linux-kernel - Re: [patch 0/5] optionally sync per-CPU vmstats counter on return to userspace

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Date:   Tue, 6 Jul 2021 11:17:23 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Nitesh Lal <nilal@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch 0/5] optionally sync per-CPU vmstats counter on return to
 userspace

On Tue, Jul 06, 2021 at 11:09:20AM -0300, Marcelo Tosatti wrote:
> > > And I suspect some other people won't like much a new extension
> > > to isolcpus.
> > 
> > Why is that so? 
> 
> Ah, yes, that would be PeterZ.
> 
> IIRC his main point was that its not runtime changeable.
> We can (partially fix that), if that is the case.
> 
> Peter, was that the only problem you saw with isolcpus interface?

Oh, and BTW, isolcpus=managed_irq flag was recently added due to another
isolation bug.

This problem is the same category, so i don't see why it should be
treated especially (yes, i agree isolcpus= interface should be 
improved, but thats what is available today).