linux-kernel - Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

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Message-ID: <4B532508.4000806@redhat.com>
Date:	Sun, 17 Jan 2010 16:56:08 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	ananth@...ibm.com, Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	utrace-devel <utrace-devel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

On 01/17/2010 04:52 PM, Peter Zijlstra wrote:
> On Sun, 2010-01-17 at 16:39 +0200, Avi Kivity wrote:
>    
>> On 01/15/2010 11:50 AM, Peter Zijlstra wrote:
>>      
>>> As previously stated, I think poking at a process's address space is an
>>> utter no-go.
>>>
>>>        
>> Why not reserve an address space range for this, somewhere near the top
>> of memory?  It doesn't have to be populated if it isn't used.
>>      
> Because I think poking at a process's address space like that is gross.
>    

If it's reserved, it's no longer the process' address space.

> Also, if its fixed size you're imposing artificial limits on the number
> of possible probes.
>    

Obviously we'll need a limit, a uprobe will also take kernel memory, we 
can't allow people to exhaust it.

-- 
error compiling committee.c: too many arguments to function

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