linux-kernel - Re: [PATCH v3 1/2] x86, msr: allow rdmsr_safe_on

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Date:   Tue, 27 Mar 2018 11:36:48 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Eric Dumazet <edumazet@...gle.com>, Borislav Petkov <bp@...en8.de>,
        Eric Dumazet <eric.dumazet@...il.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Hugh Dickins <hughd@...gle.com>, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH v3 1/2] x86, msr: allow rdmsr_safe_on_cpu() to schedule


* Thomas Gleixner <tglx@...utronix.de> wrote:

> On Mon, 26 Mar 2018, Eric Dumazet wrote:
> > On Sun, Mar 25, 2018 at 11:40 PM Ingo Molnar <mingo@...nel.org> wrote:
> > > If performance matters then the relevant MSR events should be added and
> > > gsysd
> > > should be updated to support MSR events.
> > >
> > 
> > Thanks for the hints Ingo. I have forwarded them.
> > 
> > I am pretty sure gsysd was designed and written years before perf even
> > existed,
> > so I am not sure all this will ever be implemented.
> > 
> > I guess I will apply the kernel patches locally for the time being.
> 
> I'm still considering to merge them because there is no real reason not to
> do so. The interfaces exist and are used. Reducing their impact is
> certainly worthwhile.

Ok, that's a good point, and the patches themselves are sane:

  Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo