On Sun, 18 Mar 2001, Linus Torvalds wrote:
> On Sun, 18 Mar 2001, Rik van Riel wrote:
> >
> > Indeed, having threaded apps do multiple page faults at the
> > same time is the main goal of this patch. However, I don't
> > see how it would be good for scalability to have multiple
> > threads fault
On Sun, 18 Mar 2001, Rik van Riel wrote:
>
> Indeed, having threaded apps do multiple page faults at the
> same time is the main goal of this patch. However, I don't
> see how it would be good for scalability to have multiple
> threads fault in the same page at the same time, when they
> could
On Sun, 18 Mar 2001, Linus Torvalds wrote:
> In article <[EMAIL PROTECTED]>,
> Rik van Riel <[EMAIL PROTECTED]> wrote:
> >
> >OK, I'll write some code to prevent multiple threads from
> >stepping all over each other when they pagefault at the
> >same address.
> >
> >What would be the preferred
In article <[EMAIL PROTECTED]>,
Rik van Riel <[EMAIL PROTECTED]> wrote:
>
>OK, I'll write some code to prevent multiple threads from
>stepping all over each other when they pagefault at the
>same address.
>
>What would be the preferred method of fixing this ?
>
>- fixing do_swap_page and all
On Sun, 18 Mar 2001, Mike Galbraith wrote:
> > No, this was make -j30 bzImage. (nscd was running though...)
>
> I rebooted, shut down nscd prior to testing and did 5 builds in a row
> without a single gripe. Started nscd for sixth run and instantly the
> kernel griped. Yup.. threaded apps
On Sun, 18 Mar 2001, Rik van Riel wrote:
> > VFS: Mounted root (ext2 filesystem) readonly.
> > Freeing unused kernel memory: 196k freed
> > Adding Swap: 265064k swap-space (priority 2)
> > VM: Bad swap entry 00011e00
> > VM: Bad swap entry 00058d00
> > Unused swap offset entry in swap_dup
On Sun, 18 Mar 2001, 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.
> VMA changes only happen if both the
On Sun, 18 Mar 2001, Mike Galbraith wrote:
> I gave this patch a try, and the initial results are extremely encouraging.
> Not only do I have vmstat (SCHED_RR) info in realtime with zero delays :))
> I also have a _nice_ throughput improvement. There are some worrisome
> warnings below along
On Sun, 18 Mar 2001, Rik van Riel wrote:
> On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
>
> > Right, I'm not suggesting removing that: making the mmap_sem
> > read/write is fine, but yes, we still need that semaphore.
>
> Initial patch (against 2.4.2-ac20) is available at
>
On Sun, 18 Mar 2001, Rik van Riel wrote:
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
Right, I'm not suggesting removing that: making the mmap_sem
read/write is fine, but yes, we still need that semaphore.
Initial patch (against 2.4.2-ac20) is available at
On Sun, 18 Mar 2001, Mike Galbraith wrote:
I gave this patch a try, and the initial results are extremely encouraging.
Not only do I have vmstat (SCHED_RR) info in realtime with zero delays :))
I also have a _nice_ throughput improvement. There are some worrisome
warnings below along with
On Sun, 18 Mar 2001, Rik van Riel wrote:
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 196k freed
Adding Swap: 265064k swap-space (priority 2)
VM: Bad swap entry 00011e00
VM: Bad swap entry 00058d00
Unused swap offset entry in swap_dup 00058d00
Unused
On Sun, 18 Mar 2001, Mike Galbraith wrote:
No, this was make -j30 bzImage. (nscd was running though...)
I rebooted, shut down nscd prior to testing and did 5 builds in a row
without a single gripe. Started nscd for sixth run and instantly the
kernel griped. Yup.. threaded apps pushing
In article [EMAIL PROTECTED],
Rik van Riel [EMAIL PROTECTED] wrote:
OK, I'll write some code to prevent multiple threads from
stepping all over each other when they pagefault at the
same address.
What would be the preferred method of fixing this ?
- fixing do_swap_page and all -nopage
On Sun, 18 Mar 2001, Linus Torvalds wrote:
In article [EMAIL PROTECTED],
Rik van Riel [EMAIL PROTECTED] wrote:
OK, I'll write some code to prevent multiple threads from
stepping all over each other when they pagefault at the
same address.
What would be the preferred method of fixing
On Sun, 18 Mar 2001, Rik van Riel wrote:
Indeed, having threaded apps do multiple page faults at the
same time is the main goal of this patch. However, I don't
see how it would be good for scalability to have multiple
threads fault in the same page at the same time, when they
could just
On Sun, 18 Mar 2001, Linus Torvalds wrote:
On Sun, 18 Mar 2001, Rik van Riel wrote:
Indeed, having threaded apps do multiple page faults at the
same time is the main goal of this patch. However, I don't
see how it would be good for scalability to have multiple
threads fault in the same
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
> Right, I'm not suggesting removing that: making the mmap_sem
> read/write is fine, but yes, we still need that semaphore.
Initial patch (against 2.4.2-ac20) is available at
http://www.surriel.com/patches/
> But as for the "page faults would use
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
Right, I'm not suggesting removing that: making the mmap_sem
read/write is fine, but yes, we still need that semaphore.
Initial patch (against 2.4.2-ac20) is available at
http://www.surriel.com/patches/
But as for the "page faults would use an
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
> 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
On Fri, 16 Mar 2001, Stephen C. Tweedie wrote:
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
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