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[Xen-devel] Re: Question about x86/mm/gup.c's use of disabled interrupts

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: Shentino <shentino@xxxxxxxxx>
Subject: [Xen-devel] Re: Question about x86/mm/gup.c's use of disabled interrupts
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 18 Mar 2009 16:37:24 -0700
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Linux Memory Management List <linux-mm@xxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>
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Shentino wrote:
But, does a CPU running a task in userspace effectively have a read lock on the page tables?
No. A process has its own user pagetable which the kernel maintains on its behalf. The kernel will briefly take locks on it while doing modifications, mostly to deal with multithreaded usermode code running on multiple cpus. 

   J

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