linux-kernel - Re: [PATCH v2] kvm: Replace vcpu->swait with rcuwait

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Message-ID: <20200420205641.6sgsllj6pmsnwrvp@linux-p48b>
Date:   Mon, 20 Apr 2020 13:56:41 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Marc Zyngier <maz@...nel.org>
Cc:     tglx@...utronix.de, pbonzini@...hat.com, kvm@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>, peterz@...radead.org,
        torvalds@...ux-foundation.org, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        linux-mips@...r.kernel.org, Paul Mackerras <paulus@...abs.org>,
        joel@...lfernandes.org, will@...nel.org,
        kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v2] kvm: Replace vcpu->swait with rcuwait

On Mon, 20 Apr 2020, Marc Zyngier wrote:

>This looks like a change in the semantics of the tracepoint. Before this
>change, 'waited' would have been true if the vcpu waited at all. Here, 
>you'd
>have false if it has been interrupted by a signal, even if the vcpu 
>has waited
>for a period of time.

Hmm but sleeps are now uninterruptible as we're using TASK_IDLE.

Thanks,
Davidlohr