From: Peter Zijlstra <peterz@infradead.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
K Prateek Nayak <kprateek.nayak@amd.com>,
David Matlack <dmatlack@google.com>,
Juergen Gross <jgross@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Subject: Re: [PATCH v2 08/12] sched/wait: Drop WQ_FLAG_EXCLUSIVE from add_wait_queue_priority()
Date: Tue, 20 May 2025 21:18:16 +0200 [thread overview]
Message-ID: <20250520191816.GJ16434@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20250519185514.2678456-9-seanjc@google.com>
On Mon, May 19, 2025 at 11:55:10AM -0700, Sean Christopherson wrote:
> Drop the setting of WQ_FLAG_EXCLUSIVE from add_wait_queue_priority() to
> differentiate it from add_wait_queue_priority_exclusive(). The one and
> only user add_wait_queue_priority(), Xen privcmd's irqfd_wakeup(),
> unconditionally returns '0', i.e. doesn't actually operate in exclusive
> mode.
I find:
drivers/hv/mshv_eventfd.c: add_wait_queue_priority(wqh, &irqfd->irqfd_wait);
drivers/xen/privcmd.c: add_wait_queue_priority(wqh, &kirqfd->wait);
I mean, it might still be true and all, but hyperv seems to also use
this now.
next prev parent reply other threads:[~2025-05-20 19:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-19 18:55 [PATCH v2 00/12] KVM: Make irqfd registration globally unique Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 01/12] KVM: Use a local struct to do the initial vfs_poll() on an irqfd Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 02/12] KVM: Acquire SCRU lock outside of irqfds.lock during assignment Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 03/12] KVM: Initialize irqfd waitqueue callback when adding to the queue Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 04/12] KVM: Add irqfd to KVM's list via the vfs_poll() callback Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 05/12] KVM: Add irqfd to eventfd's waitqueue while holding irqfds.lock Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 06/12] sched/wait: Add a waitqueue helper for fully exclusive priority waiters Sean Christopherson
2025-05-20 19:17 ` Peter Zijlstra
2025-05-20 20:57 ` Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 07/12] KVM: Disallow binding multiple irqfds to an eventfd with a priority waiter Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 08/12] sched/wait: Drop WQ_FLAG_EXCLUSIVE from add_wait_queue_priority() Sean Christopherson
2025-05-20 19:18 ` Peter Zijlstra [this message]
2025-05-20 22:20 ` Sean Christopherson
2025-05-21 11:42 ` Peter Zijlstra
2025-05-21 14:44 ` Michael Kelley
2025-05-21 15:05 ` Sean Christopherson
2025-05-21 13:22 ` Jürgen Groß
2025-05-19 18:55 ` [PATCH v2 09/12] KVM: Drop sanity check that per-VM list of irqfds is unique Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 10/12] KVM: selftests: Assert that eventfd() succeeds in Xen shinfo test Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 11/12] KVM: selftests: Add utilities to create eventfds and do KVM_IRQFD Sean Christopherson
2025-05-19 18:55 ` [PATCH v2 12/12] KVM: selftests: Add a KVM_IRQFD test to verify uniqueness requirements Sean Christopherson
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