra <peterz@...radead.org> [2011-06-09 20:42:24]:

> On Tue, 2011-06-07 at 18:28 +0530, Srikar Dronamraju wrote:
> > - Breakpoint handling should co-exist with singlestep/blockstep from
> >   another tracer/debugger.

We can remove this now.
Previous to this patchset the post notifier would run in interrupt
context hence we couldnt call user_disable_single_step

However from this patchset, (due to changes to do away with per task
slot), we run the post notifier in task context. Hence we can now call
user_enable_single_step/user_disable_single_step which does the right
thing. 

Please correct me if I am missing.

> > - Queue and dequeue signals delivered from the singlestep till
> >   completion of postprocessing. 
> 

I am working towards this.  
> These two are important to sort before we can think of merging this
> right?
> 

-- 
Thanks and Regards
Srikar

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