* question about pt locking
@ 2009-03-20 8:16 Shentino
2009-03-20 8:52 ` Peter Zijlstra
0 siblings, 1 reply; 3+ messages in thread
From: Shentino @ 2009-03-20 8:16 UTC (permalink / raw)
To: linux-kernel
Just curious, but does a process effectively have a read-lock on its
page tables when it's in userland?
-- a curious newbie
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: question about pt locking
2009-03-20 8:16 question about pt locking Shentino
@ 2009-03-20 8:52 ` Peter Zijlstra
2009-03-20 9:24 ` Shentino
0 siblings, 1 reply; 3+ messages in thread
From: Peter Zijlstra @ 2009-03-20 8:52 UTC (permalink / raw)
To: Shentino; +Cc: linux-kernel
On Fri, 2009-03-20 at 01:16 -0700, Shentino wrote:
> Just curious, but does a process effectively have a read-lock on its
> page tables when it's in userland?
No, page reclaim can fiddle with a running process' page tables
concurrently.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: question about pt locking
2009-03-20 8:52 ` Peter Zijlstra
@ 2009-03-20 9:24 ` Shentino
0 siblings, 0 replies; 3+ messages in thread
From: Shentino @ 2009-03-20 9:24 UTC (permalink / raw)
To: Peter Zijlstra; +Cc: Shentino, linux-kernel
On Fri, Mar 20, 2009 at 09:52:10AM +0100, Peter Zijlstra wrote:
> On Fri, 2009-03-20 at 01:16 -0700, Shentino wrote:
> > Just curious, but does a process effectively have a read-lock on its
> > page tables when it's in userland?
>
> No, page reclaim can fiddle with a running process' page tables
> concurrently.
Yeah just now remembered why the kernel has tlb inval/flush routines
...duh...
Thanks for the answers though, I learned something today.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-03-20 8:16 question about pt locking Shentino
2009-03-20 8:52 ` Peter Zijlstra
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