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See http://www.infradead.org/rpr.html --=-RrWHcmlah0aWtoEAjnBh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-10-22 at 15:52 +0200, Miroslav Lichvar wrote: > On Thu, Oct 22, 2026 at 11:05:18AM +0200, Rodolfo Giometti wrote: > > On 21/10/26 16:37, David Woodhouse wrote: > > > Ping? Patches 1-4 of this should be ready to merge now. > > >=20 > > > So is number 5 as far as I'm concerned, but I'm happy to entertain > > > further discussion if anyone has an opinion they want to share. > >=20 > > Number 5 changes the timestamps PPS_FETCH returns to userspace, so I'd > > still like an explicit OK from its users, such as chrony and others, > > before it goes in. >=20 > I'm ok with it. As described, I don't think it's going to cause any > issues, especially for low-rate PPS, but I don't like much that the > clock is inconsistent with other sources of timestamps that the > application is getting. That can be addressed later. Yeah, I do wonder if at least adjtimex() should report a 'corrected' time. But as you say, we can address that later. I'm still trying to work out the get/set reference stuff which is what I need to do next. > For the PTP_SYS_OFFSET_EXTENDED ioctl, is there a possibility the > application could see an out-of-order system clock timestamp in the > list? Theoretically, the snapshot correction is trading monotonicity for accuracy =E2=80=94 it asks ktime_get_snapshot_id() to tell the *truth* by compensating for the known ntp_error, even if the time reported is "earlier" than a timestamp which was previously reported. So the time reported by a tickless kernel can wander around the "ideal" all it likes, and userspace still gets to discipline the ideal.=20 In practice, it's only going to be non-monotonic w.r.t. the "fast" time reported by clock_gettime(), not with other samples obtained through ktime_get_snapshot_id().=20 The first patch in this series fixes the known case where ntp_error retrospectively jumps, which would cause such a non-monotonicity in the snapshots themselves. --=-RrWHcmlah0aWtoEAjnBh Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz 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