From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5076FC3A5A6 for ; Thu, 19 Sep 2019 15:56:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1D4C1208C0 for ; Thu, 19 Sep 2019 15:56:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JIK5c/6H"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="S6pbH9hT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1D4C1208C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:References:Message-Id:Date: In-Reply-To:From:Subject:Mime-Version:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XQo9qOIP6DXuLZBiUsvmVPdjoi3WgAIFzIXMpv+ZnCI=; b=JIK5c/6HQXM6oY vdRrH7RMUmmCR13DYSp1jAAbFZcm3rutU4vo72Wiws0GxTCIqpss4mDoWieIQN2Cv3TOO4aJ83/Hf hBKRVQr0e8wr7obV6X/nX+7Lvd7E1m0BM0O9vsB5+JwkD65QXhIJ4106nNVRK3+DLpXkqk9QtYP0x GQ+jjDgrBqK28ovGq+BqWd38FfHDwvk2BerDbUGlP78iPs+QBFOuU0FEKqR9ZVKxQyHdlNS3n4JRp Cpy6YmcA8n+reTJK+PvNc1vWdaiPyAU8ud+PDJLf6r53ahZpm9BTAV0Fo1UV8kpizBKOC7++Gw7M8 NrPsGA8r/3cbYzM+3r/A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iAynC-0000Tm-JD; Thu, 19 Sep 2019 15:56:26 +0000 Received: from aserp2120.oracle.com ([141.146.126.78]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iAyn8-0000TB-R2 for linux-arm-kernel@lists.infradead.org; Thu, 19 Sep 2019 15:56:24 +0000 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8JFsSrQ133684; Thu, 19 Sep 2019 15:55:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2019-08-05; bh=sriX7NN5BqHD0GlF4Xbuu366jfCsxHPqzJ2QnT7Ovus=; b=S6pbH9hTSxhfomU3TV/MckQLOUPdlCJwvNRI6Fu6RgTl7g09tUKygAhAaFdzzISp/bHd Z7+lAivQO8/FFGqtqpSYiJA6Pf740MYUvPY/EesxutP/gf0zWlbfjjbsjhYTTxckMKLA ZW+G6ZXPnLI9RBKlBF0Jvl4keSGN9RyFX1VjQsBR3q8p2oshbIfooj58706ydhuuEVkm QEQnDzimw+QAHbno70KOmXkMbTTGJPBTnZA4Zyjvv1p9qhwGSNGw2NQvEaDumfCUSAXj 7VHRdev+w9in4qmvzblANfgNF8tOJs8uAde4zc8O3o+6L+o9liPcNOoqGfbJHg8H2vyI VQ== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 2v3vb4n06e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 19 Sep 2019 15:55:31 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8JFsCYG126243; Thu, 19 Sep 2019 15:55:30 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 2v3vbaqfqu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 19 Sep 2019 15:55:30 +0000 Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x8JFtL16021238; Thu, 19 Sep 2019 15:55:21 GMT Received: from [10.11.111.157] (/10.11.111.157) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 19 Sep 2019 08:55:20 -0700 Mime-Version: 1.0 (Mac OS X Mail 10.2 \(3259\)) Subject: Re: [PATCH v4 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock From: Alex Kogan In-Reply-To: <3ae2b6a2-ffe6-2ca1-e5bf-2292db50e26f@redhat.com> Date: Thu, 19 Sep 2019 11:55:21 -0400 Message-Id: <87B87982-670F-4F12-9EE0-DC89A059FAEC@oracle.com> References: <20190906142541.34061-1-alex.kogan@oracle.com> <20190906142541.34061-4-alex.kogan@oracle.com> <3ae2b6a2-ffe6-2ca1-e5bf-2292db50e26f@redhat.com> To: Waiman Long X-Mailer: Apple Mail (2.3259) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9385 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190145 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9385 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190145 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190919_085622_966708_0EF2E3AB X-CRM114-Status: GOOD ( 19.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, guohanjun@huawei.com, arnd@arndb.de, peterz@infradead.org, dave.dice@oracle.com, jglauber@marvell.com, x86@kernel.org, will.deacon@arm.com, linux@armlinux.org.uk, linux-kernel@vger.kernel.org, rahul.x.yadav@oracle.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, steven.sistare@oracle.com, tglx@linutronix.de, daniel.m.jordan@oracle.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Pj4gKy8qCj4+ICsgKiBjbmFfdHJ5X2ZpbmRfbmV4dCAtIHNjYW4gdGhlIG1haW4gd2FpdGluZyBx dWV1ZSBsb29raW5nIGZvciB0aGUgZmlyc3QKPj4gKyAqIHRocmVhZCBydW5uaW5nIG9uIHRoZSBz YW1lIE5VTUEgbm9kZSBhcyB0aGUgbG9jayBob2xkZXIuIElmIGZvdW5kIChjYWxsIGl0Cj4+ICsg KiB0aHJlYWQgVCksIG1vdmUgYWxsIHRocmVhZHMgaW4gdGhlIG1haW4gcXVldWUgYmV0d2VlbiB0 aGUgbG9jayBob2xkZXIgYW5kCj4+ICsgKiBUIHRvIHRoZSBlbmQgb2YgdGhlIHNlY29uZGFyeSBx dWV1ZSBhbmQgcmV0dXJuIFQ7IG90aGVyd2lzZSwgcmV0dXJuIE5VTEwuCj4+ICsgKgo+PiArICog U2NoZW1hdGljYWxseSwgdGhpcyBtYXkgbG9vayBsaWtlIHRoZSBmb2xsb3dpbmcgKG5uIHN0YW5k cyBmb3IgbnVtYV9ub2RlIGFuZAo+PiArICogZXQgc3RhbmRzIGZvciBlbmNvZGVkX3RhaWwpLgo+ PiArICoKPj4gKyAqICAgICB3aGVuIGNuYV90cnlfZmluZF9uZXh0KCkgaXMgY2FsbGVkICh0aGUg c2Vjb25kYXJ5IHF1ZXVlIGlzIGVtcHR5KToKPj4gKyAqCj4+ICsgKiAgQSstLS0tLS0tLS0tLS0r ICAgQistLS0tLS0tLSsgICBDKy0tLS0tLS0tKyAgIFQrLS0tLS0tLS0rCj4+ICsgKiAgIHxtY3M6 bmV4dCAgICB8IC0+IHxtY3M6bmV4dHwgLT4gfG1jczpuZXh0fCAtPiB8bWNzOm5leHR8IC0+IE5V TEwKPj4gKyAqICAgfG1jczpsb2NrZWQ9MXwgICAgfGNuYTpubj0wfCAgICB8Y25hOm5uPTJ8ICAg IHxjbmE6bm49MXwKPj4gKyAqICAgfGNuYTpubj0xICAgIHwgICAgKy0tLS0tLS0tKyAgICArLS0t LS0tLS0rICAgICstLS0tLS0tLSsKPj4gKyAqICAgKy0tLS0tLS0tLS0tICsKPj4gKyAqCj4+ICsg KiAgICAgd2hlbiBjbmFfdHJ5X2ZpbmRfbmV4dCgpIHJldHVybnMgKHRoZSBzZWNvbmRhcnkgcXVl dWUgY29udGFpbnMgQiBhbmQgQyk6Cj4+ICsgKgo+PiArICogIEErLS0tLS0tLS0tLS0tLS0tLSsg ICAgVCstLS0tLS0tLSsKPj4gKyAqICAgfG1jczpuZXh0ICAgICAgICB8IC0+ICB8bWNzOm5leHR8 IC0+IE5VTEwKPj4gKyAqICAgfG1jczpsb2NrZWQ9Qi5ldCB8IC0rICB8Y25hOm5uPTF8Cj4+ICsg KiAgIHxjbmE6bm49MSAgICAgICAgfCAgfCAgKy0tLS0tLS0tKwo+PiArICogICArLS0tLS0tLS0t LS0tLS0tICsgIHwKPj4gKyAqICAgICAgICAgICAgICAgICAgICAgICB8Cj4+ICsgKiAgICAgICAg ICAgICAgICAgICAgICAgKy0+ICBCKy0tLS0tLS0tKyAgIEMrLS0tLS0tLS0rCj4+ICsgKiAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgfG1jczpuZXh0fCAtPiB8bWNzOm5leHR8Cj4+ICsgKiAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgfGNuYTpubj0wfCAgICB8Y25hOm5uPTJ8Cj4+ICsg KiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgfGNuYTp0YWlsfCAtPiArLS0tLS0tLS0rCj4+ ICsgKiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgKy0tLS0tLS0tKwo+PiArICoKPj4gKyAq IFRoZSB3b3JzdCBjYXNlIGNvbXBsZXhpdHkgb2YgdGhlIHNjYW4gaXMgTyhuKSwgd2hlcmUgbiBp cyB0aGUgbnVtYmVyCj4+ICsgKiBvZiBjdXJyZW50IHdhaXRlcnMuIEhvd2V2ZXIsIHRoZSBmYXN0 IHBhdGgsIHdoaWNoIGlzIGV4cGVjdGVkIHRvIGJlIHRoZQo+PiArICogY29tbW9uIGNhc2UsIGlz IE8oMSkuCj4+ICsgKi8KPj4gK3N0YXRpYyBzdHJ1Y3QgbWNzX3NwaW5sb2NrICpjbmFfdHJ5X2Zp bmRfbmV4dChzdHJ1Y3QgbWNzX3NwaW5sb2NrICpub2RlLAo+PiArCQkJCQkgICAgICBzdHJ1Y3Qg bWNzX3NwaW5sb2NrICpuZXh0KQo+PiArewo+PiArCXN0cnVjdCBjbmFfbm9kZSAqY24gPSAoc3Ry dWN0IGNuYV9ub2RlICopbm9kZTsKPj4gKwlzdHJ1Y3QgY25hX25vZGUgKmNuaSA9IChzdHJ1Y3Qg Y25hX25vZGUgKiluZXh0Owo+PiArCXN0cnVjdCBjbmFfbm9kZSAqZmlyc3QsICpsYXN0ID0gTlVM TDsKPj4gKwlpbnQgbXlfbnVtYV9ub2RlID0gY24tPm51bWFfbm9kZTsKPj4gKwo+PiArCS8qIGZh c3QgcGF0aDogaW1tZWRpYXRlIHN1Y2Nlc3NvciBpcyBvbiB0aGUgc2FtZSBOVU1BIG5vZGUgKi8K Pj4gKwlpZiAoY25pLT5udW1hX25vZGUgPT0gbXlfbnVtYV9ub2RlKQo+PiArCQlyZXR1cm4gbmV4 dDsKPj4gKwo+PiArCS8qIGZpbmQgYW55IG5leHQgd2FpdGVyIG9uICdvdXInIE5VTUEgbm9kZSAq Lwo+PiArCWZvciAoZmlyc3QgPSBjbmk7Cj4+ICsJICAgICBjbmkgJiYgY25pLT5udW1hX25vZGUg IT0gbXlfbnVtYV9ub2RlOwo+PiArCSAgICAgbGFzdCA9IGNuaSwgY25pID0gKHN0cnVjdCBjbmFf bm9kZSAqKVJFQURfT05DRShjbmktPm1jcy5uZXh0KSkKPj4gKwkJOwo+PiArCj4+ICsJLyogaWYg Zm91bmQsIHNwbGljZSBhbnkgc2tpcHBlZCB3YWl0ZXJzIG9udG8gdGhlIHNlY29uZGFyeSBxdWV1 ZSAqLwo+PiArCWlmIChjbmkgJiYgbGFzdCkKPj4gKwkJY25hX3NwbGljZV90YWlsKGNuLCBmaXJz dCwgbGFzdCk7Cj4+ICsKPj4gKwlyZXR1cm4gKHN0cnVjdCBtY3Nfc3BpbmxvY2sgKiljbmk7Cj4+ ICt9Cj4gCj4gQXQgdGhlIExpbnV4IFBsdW1iZXJzIENvbmZlcmVuY2UgbGFzdCB3ZWVrLCBXaWxs IGhhcyByYWlzZWQgdGhlIGNvbmNlcm4KPiBhYm91dCB0aGUgbGF0ZW5jeSBvZiB0aGUgTygxKSBj bmFfdHJ5X2ZpbmRfbmV4dCgpIG9wZXJhdGlvbiB0aGF0IHdpbGwKPiBhZGQgdG8gdGhlIGxvY2sg aG9sZCB0aW1lLgpXaGlsZSB0aGUgd29yc3QgY2FzZSBjb21wbGV4aXR5IG9mIHRoZSBzY2FuIGlz IE8obiksIEkgX3RoaW5rIGl0IGNhbiBiZSBwcm92ZW4KdGhhdCB0aGUgYW1vcnRpemVkIGNvbXBs ZXhpdHkgaXMgTygxKS4gRm9yIGludHVpdGlvbiwgY29uc2lkZXIgYSB0d28tbm9kZSAKc3lzdGVt IHdpdGggTiB0aHJlYWRzIHRvdGFsLiBJbiB0aGUgd29yc3QgY2FzZSBzY2VuYXJpbywgdGhlIHNj YW4gd2lsbCBnbyAKb3ZlciBOLzIgdGhyZWFkcyBydW5uaW5nIG9uIGEgZGlmZmVyZW50IG5vZGUu IElmIHRoZSBzY2FuIHVsdGltYXRlbHkg4oCcZmFpbHPigJ0KKG5vIHRocmVhZCBmcm9tIHRoZSBs b2NrIGhvbGRlcuKAmXMgbm9kZSBpcyBmb3VuZCksIHRoZSBsb2NrIHdpbGwgYmUgcGFzc2VkCnRv IHRoZSBmaXJzdCB0aHJlYWQgZnJvbSBhIGRpZmZlcmVudCBub2RlIGFuZCB0aGVuIGJldHdlZW4g YWxsIHRob3NlIE4vMiB0aHJlYWRzLAp3aXRoIGEgc2NhbiBvZiBqdXN0IG9uZSBub2RlIGZvciB0 aGUgbmV4dCBOLzIgLSAxIHBhc3Nlcy4gT3RoZXJ3aXNlLCB0aG9zZSAKTi8yIHRocmVhZHMgd2ls bCBiZSBtb3ZlZCB0byB0aGUgc2Vjb25kYXJ5IHF1ZXVlLiBPbiB0aGUgbmV4dCBsb2NrIGhhbmRv dmVyLCAKd2UgcGFzcyB0aGUgbG9jayBlaXRoZXIgdG8gdGhlIG5leHQgdGhyZWFkIGluIHRoZSBt YWluIHF1ZXVlIChhcyBpdCBoYXMgdG8gYmUgCmZyb20gb3VyIG5vZGUpIG9yIHRvIHRoZSBmaXJz dCBub2RlIGluIHRoZSBzZWNvbmRhcnkgcXVldWUuIEluIGJvdGggY2FzZXMsIHdlIApzY2FuIGp1 c3Qgb25lIG5vZGUsIGFuZCBpbiB0aGUgbGF0dGVyIGNhc2UsIHdlIGhhdmUgYWdhaW4gTi8yIC0g MSBwYXNzZXMgd2l0aCAKYSBzY2FuIG9mIGp1c3Qgb25lIG5vZGUgZWFjaC4KCj4gT25lIHdheSB0 byBoaWRlIHNvbWUgb2YgdGhlIGxhdGVuY3kgaXMgdG8gZG8KPiBhIHByZS1zY2FuIGJlZm9yZSBh Y3F1aXJpbmcgdGhlIGxvY2suIFRoZSBDTkEgY29kZSBjb3VsZCBvdmVycmlkZSB0aGUKPiBwdl93 YWl0X2hlYWRfb3JfbG9jaygpIGZ1bmN0aW9uIHRvIGNhbGwgY25hX3RyeV9maW5kX25leHQoKSBh cyBhCj4gcHJlLXNjYW4gYW5kIHJldHVybiAwLiBXaGF0IGRvIHlvdSB0aGluaz8KVGhpcyBpcyBj ZXJ0YWlubHkgcG9zc2libGUsIGJ1dCBJIGRvIG5vdCB0aGluayBpdCB3b3VsZCBjb21wbGV0ZWx5 IGVsaW1pbmF0ZSAKdGhlIHdvcnN0IGNhc2Ugc2NlbmFyaW8uIEl0IHdpbGwgcHJvYmFibHkgbWFr ZSBpdCBldmVuIGxlc3MgbGlrZWx5LCBidXQgYXQgCnRoZSBzYW1lIHRpbWUsIHdlIHdpbGwgcmVk dWNlIHRoZSBjaGFuY2Ugb2YgYWN0dWFsbHkgZmluZGluZyBhIHRocmVhZCBmcm9tIHRoZQpzYW1l IG5vZGUgKHRoYXQgbWF5IGVudGVyIHRoZSBtYWluIHF1ZXVlIHdoaWxlIHdlIHdhaXQgZm9yIHRo ZSBvd25lciAmIHBlbmRpbmcgCnRvIGdvIGF3YXkpLgoKUmVnYXJkcywK4oCUIEFsZXgKX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5l bCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6 Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=