Re: [RFC] [PATCH 00/19] Non disruptive application core dump infrastructureusing task_work_add()

[Suzuki K. Poulose]

On 10/04/2013 07:14 PM, Andi Kleen wrote:
> On Fri, Oct 04, 2013 at 04:00:12PM +0530, Janani Venkataraman wrote:
>> Hi all,
>>
>> The following series implements an infrastructure for capturing the core of an 
>> application without disrupting its process.
> 
> The problem is that gcore et.al. have to stop the process briefly
> to attach and then use the pid mmap ptrace interfaces, right?
> 
Correct.

> Couldn't they just use the new process_vm_readv() syscalls instead?
> AFAIK those do not require ptrace.
> 
We need the register set and hence would need a ptrace.

> Then this could be all done in user space.
> 
> Or are there some specific races with this approach?
> 
Cheers
Suzuki

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