linux-kernel - Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross timestamps infrastructure

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Message-ID: <20170124113517.GA2341@localhost.localdomain>
Date:   Tue, 24 Jan 2017 12:35:17 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Radim Krcmar <rkrcmar@...hat.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [patch 4/5] PTP: add PTP_SYS_OFFSET emulation via cross
 timestamps infrastructure

On Tue, Jan 24, 2017 at 09:23:29AM -0200, Marcelo Tosatti wrote:
> I'm resending v5 with native support for ->gettime and 
> ->getcrosststamps.

And can you please drop the "fake" PTP_SYS_OFFSET stuff?

Here is another reason why this is illogical.  The application can
choose how many samples to take during PTP_SYS_OFFSET.  It will choose
more samples if it wants a better picture of the offsets, but in that
case the "fake" samples would cause more computation in the kernel for
no added benefit.

Thanks,
Richard