On 09/30/2013 03:47 PM, Tim Chen wrote:
My qrwlock doesn't enable qrwlock by default. You have to use menuconfig
to explicitly enable it. Have you done that when you build the test
kernel? I am thinking of explicitly enabling it for x86 if the anon-vma
lock is converted back to a rwlock.
Yes, I
On Mon, 2013-09-30 at 12:47 -0700, Tim Chen wrote:
> On Mon, 2013-09-30 at 15:35 -0400, Waiman Long wrote:
> > On 09/30/2013 03:23 PM, Tim Chen wrote:
> > > On Mon, 2013-09-30 at 20:14 +0200, Peter Zijlstra wrote:
> > >> On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote:
> > >>> Here's the e
On Mon, 2013-09-30 at 15:35 -0400, Waiman Long wrote:
> On 09/30/2013 03:23 PM, Tim Chen wrote:
> > On Mon, 2013-09-30 at 20:14 +0200, Peter Zijlstra wrote:
> >> On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote:
> >>> Here's the exim workload data:
> >>>
> >>> rwsem improvment:
> >>> Waimai
On 09/30/2013 03:23 PM, Tim Chen wrote:
On Mon, 2013-09-30 at 20:14 +0200, Peter Zijlstra wrote:
On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote:
Here's the exim workload data:
rwsem improvment:
Waimain's patch:+2.0%
Alex+Tim's patchset:+4.8%
Waiman+Alex+Tim:+5.3%
On Mon, 2013-09-30 at 20:14 +0200, Peter Zijlstra wrote:
> On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote:
> > Here's the exim workload data:
> >
> > rwsem improvment:
> > Waimain's patch:+2.0%
> > Alex+Tim's patchset:+4.8%
> > Waiman+Alex+Tim:+5.3%
> >
> > convert r
On Mon, Sep 30, 2013 at 10:10:27AM -0700, Tim Chen wrote:
> Here's the exim workload data:
>
> rwsem improvment:
> Waimain's patch:+2.0%
> Alex+Tim's patchset:+4.8%
> Waiman+Alex+Tim:+5.3%
>
> convert rwsem to rwlock_t for root anon_vma lock
> Ingo's patch +11.7%
>
On Mon, Sep 30, 2013 at 10:03 AM, Andrew Morton
wrote:
>
> Let's convince ourselves that we won't be undoing things which will
> return to bite us?
Umm. We call them regressions, and we fix them.
As already mentioned, the original switch to a mutex didn't even have
any good explanation for it, m
On Sat, 28 Sep 2013 21:52:07 +0200 Ingo Molnar wrote:
> Here's a an almost totally untested patch to convert the anon vma lock to
> an rwlock_t.
Both the anon vma lock and i_mmap_lock used to be spinlocks. Peter
turned them both into sleeping locks in this series:
https://lkml.org/lkml/2011/4/
On Sat, 2013-09-28 at 21:52 +0200, Ingo Molnar wrote:
> * Linus Torvalds wrote:
>
> > On Sat, Sep 28, 2013 at 12:37 PM, Ingo Molnar wrote:
> > >
> > > - down_write_nest_lock(&anon_vma->root->rwsem,
> > > &mm->mmap_sem);
> > > + down_write_nest_lock(&anon_vma->root->r
On Sat, Sep 28, 2013 at 09:52:07PM +0200, Ingo Molnar wrote:
> Index: tip/mm/mmap.c
> ===
> --- tip.orig/mm/mmap.c
> +++ tip/mm/mmap.c
> @@ -2955,15 +2955,15 @@ static void vm_lock_anon_vma(struct mm_s
>* The LSB of hea
On Sat, Sep 28, 2013 at 09:52:07PM +0200, Ingo Molnar wrote:
> Index: tip/mm/rmap.c
> ===
> --- tip.orig/mm/rmap.c
> +++ tip/mm/rmap.c
> @@ -98,12 +98,12 @@ static inline void anon_vma_free(struct
>* page_lock_anon_vma_read()
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