From: Linus Torvalds
> Sent: 30 December 2023 20:59
>
> On Sat, 30 Dec 2023 at 12:41, Linus Torvalds
> wrote:
> >
> > UNTESTED patch to just do the "this_cpu_write()" parts attached.
> > Again, note how we do end up doing that this_cpu_ptr conversion later
> > anyway, but at least it's off the
From: Linus Torvalds
> Sent: 30 December 2023 20:41
>
> On Fri, 29 Dec 2023 at 12:57, David Laight wrote:
> >
> > this_cpu_ptr() is rather more expensive than raw_cpu_read() since
> > the latter can use an 'offset from register' (%gs for x86-84).
> >
> > Add a 'self' field to 'struct
From: Waiman Long
> Sent: 31 December 2023 03:04
> The presence of debug_smp_processor_id in your compiled code is likely
> due to the setting of CONFIG_DEBUG_PREEMPT in your kernel config.
>
> #ifdef CONFIG_DEBUG_PREEMPT
> extern unsigned int debug_smp_processor_id(void);
> # define
On 12/30/23 06:35, David Laight wrote:
From: Ingo Molnar
Sent: 30 December 2023 11:09
* Waiman Long wrote:
On 12/29/23 15:57, David Laight wrote:
this_cpu_ptr() is rather more expensive than raw_cpu_read() since
the latter can use an 'offset from register' (%gs for x86-84).
Add a
From: Ingo Molnar
> Sent: 30 December 2023 20:38
>
> * David Laight wrote:
>
> > bool osq_lock(struct optimistic_spin_queue *lock)
> > {
> > - struct optimistic_spin_node *node = this_cpu_ptr(_node);
> > + struct optimistic_spin_node *node = raw_cpu_read(osq_node.self);
> > struct
On Sat, 30 Dec 2023 at 12:41, Linus Torvalds
wrote:
>
> UNTESTED patch to just do the "this_cpu_write()" parts attached.
> Again, note how we do end up doing that this_cpu_ptr conversion later
> anyway, but at least it's off the critical path.
Also note that while 'this_cpu_ptr()' doesn't
On Fri, 29 Dec 2023 at 12:57, David Laight wrote:
>
> this_cpu_ptr() is rather more expensive than raw_cpu_read() since
> the latter can use an 'offset from register' (%gs for x86-84).
>
> Add a 'self' field to 'struct optimistic_spin_node' that can be
> read with raw_cpu_read(), initialise on
From: Ingo Molnar
> Sent: 30 December 2023 11:09
>
>
> * Waiman Long wrote:
>
> > On 12/29/23 15:57, David Laight wrote:
> > > this_cpu_ptr() is rather more expensive than raw_cpu_read() since
> > > the latter can use an 'offset from register' (%gs for x86-84).
> > >
> > > Add a 'self' field
* Waiman Long wrote:
> On 12/29/23 15:57, David Laight wrote:
> > this_cpu_ptr() is rather more expensive than raw_cpu_read() since
> > the latter can use an 'offset from register' (%gs for x86-84).
> >
> > Add a 'self' field to 'struct optimistic_spin_node' that can be
> > read with
On 12/29/23 15:57, David Laight wrote:
this_cpu_ptr() is rather more expensive than raw_cpu_read() since
the latter can use an 'offset from register' (%gs for x86-84).
Add a 'self' field to 'struct optimistic_spin_node' that can be
read with raw_cpu_read(), initialise on first call.
this_cpu_ptr() is rather more expensive than raw_cpu_read() since
the latter can use an 'offset from register' (%gs for x86-84).
Add a 'self' field to 'struct optimistic_spin_node' that can be
read with raw_cpu_read(), initialise on first call.
Signed-off-by: David Laight
---
11 matches
Mail list logo
