From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Subject: Re: [PATCH i-g-t 1/3] benchmarks/gem_syslatency: Pass a
 write hazard around
Date: Tue, 22 May 2018 12:37:35 +0100
Message-ID: <6c8fb540-1cdc-52c8-1065-c81c97016f61@linux.intel.com>
References: <20180522110044.26439-1-chris@chris-wilson.co.uk>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
In-Reply-To: <20180522110044.26439-1-chris@chris-wilson.co.uk>
Content-Language: en-GB
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Cc: igt-dev@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

Ck9uIDIyLzA1LzIwMTggMTI6MDAsIENocmlzIFdpbHNvbiB3cm90ZToKPiBFeHRlbmQgdGhlIGk5
MTUgbG9hZCB0byAob3B0aW9uYWxseSkgcGFzcyBhIHdyaXRlIGhhemFyZCBiZXR3ZWVuCj4gZW5n
aW5lcywgY2F1c2luZyB1cyB0byB3YWl0IG9uIHRoZSBpbnRlcnJ1cHQgYmV0d2VlbiBlbmdpbmVz
LiBUaHVzCj4gYWRkaW5nIE1JX1VTRVJfSU5URVJSVVBUIGlycSBoYW5kbGluZyB0byBvdXIgbGlz
dCBvZiBzaW5zLgo+IAo+IFNpZ25lZC1vZmYtYnk6IENocmlzIFdpbHNvbiA8Y2hyaXNAY2hyaXMt
d2lsc29uLmNvLnVrPgo+IENjOiBUdnJ0a28gVXJzdWxpbiA8dHZydGtvLnVyc3VsaW5AaW50ZWwu
Y29tPgo+IC0tLQo+ICAgYmVuY2htYXJrcy9nZW1fc3lzbGF0ZW5jeS5jIHwgMjggKysrKysrKysr
KysrKysrKysrLS0tLS0tLS0tLQo+ICAgMSBmaWxlIGNoYW5nZWQsIDE4IGluc2VydGlvbnMoKyks
IDEwIGRlbGV0aW9ucygtKQo+IAo+IGRpZmYgLS1naXQgYS9iZW5jaG1hcmtzL2dlbV9zeXNsYXRl
bmN5LmMgYi9iZW5jaG1hcmtzL2dlbV9zeXNsYXRlbmN5LmMKPiBpbmRleCBkZTU5ZWFmODIuLjkx
NjBlMjE5OSAxMDA2NDQKPiAtLS0gYS9iZW5jaG1hcmtzL2dlbV9zeXNsYXRlbmN5LmMKPiArKysg
Yi9iZW5jaG1hcmtzL2dlbV9zeXNsYXRlbmN5LmMKPiBAQCAtNTMsNiArNTMsNyBAQCBzdHJ1Y3Qg
Z2VtX2J1c3lzcGluIHsKPiAgIAlwdGhyZWFkX3QgdGhyZWFkOwo+ICAgCXVuc2lnbmVkIGxvbmcg
Y291bnQ7Cj4gICAJYm9vbCBsZWFrOwo+ICsJYm9vbCBpbnRlcnJ1cHRzOwo+ICAgfTsKPiAgIAo+
ICAgc3RydWN0IHN5c193YWl0IHsKPiBAQCAtOTQsNyArOTUsNyBAQCBzdGF0aWMgdm9pZCAqZ2Vt
X2J1c3lzcGluKHZvaWQgKmFyZykKPiAgIAljb25zdCB1aW50MzJfdCBiYmUgPSBNSV9CQVRDSF9C
VUZGRVJfRU5EOwo+ICAgCXN0cnVjdCBnZW1fYnVzeXNwaW4gKmJzID0gYXJnOwo+ICAgCXN0cnVj
dCBkcm1faTkxNV9nZW1fZXhlY2J1ZmZlcjIgZXhlY2J1ZjsKPiAtCXN0cnVjdCBkcm1faTkxNV9n
ZW1fZXhlY19vYmplY3QyIG9iajsKPiArCXN0cnVjdCBkcm1faTkxNV9nZW1fZXhlY19vYmplY3Qy
IG9ialsyXTsKPiAgIAljb25zdCB1bnNpZ25lZCBzeiA9IGJzLT5sZWFrID8gMTYgPDwgMjAgOiA0
IDw8IDEwOwo+ICAgCXVuc2lnbmVkIGVuZ2luZXNbMTZdOwo+ICAgCXVuc2lnbmVkIG5lbmdpbmU7
Cj4gQEAgLTEwNywxMyArMTA4LDE1IEBAIHN0YXRpYyB2b2lkICpnZW1fYnVzeXNwaW4odm9pZCAq
YXJnKQo+ICAgCWZvcl9lYWNoX2VuZ2luZShmZCwgZW5naW5lKQo+ICAgCQlpZiAoIWlnbm9yZV9l
bmdpbmUoZmQsIGVuZ2luZSkpIGVuZ2luZXNbbmVuZ2luZSsrXSA9IGVuZ2luZTsKPiAgIAo+IC0J
bWVtc2V0KCZvYmosIDAsIHNpemVvZihvYmopKTsKPiAtCW9iai5oYW5kbGUgPSBnZW1fY3JlYXRl
KGZkLCBzeik7Cj4gLQlnZW1fd3JpdGUoZmQsIG9iai5oYW5kbGUsIDAsICZiYmUsIHNpemVvZihi
YmUpKTsKPiArCW1lbXNldChvYmosIDAsIHNpemVvZihvYmopKTsKPiArCW9ialswXS5oYW5kbGUg
PSBnZW1fY3JlYXRlKGZkLCA0MDk2KTsKPiArCW9ialswXS5mbGFncyA9IEVYRUNfT0JKRUNUX1dS
SVRFOwo+ICsJb2JqWzFdLmhhbmRsZSA9IGdlbV9jcmVhdGUoZmQsIHN6KTsKPiArCWdlbV93cml0
ZShmZCwgb2JqWzFdLmhhbmRsZSwgMCwgJmJiZSwgc2l6ZW9mKGJiZSkpOwo+ICAgCj4gICAJbWVt
c2V0KCZleGVjYnVmLCAwLCBzaXplb2YoZXhlY2J1ZikpOwo+IC0JZXhlY2J1Zi5idWZmZXJzX3B0
ciA9ICh1aW50cHRyX3QpJm9iajsKPiAtCWV4ZWNidWYuYnVmZmVyX2NvdW50ID0gMTsKPiArCWV4
ZWNidWYuYnVmZmVyc19wdHIgPSAodWludHB0cl90KShvYmogKyAhYnMtPmludGVycnVwdHMpOwo+
ICsJZXhlY2J1Zi5idWZmZXJfY291bnQgPSAxICsgISFicy0+aW50ZXJydXB0czsKCkFib3ZlIHR3
byBsaW5lcyBhcmUgdG8gaGFja3kuIDovIFN1Z2dlc3QgYSBtb3JlIHBlZGVzdHJpYW4gYXBwcm9h
Y2ggd2l0aCAKYSB0ZXJuYXJ5IG9yIHNvbWV0aGluZy4KCj4gICAJZXhlY2J1Zi5mbGFncyB8PSBM
T0NBTF9JOTE1X0VYRUNfSEFORExFX0xVVDsKPiAgIAlleGVjYnVmLmZsYWdzIHw9IExPQ0FMX0k5
MTVfRVhFQ19OT19SRUxPQzsKPiAgIAlpZiAoX19nZW1fZXhlY2J1ZihmZCwgJmV4ZWNidWYpKSB7
Cj4gQEAgLTEyOSw5ICsxMzIsOSBAQCBzdGF0aWMgdm9pZCAqZ2VtX2J1c3lzcGluKHZvaWQgKmFy
ZykKPiAgIAkJfQo+ICAgCQlicy0+Y291bnQgKz0gbmVuZ2luZTsKPiAgIAkJaWYgKGJzLT5sZWFr
KSB7Cj4gLQkJCWdlbV9tYWR2aXNlKGZkLCBvYmouaGFuZGxlLCBJOTE1X01BRFZfRE9OVE5FRUQp
Owo+IC0JCQlvYmouaGFuZGxlID0gZ2VtX2NyZWF0ZShmZCwgc3opOwo+IC0JCQlnZW1fd3JpdGUo
ZmQsIG9iai5oYW5kbGUsIDAsICZiYmUsIHNpemVvZihiYmUpKTsKPiArCQkJZ2VtX21hZHZpc2Uo
ZmQsIG9ialsxXS5oYW5kbGUsIEk5MTVfTUFEVl9ET05UTkVFRCk7Cj4gKwkJCW9ialsxXS5oYW5k
bGUgPSBnZW1fY3JlYXRlKGZkLCBzeik7Cj4gKwkJCWdlbV93cml0ZShmZCwgb2JqWzFdLmhhbmRs
ZSwgMCwgJmJiZSwgc2l6ZW9mKGJiZSkpOwo+ICAgCQl9Cj4gICAJfQo+ICAgCj4gQEAgLTMwNSwx
MyArMzA4LDE3IEBAIGludCBtYWluKGludCBhcmdjLCBjaGFyICoqYXJndikKPiAgIAlpbnQgZmll
bGQgPSAtMTsKPiAgIAlpbnQgZW5hYmxlX2dlbV9zeXNidXN5ID0gMTsKPiAgIAlib29sIGxlYWsg
PSBmYWxzZTsKPiArCWJvb2wgaW50ZXJydXB0cyA9IGZhbHNlOwo+ICAgCWludCBuLCBjOwo+ICAg
Cj4gLQl3aGlsZSAoKGMgPSBnZXRvcHQoYXJnYywgYXJndiwgInQ6ZjpibW4iKSkgIT0gLTEpIHsK
PiArCXdoaWxlICgoYyA9IGdldG9wdChhcmdjLCBhcmd2LCAidDpmOmJtbmkiKSkgIT0gLTEpIHsK
PiAgIAkJc3dpdGNoIChjKSB7Cj4gICAJCWNhc2UgJ24nOiAvKiBkcnkgcnVuLCBtZWFzdXJlIGJh
c2VsaW5lIHN5c3RlbSBsYXRlbmN5ICovCj4gICAJCQllbmFibGVfZ2VtX3N5c2J1c3kgPSAwOwo+
ICAgCQkJYnJlYWs7Cj4gKwkJY2FzZSAnaSc6IC8qIGludGVycnVwdHMgYWhveSEgKi8KPiArCQkJ
aW50ZXJydXB0cyA9IHRydWU7Cj4gKwkJCWJyZWFrOwo+ICAgCQljYXNlICd0JzoKPiAgIAkJCS8q
IEhvdyBsb25nIHRvIHJ1biB0aGUgYmVuY2htYXJrIGZvciAoc2Vjb25kcykgKi8KPiAgIAkJCXRp
bWUgPSBhdG9pKG9wdGFyZyk7Cj4gQEAgLTM0Niw2ICszNTMsNyBAQCBpbnQgbWFpbihpbnQgYXJn
YywgY2hhciAqKmFyZ3YpCj4gICAJCWZvciAobiA9IDA7IG4gPCBuY3B1czsgbisrKSB7Cj4gICAJ
CQliaW5kX2NwdSgmYXR0ciwgbik7Cj4gICAJCQlidXN5W25dLmxlYWsgPSBsZWFrOwo+ICsJCQli
dXN5W25dLmludGVycnVwdHMgPSBpbnRlcnJ1cHRzOwo+ICAgCQkJcHRocmVhZF9jcmVhdGUoJmJ1
c3lbbl0udGhyZWFkLCAmYXR0ciwKPiAgIAkJCQkgICAgICAgZ2VtX2J1c3lzcGluLCAmYnVzeVtu
XSk7Cj4gICAJCX0KPiAKCldpdGggdGhlIGhhY2tlcnkgZWxpbWluYXRlZDoKClJldmlld2VkLWJ5
OiBUdnJ0a28gVXJzdWxpbiA8dHZydGtvLnVyc3VsaW5AaW50ZWwuY29tPgoKUmVnYXJkcywKClR2
cnRrbwpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpJbnRl
bC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6
Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9pbnRlbC1nZngK