On Sun, 3 Feb 2008, Andrea Arcangeli wrote:
> On Thu, Jan 31, 2008 at 07:58:40PM -0800, Christoph Lameter wrote:
> > Ok. Andrea wanted the same because then he can void the begin callouts.
>
> Exactly. I hope the page-pin will avoid me having to serialize the KVM
> page fault against the start/en
On Thu, Jan 31, 2008 at 07:58:40PM -0800, Christoph Lameter wrote:
> Ok. Andrea wanted the same because then he can void the begin callouts.
Exactly. I hope the page-pin will avoid me having to serialize the KVM
page fault against the start/end critical section.
BTW, I wonder if the start/end cri
On Thu, Jan 31, 2008 at 07:58:40PM -0800, Christoph Lameter wrote:
> On Thu, 31 Jan 2008, Robin Holt wrote:
>
> > > + void (*invalidate_range_end)(struct mmu_notifier *mn,
> > > + struct mm_struct *mm, int atomic);
> >
> > I think we need to pass in the same start-end her
On Thu, 31 Jan 2008, Robin Holt wrote:
> > + void (*invalidate_range_end)(struct mmu_notifier *mn,
> > +struct mm_struct *mm, int atomic);
>
> I think we need to pass in the same start-end here as well. Without it,
> the first invalidate_range would have to block fa
> Index: linux-2.6/include/linux/mmu_notifier.h
...
> +struct mmu_notifier_ops {
...
> + /*
> + * invalidate_range_begin() and invalidate_range_end() must paired.
> + * Multiple invalidate_range_begin/ends may be nested or called
> + * concurrently. That is legit. However, no new
On Thu, 31 Jan 2008, Jack Steiner wrote:
> I currently unlink the mmu_notifier when the last GRU mapping is closed. For
> example, if a user does a:
>
> gru_create_context();
> ...
> gru_destroy_context();
>
> the mmu_notifier is unlinked and all task tables allocated
> b
On Thu, 31 Jan 2008, Robin Holt wrote:
> Both xpmem and GRU have means of removing their context seperate from
> process termination. XPMEMs is by closing the fd, I believe GRU is
> the same. In the case of XPMEM, we are able to acquire the mmap_sem.
> For GRU, I don't think it is possible, but
On Thu, Jan 31, 2008 at 06:39:19PM -0800, Christoph Lameter wrote:
> On Thu, 31 Jan 2008, Robin Holt wrote:
>
> > Jack has repeatedly pointed out needing an unregister outside the
> > mmap_sem. I still don't see the benefit to not having the lock in the mm.
>
> I never understood why this would
On Thu, Jan 31, 2008 at 06:39:19PM -0800, Christoph Lameter wrote:
> On Thu, 31 Jan 2008, Robin Holt wrote:
>
> > Jack has repeatedly pointed out needing an unregister outside the
> > mmap_sem. I still don't see the benefit to not having the lock in the mm.
>
> I never understood why this would
On Thu, 31 Jan 2008, Robin Holt wrote:
> Jack has repeatedly pointed out needing an unregister outside the
> mmap_sem. I still don't see the benefit to not having the lock in the mm.
I never understood why this would be needed. ->release removes the
mmu_notifier right now.
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On Thu, 31 Jan 2008, Jack Steiner wrote:
> Christoph, is it time to post a new series of patches? I've got
> as many fixup patches as I have patches in the original posting.
Maybe wait another day? This is getting a bit too frequent and so far we
have only minor changes.
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On Thu, Jan 31, 2008 at 08:24:44PM -0600, Robin Holt wrote:
> On Thu, Jan 31, 2008 at 07:56:12PM -0600, Jack Steiner wrote:
> > > @@ -2033,6 +2034,7 @@ void exit_mmap(struct mm_struct *mm)
> > > unsigned long end;
> > >
> > > /* mm's last user has gone, and its about to be pulled down */
> >
Christoph,
Jack has repeatedly pointed out needing an unregister outside the
mmap_sem. I still don't see the benefit to not having the lock in the mm.
Thanks,
Robin
Index: mmu_notifiers-cl-v4/include/linux/mm_types.h
===
--- mmu_no
On Thu, Jan 31, 2008 at 07:56:12PM -0600, Jack Steiner wrote:
> > @@ -2033,6 +2034,7 @@ void exit_mmap(struct mm_struct *mm)
> > unsigned long end;
> >
> > /* mm's last user has gone, and its about to be pulled down */
> > + mmu_notifier(invalidate_all, mm, 0);
> > arch_exit_mmap(mm
> @@ -2033,6 +2034,7 @@ void exit_mmap(struct mm_struct *mm)
> unsigned long end;
>
> /* mm's last user has gone, and its about to be pulled down */
> + mmu_notifier(invalidate_all, mm, 0);
> arch_exit_mmap(mm);
>
The name of the "invalidate_all" callout is not very descr
Notifier functions for hardware and software that establishes external
references to pages of a Linux system. The notifier calls ensure that
external mappings are removed when the Linux VM removes memory ranges
or individual pages from a process.
These fall into two classes:
1. mmu_notifier
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