Hi,
On Sun, Mar 18, 2001 at 10:34:38AM +0100, Manfred Spraul wrote:
> > The problem is that mmap_sem seems to be protecting the list
> > of VMAs, so taking _only_ the page_table_lock could let a VMA
> > change under us while a page fault is underway ...
>
> No, that can't happen.
It can.
Hi,
On Sun, Mar 18, 2001 at 10:34:38AM +0100, Manfred Spraul wrote:
The problem is that mmap_sem seems to be protecting the list
of VMAs, so taking _only_ the page_table_lock could let a VMA
change under us while a page fault is underway ...
No, that can't happen.
It can. Page faults
>
> The problem is that mmap_sem seems to be protecting the list
> of VMAs, so taking _only_ the page_table_lock could let a VMA
> change under us while a page fault is underway ...
No, that can't happen.
VMA changes only happen if both the mmap_sem and the page table lock is
acquired. (check
The problem is that mmap_sem seems to be protecting the list
of VMAs, so taking _only_ the page_table_lock could let a VMA
change under us while a page fault is underway ...
No, that can't happen.
VMA changes only happen if both the mmap_sem and the page table lock is
acquired. (check
Hi,
On Fri, Mar 16, 2001 at 08:50:25AM -0300, Rik van Riel wrote:
> On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
>
> > > Write locks would be used in the code where we actually want
> > > to change the VMA list and page faults would use an extra lock
> > > to protect against each other
Hi,
On Thu, Mar 15, 2001 at 09:24:59AM -0300, Rik van Riel wrote:
> On Wed, 14 Mar 2001, Rik van Riel wrote:
> The mmap_sem is used in procfs to prevent the list of VMAs
> from changing. In the page fault code it seems to be used
> to prevent other page faults to happen at the same time with
>
Hi,
On Thu, Mar 15, 2001 at 09:24:59AM -0300, Rik van Riel wrote:
On Wed, 14 Mar 2001, Rik van Riel wrote:
The mmap_sem is used in procfs to prevent the list of VMAs
from changing. In the page fault code it seems to be used
to prevent other page faults to happen at the same time with
the
Hi,
On Fri, Mar 16, 2001 at 08:50:25AM -0300, Rik van Riel wrote:
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
Write locks would be used in the code where we actually want
to change the VMA list and page faults would use an extra lock
to protect against each other (possibly a
On Wed, 14 Mar 2001, Rik van Riel wrote:
> On Wed, 14 Mar 2001, george anzinger wrote:
>
> > Is it REALLY necessary to prevent them from seeing an
> > inconsistent state? Seems to me that in the total picture (i.e.
> > system wide) they will never see a consistent state, so why be
> > concerned
On Wed, 14 Mar 2001, Rik van Riel wrote:
On Wed, 14 Mar 2001, george anzinger wrote:
Is it REALLY necessary to prevent them from seeing an
inconsistent state? Seems to me that in the total picture (i.e.
system wide) they will never see a consistent state, so why be
concerned with a
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