From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joao Martins Subject: Re: [PATCH v4 2/5] x86/time: implement tsc as clocksource Date: Mon, 19 Sep 2016 18:54:38 +0100 Message-ID: <57E0265E.80006@oracle.com> References: <1473874670-4986-1-git-send-email-joao.m.martins@oracle.com> <1473874670-4986-3-git-send-email-joao.m.martins@oracle.com> <57DFD678020000780010FEAF@prv-mh.provo.novell.com> <57E00E18.8050405@oracle.com> <57E02D85020000780011040B@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bm2kq-0007Y0-Mw for xen-devel@lists.xenproject.org; Mon, 19 Sep 2016 17:53:20 +0000 In-Reply-To: <57E02D85020000780011040B@prv-mh.provo.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Jan Beulich Cc: Andrew Cooper , xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org T24gMDkvMTkvMjAxNiAwNToyNSBQTSwgSmFuIEJldWxpY2ggd3JvdGU6Cj4+Pj4gT24gMTkuMDku MTYgYXQgMTg6MTEsIDxqb2FvLm0ubWFydGluc0BvcmFjbGUuY29tPiB3cm90ZToKPj4gT24gMDkv MTkvMjAxNiAxMToxMyBBTSwgSmFuIEJldWxpY2ggd3JvdGU6Cj4+Pj4+PiBPbiAxNC4wOS4xNiBh dCAxOTozNywgPGpvYW8ubS5tYXJ0aW5zQG9yYWNsZS5jb20+IHdyb3RlOgo+Pj4+IFNpbmNlIGI2 NDQzOGM3YyAoIng4Ni90aW1lOiB1c2UgY29ycmVjdCAobG9jYWwpIHRpbWUgc3RhbXAgaW4KPj4+ PiBjb25zdGFudC1UU0MgY2FsaWJyYXRpb24gZmFzdCBwYXRoIikgdXBkYXRlcyB0byBjcHUgdGlt ZSB1c2UgbG9jYWwKPj4+PiBzdGFtcHMsIHdoaWNoIG1lYW5zIHBsYXRmb3JtIHRpbWVyIGlzIG9u bHkgdXNlZCB0byBzZWVkIHRoZSBpbml0aWFsCj4+Pj4gY3B1IHRpbWUuICBXaXRoIGNsb2Nrc291 cmNlPXRzYyB0aGVyZSBpcyBubyBuZWVkIHRvIGJlIGluIHN5bmMgd2l0aAo+Pj4+IGFub3RoZXIg Y2xvY2tzb3VyY2UsIHNvIHdlIHJlc2VlZCB0aGUgbG9jYWwvbWFzdGVyIHN0YW1wcyB0byBiZSB2 YWx1ZXMKPj4+PiBvZiBUU0MgYW5kIHVwZGF0ZSB0aGUgcGxhdGZvcm0gdGltZSBzdGFtcHMgYWNj b3JkaW5nbHkuIFRpbWUKPj4+PiBjYWxpYnJhdGlvbiBpcyBzZXQgdG8gMXNlYyBhZnRlciB3ZSBz d2l0Y2ggdG8gVFNDLCB0aHVzIHRoZXNlIHN0YW1wcwo+Pj4+IGFyZSByZXNlZWRlZCB0byBhbHNv IGVuc3VyZSBtb25vdG9uaWMgcmV0dXJuaW5nIHZhbHVlcyByaWdodCBhZnRlciB0aGUKPj4+PiBw b2ludCB3ZSBzd2l0Y2ggdG8gVFNDLiBUaGlzIGlzIGFsc28gdG8gYXZvaWQgdGhlIHBvc3NpYmls aXR5IG9mCj4+Pj4gaGF2aW5nIGluY29uc2lzdGVudCByZWFkaW5ncyBpbiB0aGlzIHNob3J0IHBl cmlvZCAoaS5lLiB1bnRpbAo+Pj4+IGNhbGlicmF0aW9uIGZpcmVzKS4KPj4+Cj4+PiBBbmQgd2l0 aGluIHRoaXMgb25lIHNlY29uZCwgd2hpY2ggbWF5IGNvdmVyIHNvbWUgb2YgRG9tMCdzCj4+PiBi b290aW5nIHVwLCBpdCBpcyBva2F5IHRvIGhhdmUgaW5jb25zaXN0ZW5jaWVzPwo+PiBJdCdzIG5v dCBva2F5IHdoaWNoIGlzIHdoeSBJIGFtIHJlbW92aW5nIHRoaXMgcG9zc2liaWxpdHkgd2hlbiBz d2l0Y2hpbmcgdG8gVFNDLgo+PiBUaGUgaW5jb25zaXN0ZW5jaWVzIGluIHRob3NlIHJlYWRpbmdz IChpZiBJIHdhc24ndCBhZGp1c3RpbmcpIHdvdWxkIGJlIGJlY2F1c2UKPj4gd2Ugd291bGQgYmUg dXNpbmcgKGluIHRoYXQgMS1zZWMpIHRob3NlIGNwdSB0aW1lIHR1cGxlcyBjYWxjdWxhdGVkIGJ5 IHRoZQo+PiBwcmV2aW91cyBjYWxpYnJhdGlvbiBvciBwbGF0Zm9ybSB0aW1lIGluaXRpYWxpemF0 aW9uICh3aGlsZSBzdGlsbCB3YXMgSFBFVCwKPj4gQUNQSSwgZXRjIGFzIGNsb2Nrc291cmNlKS4g V291bGQgeW91IHByZWZlciBtZSByZW1vdmluZyB0aGUgImF2b2lkIiBhbmQgaW5zdGVhZAo+PiBj aGFuZ2UgaXQgdG8gInJlbW92ZSB0aGUgcG9zc2liaWxpdHkiIGluIHRoaXMgbGFzdCBzZW50ZW5j ZT8KPiAKPiBMZXQncyBub3QgZG8gdGhlIDJuZCBzdGVwIGJlZm9yZSB0aGUgMXN0LCB3aGljaCBp cyB0aGUgcXVlc3Rpb24gb2YKPiB3aGF0IGhhcHBlbnMgcHJpb3IgdG8gYW5kIHdoYXQgYWN0dWFs bHkgY2hhbmdlcyBhdCB0aGlzIGZpcnN0Cj4gY2FsaWJyYXRpb24gKGFmdGVyIDEgc2VjKS4KVGhl IGZpcnN0IGNhbGlicmF0aW9uIHdvbid0IGNoYW5nZSBtdWNoIC0gdGhpcyAxLXNlYyB3YXMgbWVh bnQgd2hlbiBoYXZpbmcKbm9wX3JlbmRlenZvdXMgd2hpY2ggaXMgdGhlIGZpcnN0IHRpbWUgcGxh dGZvcm0gdGltZXIgd291bGQgYmUgdXNlZCB0byBzZXQgbG9jYWwKY3B1X3RpbWUgKHdpbGwgYWRq dXN0IHRoZSBtZW50aW9uIGFib3ZlIGFzIGl0J3MgbWlzbGVhZGluZyBmb3IgdGhlIHJlYWRlciBh cyBpdApkb2Vzbid0IHJlZmVyIHRvIHRoaXMgcGF0Y2gpLiBUaG91Z2ggcmVzZWVkaW5nIHRoZSBj cHUgdGltZXMgdG8gYm9vdF90c2Nfc3RhbXAKcHJpb3IgdG8gY2FsaWJyYXRpb24gKCp3aXRob3V0 KiB0aGUgdGltZSBsYXRjaCB2YWx1ZXMgZnJvbSBwcmV2aW91cyBwbGF0Zm9ybQp0aW1lcikgd2Ug Y2FuIGVuc3VyZSBOT1cvZ2V0X3NfdGltZSBvciBjYWxscyB0byB1cGRhdGVfdmNwdV9zeXN0ZW1f dGltZSgpIHdpbGwKc2VlIG1vbm90b25pY2FsbHkgaW5jcmVhc2luZyB2YWx1ZXMuIE90aGVyd2lz ZSBrZWVwaW5nIHRoZSBwcmV2aW91cyBvbmVzLApjYWxpYnJhdGlvbiB3b3VsZCBqdXN0IGFkZCB1 cCBsb2NhbCBUU0MgZGVsdGEgYW5kIGFueSBleGlzdGluZyBkaXZlcmdlbmNlCndvdWxkbid0IGJl IHNvbHZlZC4gT24gYSBsYXRlciBwYXRjaCB3aGVuIHdlIHNldCB0aGUgc3RhYmxlIGJpdCAod2l0 aCBub3AKcmVuZGV6dm91cyksIGlmIHRoZXNlIGNwdSB0aW1lcyB3ZXJlbid0IGFkanVzdGVkIGd1 ZXN0cy94ZW4gd291bGQgc3RpbGwgc2VlCnNtYWxsIGRpdmVyZ2VuY2UgYmV0d2VlbiBDUFVzIHVu dGlsIHRoZSBmaXJzdCBjYWxpYnJhdGlvbiB3YXMgZmlyZWQgKGFmdGVyIHdlCnN3aXRjaGVkIHRv IFRTQykuIEFuZCB0aGVuIHRoZSB2YWx1ZXMgd291bGRuJ3QgYmUgY29uc2lzdGVudCB3aXRoIHRo ZSBndWFyYW50ZWVzCmV4cGVjdGVkIGZyb20gdGhpcyBiaXQuIEJ1dCBldmVuIG5vdCBjb25zaWRl cmluZyB0aGlzIGJpdCAod2hpY2ggaXMgbm90IHRoZQpzdWJqZWN0IG9mIHRoaXMgcGF0Y2gpLCBz YW1lIGd1YXJhbnRlZSBpcyBleHBlY3RlZCBmcm9tIGdldF9zX3RpbWUoKSBjYWxscwp3aXRoaW4g WGVuLgoKCj4+Pj4gQEAgLTE0ODAsNiArMTU3MCwyNSBAQCBzdGF0aWMgaW50IF9faW5pdCB2ZXJp ZnlfdHNjX3JlbGlhYmlsaXR5KHZvaWQpCj4+Pj4gICAgICAgICAgICAgIHByaW50aygiVFNDIHdh cnAgZGV0ZWN0ZWQsIGRpc2FibGluZyBUU0NfUkVMSUFCTEVcbiIpOwo+Pj4+ICAgICAgICAgICAg ICBzZXR1cF9jbGVhcl9jcHVfY2FwKFg4Nl9GRUFUVVJFX1RTQ19SRUxJQUJMRSk7Cj4+Pj4gICAg ICAgICAgfQo+Pj4+ICsgICAgICAgIGVsc2UgaWYgKCAhc3RyY21wKG9wdF9jbG9ja3NvdXJjZSwg InRzYyIpICYmCj4+Pj4gKyAgICAgICAgICAgICAgICAgICh0cnlfcGxhdGZvcm1fdGltZXIoJnBs dF90c2MpID4gMCkgKQo+Pj4+ICsgICAgICAgIHsKPj4+PiArICAgICAgICAgICAgLyoKPj4+PiAr ICAgICAgICAgICAgICogUGxhdGZvcm0gdGltZXIgaGFzIGNoYW5nZWQgYW5kIENQVSB0aW1lIHdp bGwgb25seSBiZSB1cGRhdGVkCj4+Pj4gKyAgICAgICAgICAgICAqIGFmdGVyIHdlIHNldCBhZ2Fp biB0aGUgY2FsaWJyYXRpb24gdGltZXIsIHdoaWNoIG1lYW5zIHdlIG5lZWQgdG8KPj4+PiArICAg ICAgICAgICAgICogc2VlZCBhZ2FpbiBlYWNoIGxvY2FsIENQVSB0aW1lLiBBdCB0aGlzIHN0YWdl IFRTQyBpcyBrbm93biB0byBiZQo+Pj4+ICsgICAgICAgICAgICAgKiByZWxpYWJsZSBpLmUuIG1v bm90b25pY2FsbHkgaW5jcmVhc2luZyBhY3Jvc3MgYWxsIENQVXMgc28gdGhpcwo+Pj4+ICsgICAg ICAgICAgICAgKiBsZXRzIHVzIHJlbW92ZSB0aGUgc2tldyBiZXR3ZWVuIHBsYXRmb3JtIHRpbWVy IGFuZCBUU0MsIHNpbmNlCj4+Pj4gKyAgICAgICAgICAgICAqIHRoZXNlIGFyZSBub3cgZWZmZWN0 aXZlbHkgdGhlIHNhbWUuCj4+Pj4gKyAgICAgICAgICAgICAqLwo+Pj4+ICsgICAgICAgICAgICBv bl9zZWxlY3RlZF9jcHVzKCZjcHVfb25saW5lX21hcCwgcmVzZXRfcGVyY3B1X3RpbWUsIE5VTEws IDEpOwo+Pj4+ICsKPj4+PiArICAgICAgICAgICAgLyogRmluaXNoIHBsYXRmb3JtIHRpbWVyIHN3 aXRjaC4gKi8KPj4+PiArICAgICAgICAgICAgdHJ5X3BsYXRmb3JtX3RpbWVyX3RhaWwoKTsKPj4+ PiArCj4+Pj4gKyAgICAgICAgICAgIHByaW50ayhYRU5MT0dfSU5GTyAiU3dpdGNoZWQgdG8gUGxh dGZvcm0gdGltZXIgJXMgVFNDXG4iLAo+Pj4+ICsgICAgICAgICAgICAgICAgICAgZnJlcV9zdHJp bmcocGx0X3NyYy5mcmVxdWVuY3kpKTsKPj4+Cj4+PiBUaGlzIG1lc3NhZ2Ugc2hvdWxkIGhhdmUg dGhlIHNhbWUgbG9nIGxldmVsIGFzIHRoZSBvbmUgYXQgdGhlIGVuZAo+Pj4gb2YgaW5pdF9wbGF0 Zm9ybV90aW1lcigpLgo+PiBBZ3JlZWQsIGJ1dCBhdCB0aGUgZW5kIG9mIGluaXRfcGxhdGZvcm1f dGltZXIgdGhlcmUgaXMgYSBwbGFpbiBwcmludGsgd2l0aCBhbgo+PiBvbWl0dGVkIGxvZyBsZXZl bC4gT3IgZG8geW91IG1lYW4gdG8gcmVtb3ZlIFhFTkxPR19JTkZPIGZyb20gdGhpcyBwcmludGsg YWJvdmUKPj4gb3IsIGluc3RlYWQgYWRkIFhFTkxPR19JTkZPIHRvIG9uZSBwcmludGsgYXQgdGhl IGVuZCBvZiAKPj4gaW5pdF9wbGF0Zm9ybV90aW1lcigpID8KPiAKPiBXZWxsLCBpbmZvIHdvdWxk IGFnYWluIGJlIHRvbyBsb3cgYSBsZXZlbCBmb3IgbXkgdGFzdGUuIEhlbmNlIGVpdGhlcgo+IHJl bW92ZSB0aGUgbGV2ZWwgaGVyZSAoc2xpZ2h0bHkgcHJlZmVycmVkIGZyb20gbXkgcG92KSwgb3Ig bWFrZSBib3RoCj4gd2FybmluZy4KQXMgeW91ciBwcmVmZXJlbmNlIGdvZXMgdG93YXJkcyB3aXRo b3V0IHRoZSBsb2cgbGV2ZWwsIEkgd2lsbCByZS1pbnRyb2R1Y2UgYmFjawp3aXRob3V0IGl0LiBB bHRob3VnaCBJIHdvdWxkIGZpbmQgY2xlYXJlciB0byB1c2UgcHJpbnRrIHdpdGggYSBsb2cgbGV2 ZWwgYXMgaXQKd2FzIGFkdmlzZWQgaW4gZWFybGllciByZXZpZXdzLgoKTkI6IE15IHN1Z2dlc3Rp b24gb2YgaW5mbyBhcyBsZXZlbCBpcyBiZWNhdXNlIG15IHVzdWFsIGxpbmUgb2YgdGhvdWdodCBp cyB0byBzZWUKd2FybmluZyBhcyBzb21ldGhpbmcgcG90ZW50aWFsbHkgZXJyb25lb3VzIHRoYXQg dXNlciBzaG91bGQgYmUgd2FybmVkIGFib3V0LCBhbmQKZXJyb3IgYXMgYmVpbmcgYW4gYWN0dWFs IGVycm9yLgoKSm9hbwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRw czovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==