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Groups > linux.kernel > #1536020
| From | Oleg Nesterov <oleg@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues |
| Date | 2016-12-05 12:50 +0100 |
| Message-ID | <sKZWp-3YN-1@gated-at.bofh.it> (permalink) |
| References | <sEWye-2tW-9@gated-at.bofh.it> <sEWye-2tW-29@gated-at.bofh.it> <sK85H-3yk-1@gated-at.bofh.it> <sKWYx-2e2-17@gated-at.bofh.it> <sKZD4-3S7-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 12/05, Oleg Nesterov wrote:
>
> Yes, but on a second thought task_rcu_dereference() won't really help,
I forgot to explain why, see below.
> #define xxx_wait_event(xxx, event) {
> // comment to explain why
> WARN_ON(current->exit_state);
Otherwise this process/thread can be already (auto)reaped and wakeup
can't rely on rcu.
And task_rcu_dereference() can't help because it can return NULL in
this case.
Oleg.
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[PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Davidlohr Bueso <dave@stgolabs.net> - 2016-12-03 03:20 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Peter Zijlstra <peterz@infradead.org> - 2016-12-05 09:40 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Oleg Nesterov <oleg@redhat.com> - 2016-12-05 12:30 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Oleg Nesterov <oleg@redhat.com> - 2016-12-05 12:50 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Davidlohr Bueso <dave@stgolabs.net> - 2016-12-05 18:40 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Oleg Nesterov <oleg@redhat.com> - 2016-12-05 18:20 +0100
Re: [PATCH v2 2/3] locking/percpu-rwsem: Rework writer block/wake to not use wait-queues Oleg Nesterov <oleg@redhat.com> - 2016-12-05 18:20 +0100
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