Re: page fault scalability patch V11 [0/7]: overview

From: Nick Piggin <nickpiggin_at_yahoo.com.au>
Date: 2004-11-20 15:03:17
William Lee Irwin III wrote:
> William Lee Irwin III wrote:
> 
>>>Unprivileged triggers for full-tasklist scans are NMI oops material.
> 
> 
> On Sat, Nov 20, 2004 at 02:37:04PM +1100, Nick Piggin wrote:
> 
>>Hang on, let's come back to this...
>>We already have unprivileged do-for-each-thread triggers in the proc
>>code. It's in do_task_stat, even. Rss reporting would basically just
>>involve one extra addition within that loop.
>>So... hmm, I can't see a problem with it.
> 
> 
> /proc/ triggering NMI oopses was a persistent problem even before that
> code was merged. I've not bothered testing it as it at best aggravates it.
> 

It isn't a problem. If it ever became a problem then we can just
touch the nmi oopser in the loop.

> And thread groups can share mm's. do_for_each_thread() won't suffice.
> 

I think it will be just fine.
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Received on Fri Nov 19 23:07:48 2004

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