From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan Beulich" Subject: Re: [PATCH 4/8] x86/time: calibrate TSC against platform timer Date: Wed, 03 Aug 2016 03:32:23 -0600 Message-ID: <57A1D647020000780010219C@prv-mh.provo.novell.com> References: <576140F302000078000F52FE@prv-mh.provo.novell.com> <576149E202000078000F53A1@prv-mh.provo.novell.com> <6412dddf-5702-c84f-e922-13f6d1081536@citrix.com> <5768258A02000078000F6F93@prv-mh.provo.novell.com> <1a7deb9b-1472-a58c-c0e1-864dcc610266@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bUsXM-0004a6-PY for xen-devel@lists.xenproject.org; Wed, 03 Aug 2016 09:32:28 +0000 In-Reply-To: <1a7deb9b-1472-a58c-c0e1-864dcc610266@citrix.com> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Andrew Cooper Cc: xen-devel , Dario Faggioli , Joao Martins List-Id: xen-devel@lists.xenproject.org Pj4+IE9uIDAyLjA4LjE2IGF0IDIxOjI1LCA8YW5kcmV3LmNvb3BlcjNAY2l0cml4LmNvbT4gd3Jv dGU6Cj4gT24gMjAvMDYvMTYgMTY6MTksIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+PiBPbiAyMC4w Ni4xNiBhdCAxNjoyMCwgPGFuZHJldy5jb29wZXIzQGNpdHJpeC5jb20+IHdyb3RlOgo+Pj4gT24g MTUvMDYvMTYgMTE6MjgsIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+IC0tLSBhL3hlbi9hcmNoL3g4 Ni9pODI1OS5jCj4+Pj4gKysrIGIveGVuL2FyY2gveDg2L2k4MjU5LmMKPj4+PiBAQCAtMzU5LDEy ICszNTksNyBAQCB2b2lkIF9faW5pdCBpbml0X0lSUSh2b2lkKQo+Pj4+ICAKPj4+PiAgICAgIGFw aWNfaW50cl9pbml0KCk7Cj4+Pj4gIAo+Pj4+IC0gICAgLyogU2V0IHRoZSBjbG9jayB0byBIWiBI eiAqLwo+Pj4+IC0jZGVmaW5lIENMT0NLX1RJQ0tfUkFURSAxMTkzMTgyIC8qIGNyeXN0YWwgZnJl cSAoSHopICovCj4+Pj4gLSNkZWZpbmUgTEFUQ0ggKCgoQ0xPQ0tfVElDS19SQVRFKSsoSFovMikp L0haKQo+Pj4+IC0gICAgb3V0Yl9wKDB4MzQsIFBJVF9NT0RFKTsgICAgICAgIC8qIGJpbmFyeSwg bW9kZSAyLCBMU0IvTVNCLCBjaCAwICovCj4+Pj4gLSAgICBvdXRiX3AoTEFUQ0ggJiAweGZmLCBQ SVRfQ0gwKTsgLyogTFNCICovCj4+Pj4gLSAgICBvdXRiKExBVENIID4+IDgsIFBJVF9DSDApOyAg ICAgLyogTVNCICovCj4+Pj4gKyAgICBwcmVpbml0X3BpdCgpOwo+Pj4gVGhpcyBoaWdobGlnaHRz IHRoZSBmYWN0IHRoYXQgd2UgaGF2ZSB0d28gdW5jb25kaXRpb25hbCBjYWxscyB0bwo+Pj4gcHJl aW5pdF9waXQoKSBkdXJpbmcgc3RhcnR1cCwgd2hpY2ggaXMgb25lIHRvbyBtYW55Lgo+Pj4KPj4+ IGluaXRfSVJRKCkgaXMgY2FsbGVkIHJhdGhlciBlYXJsaWVyIHRoYW4gZWFybHlfdGltZV9pbml0 KCksIGJ1dCBJIGNhbid0Cj4+PiBzcG90IGFueXRoaW5nIGluYmV0d2VlbiB0aGUgdHdvIGNhbGxz IHdoaWNoIHdvdWxkIHJlcXVpcmUgdGhlIFBJVCB0byBiZQo+Pj4gc2V0IHVwLiAgQUZBSUNULCBp dCBpcyBzYWZlIHRvIGp1c3QgZHJvcCB0aGUgcHJlaW5pdF9waXQoKSBjYWxsIGhlcmUuCj4+IExB UElDIGluaXRpYWxpemF0aW9uIG1ha2VzIHVzZSBvZiB0aGUgUElULCBhbmQgSSB0aGluayB0aGF0 IHdvdWxkCj4+IGJyZWFrIHdoZW4gcmVtb3ZpbmcgaXQgaGVyZS4gQW5kIHNpbmNlIGRvaW5nIGl0 IHR3aWNlIGlzIGJlbmlnbiwKPj4gSSdkIGFsc28gbGlrZSB0byBub3QgZHJvcCBpdCBmcm9tIGVh cmx5X3RpbWVfaW5pdCgpLgo+IAo+IFdoZXJlPyBMQVBJQyBpbml0aWFsaXNhdGlvbiBpcyBiZWZv cmUgdGhpcyBwb2ludCAtIGl0cyBoaWdoZXIgdXAgaW4KPiBpbml0X0lSUSgpIHNvIHN1cmVseSBj YW4ndCBkZXBlbmQgb24gdGhpcyBjdXJyZW50bHkgd29ya2luZy4KCkhtbSwgbG9va3MgbGlrZSBt eSBlYXJsaWVyIGZsb3cgYW5hbHlzaXMgd2FzIHdyb25nIChvciBwZXJoYXBzCmJhc2VkIG9uIHRo ZSBvbGQgcGxhY2VtZW50IG9mIHRoZSBjYWxsIHRvIGluaXRfcGxhdGZvcm1fdGltZXIoKSBpbgpp bml0X3hlbl90aW1lKCkpOgoKX19zdGFydF94ZW4oKQotPiBbbGluZSAxMzg4XSBpbml0X0lSUSgp Ci0+IFtsaW5lIDE0MjldIGVhcmx5X3RpbWVfaW5pdCgpCi0+IFtsaW5lIDE0NDddIHNtcF9wcmVw YXJlX2NwdXMoKQogLT4gc2V0dXBfYm9vdF9BUElDX2Nsb2NrKCkKICAtPiBjYWxpYnJhdGVfQVBJ Q19jbG9jaygpCi0+IFtsaW5lIDE0NTZdIGluaXRfeGVuX3RpbWUoKTsKCkxldCBtZSB2ZXJpZnkg dGhhdCByZW1vdmluZyB0aGUgb25lIGhlcmUgYWxzbyB3b3JrcyBpbiBwcmFjdGljZS4KCj4gQXMg Zm9yIGJlbmlnbiwgYXQgdGhlIGJlc3QgaXQgaXMgYSB3YXN0ZSBvZiB0aW1lLCBhbmQgb24gcmVk dWNlZAo+IGhhcmR3YXJlIHBsYXRmb3Jtcywgd3JvbmcuICBXZSBzaG91bGRuJ3QgYmUgcHJvcGFn YXRpbmcgcHJvYmxlbXMgbGlrZSB0aGVzZS4KPiAKPj4KPj4+PiBAQCAtMzQwLDcgKzM0OCw4IEBA IHN0YXRpYyBzdHJ1Y3QgcGxhdGZvcm1fdGltZXNvdXJjZSBfX2luaXQKPj4+PiAgICAgIC5mcmVx dWVuY3kgPSBDTE9DS19USUNLX1JBVEUsCj4+Pj4gICAgICAucmVhZF9jb3VudGVyID0gcmVhZF9w aXRfY291bnQsCj4+Pj4gICAgICAuY291bnRlcl9iaXRzID0gMzIsCj4+Pj4gLSAgICAuaW5pdCA9 IGluaXRfcGl0Cj4+Pj4gKyAgICAuaW5pdCA9IGluaXRfcGl0LAo+Pj4+ICsgICAgLnJlc3VtZSA9 IHJlc3VtZV9waXQKPj4+IFBsZWFzZSBhZGQgYSByZWR1bmRhbnQgY29tbWEgYXQgdGhlIGVuZCwg dG8gcmVkdWNlIHRoZSBuZXh0IGRpZmYgdG8KPj4+IGNoYW5nZSB0aGlzIGJsb2NrLgo+PiBXZWxs LCBJJ2QgbGlrZSB0aGUgdGhyZWUgaW5zdGFuY2UgdG8gcmVtYWluIGNvbnNpc3RlbnQgaW4gdGhp cyByZWdhcmQKPj4gKHlldCB0b3VjaGluZyB0aGUgb3RoZXJzIGRvZXNuJ3Qgc2VlbSB3YXJyYW50 ZWQpLiBBbmQgYSBjaGFuZ2UKPj4gaGVyZSBpc24ndCBhbGwgdGhhdCBsaWtlbHkuCj4gCj4gVGhp cyBpcyBqdXN0IGxpa2UgYW55IG90aGVyIGJpdCBvZiBzdHlsZSAtIGl0IHNob3VsZCBiZSBmaXhl ZCB1cCB3aGlsZQo+IGVkaXRpbmcgZXZlbiBpZiB0aGUgcmVzdCBvZiB0aGUgZmlsZSBpc24ndCBj b21wbGV0ZWx5IHVwIHRvIHNjcmF0Y2guCgpXZWxsLCBJIGFjdHVhbGx5IGhhZCBkb25lIHRoYXQg cGFydCBhbHJlYWR5LgoKSmFuCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9y ZwpodHRwczovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==