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

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Message-ID: <20210706165346.GA73435@fuller.cnet>
Date:   Tue, 6 Jul 2021 13:53:46 -0300
From:   Marcelo Tosatti <mtosatti@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        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>
Subject: Re: [patch 0/5] optionally sync per-CPU vmstats counter on return to
 userspace

On Tue, Jul 06, 2021 at 06:15:24PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 06, 2021 at 11:09:20AM -0300, Marcelo Tosatti wrote:
> > Peter, was that the only problem you saw with isolcpus interface?
> 
> It needs to die, it's a piece of crap. Use cpusets already.

OK, can do that. So how about, in addition to this patch (which again,
is needed for current systems, so we will have to keep extending it
for the current kernels which patches are backported to, as done with
managed_irqs... note most of the code that is integrated will be reused,
just a different path that enables it).

So what was discussed before was the following:

https://lkml.org/lkml/2020/9/9/1120

Do you have any other comments 
(on the "new file per isolation feature" structure) ?

Would probably want to split the flags per-CPU as well.