From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36D0E245012; Tue, 1 Sep 2026 23:57:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788307048; cv=none; b=cIjveMVztpoNJVa3k+k1JAYkkcaFvvmfJWjDg6ohLvy6KvKZvSwJb2D6KihlqlSlRPVt7cATcE2PQo9SK8haizacv3yoxcRdAGernlmqqzlZQ3mswie4WCSwjBUcrOWO5UiovshSaodyaJmw54Ekv0PrdShlvoQBInNzEiayeew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788307048; c=relaxed/simple; bh=+AYzORvlm/BNpkeEMWLJEZAkuODB/gX68fNHFf7FzBQ=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Cbuppeelva50ctHJdcYHyNrrGV5Ry3N/hVrA2Ae+d1x2uJgfjhCJQy7kN0biN+G5goDAK7IRicAozDN1FHmmm/Br5+obtk16Z/BM+/YgisSyceWsaGgyoG2JtcOtzOJOB+YBLMZPLoIuuZabGL30AVJP3c9hkvdp6GuNNTzvcwA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=atil5T13; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="atil5T13" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=F2pUamGclC2rpmeXbHBKIv+yRXdSgUNe5Y9hZMTo4wg=; b=atil5T134RoTVBnAj6iOyUFgCE KN071v/+7DhtaJm1iyIJUPtczjGykbv5pjYGucT/CGzJK5ZhUXyn+vQHi9F9+iq+V6xAlEXtx3zyn WvdVd2rXCPNRi93QV0Jlc/aLUO97j8GKRIABTKsPTqai8WbEthboWuz7GmneyqV82+sYMAP3EEmJb QA3ADlPW30MmHYZSAJcxSYBRB510r0FIoQak7gWN8HOySqw9RMWyjnZQEz2G39ygpC72E3gtoiDtn LWJ/Wca/o/qY3B1mRskxvqccu5/D6xREh9NRVvLptZydSRFEDxqtrJri17pw+EaHMpPeCHgjYtMf0 tzIc6v6w==; Received: from [2001:8b0:10b:5:d943:510:b128:832d] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x1YLt-00000005xIS-0071; Tue, 01 Sep 2026 23:57:17 +0000 Message-ID: Subject: Re: [PATCH v4 3/4] pps: Always use ktime_get_snapshot_id() for pps_get_ts() From: David Woodhouse To: Rodolfo Giometti , Richard Cochran , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Stultz , Thomas Gleixner , Stephen Boyd , Miroslav Lichvar , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Alexander Gordeev Date: Wed, 02 Sep 2026 00:56:56 +0100 In-Reply-To: <920a2d70-c1ec-452b-8fc4-aebf1f6af412@enneenne.com> References: <20260829210041.40649-1-dwmw2@infradead.org> <20260829210041.40649-4-dwmw2@infradead.org> <920a2d70-c1ec-452b-8fc4-aebf1f6af412@enneenne.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-FF7WWY51tBUZK59kGipG" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-FF7WWY51tBUZK59kGipG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-09-01 at 17:35 +0200, Rodolfo Giometti wrote: > On Sat, 2026-08-29 at 21:57 +0100, David Woodhouse wrote: > > Rather than using that more accurate timestamp *only* in the case where > > CONFIG_NTP_PPS is enabled, do so unconditionally. > >=20 > > =C2=A0 static inline void pps_get_ts(struct pps_event_time *ts) > > =C2=A0 { > > -#ifdef CONFIG_NTP_PPS > > =C2=A0=C2=A0 struct system_time_snapshot snap; > > =C2=A0=20 > > =C2=A0=C2=A0 ktime_get_snapshot_id(CLOCK_REALTIME, &snap); > > =C2=A0=C2=A0 ts->ts_real =3D ktime_to_timespec64(snap.systime); > > +#ifdef CONFIG_NTP_PPS > > =C2=A0=C2=A0 ts->ts_raw =3D ktime_to_timespec64(snap.monoraw); > > -#else > > - ktime_get_real_ts64(&ts->ts_real); > > =C2=A0 #endif > > =C2=A0 } >=20 > Why are you removing ktime_get_real_ts64()? Because it's inaccurate. > The commit message says you are using the more accurate timestamp > unconditionally. What the diff does is delete the !CONFIG_NTP_PPS > branch. Those are not the same thing, and the second one changes an > ABI: ts_real reaches userspace through PPS_FETCH on /dev/ppsN and > through /sys/class/pps/ppsX/assert, documented in > Documentation/ABI/testing/sysfs-pps and unchanged since 2008. Until > now it came from ktime_get_real_ts64(), the same clock userspace reads > with clock_gettime(CLOCK_REALTIME). After your patch it does not. Hm? After the patch it still reports CLOCK_REALTIME. Just more accurately. Which is exactly what the commit message was trying to say. > That needs a good reason and the commit message does not give one. > Give me that first. Until then the details do not matter. ktime_get_real_ts64() returns an approximate value of CLOCK_REALTIME which is limited by the quantisation of the multiplier in the kernel's core timekeeping. ktime_get_snapshot_id(CLOCK_REALTIME) returns a value which is *corrected* for that drift. > Separately: are we sure that calling ktime_get_snapshot_id() does not > introduce much larger delays than ktime_get_real_ts64()? pps_get_ts() > runs in hard IRQ, and in pps-gpio it is the first statement of the > handler. Whatever it costs sits between the edge and the timestamp, > and that is the one thing PPS has to keep short. The critical measure here is the time from the edge to the actual tk_clock_read() or tk_clock_read_snapshot() call which captures the hardware counter value which is converted into the CLOCK_REALTIME reading. ktime_get_snapshot_id() is what's been called in the CONFIG_NTP_PPS case for a very long time =E2=80=94 we're just making it use that same path unconditionally. The difference between that and ktime_get_real_ts64() is tiny, but non-zero =E2=80=94 it's about 2ns to the snapshot on my x86 te= st host. Even ktime_get_real_ts64() is doing things before the snapshot that perhaps it needn't (setting ts->tv_sec), and could save us a couple of cycles. If this is a real concern, we could certainly look at putting the clock snapshot as early as possible and optimising the common case of clock_id =3D=3D CLOCK_REALTIME.=20 > I would like to see that measured on something other than an x86 VM > with a TSC. A small 32-bit ARM board is what I worry about. Ack. 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