Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed

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Subject: Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Wed, 20 Oct 2021 14:04:23 +0200
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, kvm <kvm@xxxxxxxxxxxxxxx>, Davidlohr Bueso <dave@xxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>
In-reply-to: <CANRm+CyX+ZZh+LbLPBXEfMoExkx78qHpP-=yFCop9gX+LQeWDQ@mail.gmail.com>
References: <20211020110638.797389-1-pbonzini@redhat.com> <YW/61zpycsD8/z4g@hirez.programming.kicks-ass.net> <98a72081-6a2b-b644-d029-edd03da84135@redhat.com> <CANRm+CyX+ZZh+LbLPBXEfMoExkx78qHpP-=yFCop9gX+LQeWDQ@mail.gmail.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0

On 20/10/21 14:01, Wanpeng Li wrote:

Yes, in the attachment.

     Wanpeng

This one does not have CONFIG_PREEMPT=y, let alone CONFIG_PREEMPT_RCU.It's completely impossible that this patch has an effect without thoseoptions.


Paolo

References:
- [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed
  - From: Paolo Bonzini
- Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed
  - From: Peter Zijlstra
- Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed
  - From: Paolo Bonzini

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