linux-kernel - Re: [PATCH 2/4] perf,hw_breakpoint: add lockless reservation forhw

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Message-ID: <4B60BE31.5030707@windriver.com>
Date:	Wed, 27 Jan 2010 16:29:05 -0600
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	mingo@...e.hu, "K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 2/4] perf,hw_breakpoint: add lockless reservation forhw_breaks

Frederic Weisbecker wrote:
> On Tue, Jan 26, 2010 at 01:25:19PM -0600, Jason Wessel wrote:
>   
>> @@ -250,11 +326,16 @@ int reserve_bp_slot(struct perf_event *b
>>  
>>  	mutex_lock(&nr_bp_mutex);
>>  
>> +	ret = dbg_hw_breakpoint_alloc(bp->cpu);
>> +	if (ret)
>> +		goto end;
>> +
>>     
>
>
>
> This is totally breaking all the constraints that try to
> make the reservation cpu-wide/task-wide aware.
>   

Agreed.  I was unaware of all the various pieces that the toggle_bp
handled.

A revised series is on the way based on the off-list discussion.

Thanks,
Jason.

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