On Fri, Jun 7, 2019 at 12:27 AM Jan Glauber wrote:
>
> To clarify, with 224 threads & CPUs queued_spin_lock_slowpath is the top hit
> even without a retry limit in lockref. This could be unrelated to the lockref
> fallback, it looks like it's coming from the spinlock in:
> do_sys_open -> g
On Thu, Jun 06, 2019 at 10:28:12AM +, Jan Glauber wrote:
> On Thu, Jun 06, 2019 at 10:41:54AM +0100, Will Deacon wrote:
> > On Thu, Jun 06, 2019 at 08:03:27AM +, Jan Glauber wrote:
> > > On Wed, Jun 05, 2019 at 01:16:46PM -0700, Linus Torvalds wrote:
> > > > On Wed, Jun 5, 2019 at 6:49 AM J
On Thu, Jun 06, 2019 at 10:41:54AM +0100, Will Deacon wrote:
> On Thu, Jun 06, 2019 at 08:03:27AM +, Jan Glauber wrote:
> > On Wed, Jun 05, 2019 at 01:16:46PM -0700, Linus Torvalds wrote:
> > > On Wed, Jun 5, 2019 at 6:49 AM Jan Glauber wrote:
> > > >
> > > > Add an upper bound to the loop to
On Thu, Jun 06, 2019 at 08:03:27AM +, Jan Glauber wrote:
> On Wed, Jun 05, 2019 at 01:16:46PM -0700, Linus Torvalds wrote:
> > On Wed, Jun 5, 2019 at 6:49 AM Jan Glauber wrote:
> > >
> > > Add an upper bound to the loop to force the fallback to spinlocks
> > > after some time. A retry value of
On Wed, Jun 05, 2019 at 01:16:46PM -0700, Linus Torvalds wrote:
> On Wed, Jun 5, 2019 at 6:49 AM Jan Glauber wrote:
> >
> > Add an upper bound to the loop to force the fallback to spinlocks
> > after some time. A retry value of 100 should not impact any hardware
> > that does not have this issue.
On Wed, Jun 5, 2019 at 6:49 AM Jan Glauber wrote:
>
> Add an upper bound to the loop to force the fallback to spinlocks
> after some time. A retry value of 100 should not impact any hardware
> that does not have this issue.
>
> With the retry limit the performance of an open-close testcase
> impro
The lockref cmpxchg loop is unbound as long as the spinlock is not
taken. Depending on the hardware implementation of compare-and-swap
a high number of loop retries might happen.
Add an upper bound to the loop to force the fallback to spinlocks
after some time. A retry value of 100 should not impa
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