From: Peter Zijlstra <peterz@infradead.org>
To: longman@redhat.com, mingo@redhat.com, will@kernel.org
Cc: linux-kernel@vger.kernel.org, boqun.feng@gmail.com
Subject: Re: [PATCH 3/6] locking/rwsem: Rework writer wakeup
Date: Sun, 26 Feb 2023 17:51:07 +0100 [thread overview]
Message-ID: <Y/uN+89FlTw45uiA@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <Y/t1AwGC9OoN/lFc@hirez.programming.kicks-ass.net>
On Sun, Feb 26, 2023 at 04:04:35PM +0100, Peter Zijlstra wrote:
> On Thu, Feb 23, 2023 at 01:26:45PM +0100, Peter Zijlstra wrote:
> > @@ -1072,7 +1067,7 @@ rwsem_down_read_slowpath(struct rw_semap
> > for (;;) {
> > set_current_state(state);
> > if (!smp_load_acquire(&waiter.task)) {
> > - /* Matches rwsem_mark_wake()'s smp_store_release(). */
> > + /* Matches rwsem_waiter_wake()'s smp_store_release(). */
> > break;
> > }
> > if (signal_pending_state(state, current)) {
> > @@ -1143,54 +1138,36 @@ rwsem_down_write_slowpath(struct rw_sema
> > } else {
> > atomic_long_or(RWSEM_FLAG_WAITERS, &sem->count);
>
> Found it; if we remove the try_write_lock below, then at least this
> new-waiter path needs to still do a trylock.
>
> Let me go test the other patches on top of all this and push out a fresh
> set if that all still works.
queue.git locking/core
We'll see what the robots make of it.
next prev parent reply other threads:[~2023-02-26 16:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-23 12:26 [PATCH 0/6] locking/rwsem: Rework writer wakeup and handoff Peter Zijlstra
2023-02-23 12:26 ` [PATCH 1/6] locking/rwsem: Minor code refactoring in rwsem_mark_wake() Peter Zijlstra
2023-02-23 12:26 ` [PATCH 2/6] locking/rwsem: Enforce queueing when HANDOFF Peter Zijlstra
2023-02-23 12:26 ` [PATCH 3/6] locking/rwsem: Rework writer wakeup Peter Zijlstra
2023-02-23 21:38 ` Waiman Long
2023-02-26 11:58 ` Peter Zijlstra
2023-02-26 12:00 ` Peter Zijlstra
2023-02-26 21:31 ` Waiman Long
2023-02-26 11:59 ` Peter Zijlstra
2023-02-26 15:04 ` Peter Zijlstra
2023-02-26 16:51 ` Peter Zijlstra [this message]
2023-02-27 0:22 ` Waiman Long
2023-02-27 10:31 ` Peter Zijlstra
2023-02-27 20:16 ` Waiman Long
2023-03-20 8:12 ` Peter Zijlstra
2023-03-20 17:36 ` Waiman Long
2023-02-23 12:26 ` [PATCH 4/6] locking/rwsem: Split out rwsem_reader_wake() Peter Zijlstra
2023-02-23 12:26 ` [PATCH 5/6] locking/rwsem: Unify wait loop Peter Zijlstra
2023-02-23 19:31 ` Boqun Feng
2023-02-24 1:33 ` Boqun Feng
2023-02-26 12:01 ` Peter Zijlstra
2023-02-26 18:22 ` Boqun Feng
2023-02-23 22:45 ` Waiman Long
2023-02-26 16:15 ` Peter Zijlstra
2023-02-23 12:26 ` [PATCH 6/6] locking/rwsem: Use the force Peter Zijlstra
2023-02-24 1:19 ` [PATCH 0/6] locking/rwsem: Rework writer wakeup and handoff Waiman Long
2023-02-24 11:55 ` Jiri Wiesner
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