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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 78CC8C4360F for ; Wed, 3 Apr 2019 16:33:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2767A2084B for ; Wed, 3 Apr 2019 16:33:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726791AbfDCQdY convert rfc822-to-8bit (ORCPT ); Wed, 3 Apr 2019 12:33:24 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48668 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726074AbfDCQdX (ORCPT ); Wed, 3 Apr 2019 12:33:23 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8EEBB5946B; Wed, 3 Apr 2019 16:33:22 +0000 (UTC) Received: from llong.remote.csb (dhcp-17-19.bos.redhat.com [10.18.17.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8CCDC6012C; Wed, 3 Apr 2019 16:33:20 +0000 (UTC) Subject: Re: [PATCH v2 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock To: Peter Zijlstra Cc: Alex Kogan , linux@armlinux.org.uk, mingo@redhat.com, will.deacon@arm.com, arnd@arndb.de, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, bp@alien8.de, hpa@zytor.com, x86@kernel.org, steven.sistare@oracle.com, daniel.m.jordan@oracle.com, dave.dice@oracle.com, rahul.x.yadav@oracle.com References: <20190329152006.110370-1-alex.kogan@oracle.com> <20190329152006.110370-4-alex.kogan@oracle.com> <60a3a2d8-d222-73aa-2df1-64c9d3fa3241@redhat.com> <20190402094320.GM11158@hirez.programming.kicks-ass.net> From: Waiman Long Openpgp: preference=signencrypt Autocrypt: addr=longman@redhat.com; prefer-encrypt=mutual; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190402094320.GM11158@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 03 Apr 2019 16:33:22 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/02/2019 05:43 AM, Peter Zijlstra wrote: > On Mon, Apr 01, 2019 at 10:36:19AM -0400, Waiman Long wrote: >> On 03/29/2019 11:20 AM, Alex Kogan wrote: >>> +config NUMA_AWARE_SPINLOCKS >>> + bool "Numa-aware spinlocks" >>> + depends on NUMA >>> + default y >>> + help >>> + Introduce NUMA (Non Uniform Memory Access) awareness into >>> + the slow path of spinlocks. >>> + >>> + The kernel will try to keep the lock on the same node, >>> + thus reducing the number of remote cache misses, while >>> + trading some of the short term fairness for better performance. >>> + >>> + Say N if you want absolute first come first serve fairness. >>> + >> The patch that I am looking for is to have a separate >> numa_queued_spinlock_slowpath() that coexists with >> native_queued_spinlock_slowpath() and >> paravirt_queued_spinlock_slowpath(). At boot time, we select the most >> appropriate one for the system at hand. > Agreed; and until we have static_call, I think we can abuse the paravirt > stuff for this. I haven't checked Josh's patch to see if it is doing. The availability of static_call will certainly make thing easier for this case. > By the time we patch the paravirt stuff: > > check_bugs() > alternative_instructions() > apply_paravirt() > > we should already have enumerated the NODE topology and so nr_node_ids() > should be set. > > So if we frob pv_ops.lock.queued_spin_lock_slowpath to > numa_queued_spin_lock_slowpath before that, it should all get patched > just right. > > That of course means the whole NUMA_AWARE_SPINLOCKS thing depends on > PARAVIRT_SPINLOCK, which is a bit awkward... Yes, this is one way of doing it. Another way to use static key to switch between the native and numa version. So if PARAVIRT_SPINLOCK is defined, we use the paravirt patching to point to the right function. If PARAVIRT_SPINLOCK isn't enabled, we can do something like static inline void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val) {         if (static_branch_unlikely(&use_numa_spinlock))                 numa_queued_spin_lock_slowpath(lock, val);         else                    native_queued_spin_lock_slowpath(lock, val); } Alternatively, we can also call numa_queued_spin_lock_slowpath() in native_queued_spin_lock_slowpath() if we don't want to increase the code size of spinlock call sites. Cheers, Longman 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=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 509EDC4360F for ; Wed, 3 Apr 2019 16:33:33 +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 E674C206BA for ; Wed, 3 Apr 2019 16:33:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="duFL0zSu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E674C206BA Authentication-Results: mail.kernel.org; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190402094320.GM11158@hirez.programming.kicks-ass.net> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 03 Apr 2019 16:33:22 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190403_093323_277386_8E2AA8F0 X-CRM114-Status: GOOD ( 21.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, arnd@arndb.de, dave.dice@oracle.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, Alex Kogan , 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 T24gMDQvMDIvMjAxOSAwNTo0MyBBTSwgUGV0ZXIgWmlqbHN0cmEgd3JvdGU6Cj4gT24gTW9uLCBB cHIgMDEsIDIwMTkgYXQgMTA6MzY6MTlBTSAtMDQwMCwgV2FpbWFuIExvbmcgd3JvdGU6Cj4+IE9u IDAzLzI5LzIwMTkgMTE6MjAgQU0sIEFsZXggS29nYW4gd3JvdGU6Cj4+PiArY29uZmlnIE5VTUFf QVdBUkVfU1BJTkxPQ0tTCj4+PiArCWJvb2wgIk51bWEtYXdhcmUgc3BpbmxvY2tzIgo+Pj4gKwlk ZXBlbmRzIG9uIE5VTUEKPj4+ICsJZGVmYXVsdCB5Cj4+PiArCWhlbHAKPj4+ICsJICBJbnRyb2R1 Y2UgTlVNQSAoTm9uIFVuaWZvcm0gTWVtb3J5IEFjY2VzcykgYXdhcmVuZXNzIGludG8KPj4+ICsJ ICB0aGUgc2xvdyBwYXRoIG9mIHNwaW5sb2Nrcy4KPj4+ICsKPj4+ICsJICBUaGUga2VybmVsIHdp bGwgdHJ5IHRvIGtlZXAgdGhlIGxvY2sgb24gdGhlIHNhbWUgbm9kZSwKPj4+ICsJICB0aHVzIHJl ZHVjaW5nIHRoZSBudW1iZXIgb2YgcmVtb3RlIGNhY2hlIG1pc3Nlcywgd2hpbGUKPj4+ICsJICB0 cmFkaW5nIHNvbWUgb2YgdGhlIHNob3J0IHRlcm0gZmFpcm5lc3MgZm9yIGJldHRlciBwZXJmb3Jt YW5jZS4KPj4+ICsKPj4+ICsJICBTYXkgTiBpZiB5b3Ugd2FudCBhYnNvbHV0ZSBmaXJzdCBjb21l IGZpcnN0IHNlcnZlIGZhaXJuZXNzLgo+Pj4gKwo+PiBUaGUgcGF0Y2ggdGhhdCBJIGFtIGxvb2tp bmcgZm9yIGlzIHRvIGhhdmUgYSBzZXBhcmF0ZQo+PiBudW1hX3F1ZXVlZF9zcGlubG9ja19zbG93 cGF0aCgpIHRoYXQgY29leGlzdHMgd2l0aAo+PiBuYXRpdmVfcXVldWVkX3NwaW5sb2NrX3Nsb3dw YXRoKCkgYW5kCj4+IHBhcmF2aXJ0X3F1ZXVlZF9zcGlubG9ja19zbG93cGF0aCgpLiBBdCBib290 IHRpbWUsIHdlIHNlbGVjdCB0aGUgbW9zdAo+PiBhcHByb3ByaWF0ZSBvbmUgZm9yIHRoZSBzeXN0 ZW0gYXQgaGFuZC4KPiBBZ3JlZWQ7IGFuZCB1bnRpbCB3ZSBoYXZlIHN0YXRpY19jYWxsLCBJIHRo aW5rIHdlIGNhbiBhYnVzZSB0aGUgcGFyYXZpcnQKPiBzdHVmZiBmb3IgdGhpcy4KCkkgaGF2ZW4n dCBjaGVja2VkIEpvc2gncyBwYXRjaCB0byBzZWUgaWYgaXQgaXMgZG9pbmcuIFRoZSBhdmFpbGFi aWxpdHkKb2Ygc3RhdGljX2NhbGwgd2lsbCBjZXJ0YWlubHkgbWFrZSB0aGluZyBlYXNpZXIgZm9y IHRoaXMgY2FzZS4KCj4gQnkgdGhlIHRpbWUgd2UgcGF0Y2ggdGhlIHBhcmF2aXJ0IHN0dWZmOgo+ Cj4gICBjaGVja19idWdzKCkKPiAgICAgYWx0ZXJuYXRpdmVfaW5zdHJ1Y3Rpb25zKCkKPiAgICAg ICBhcHBseV9wYXJhdmlydCgpCj4KPiB3ZSBzaG91bGQgYWxyZWFkeSBoYXZlIGVudW1lcmF0ZWQg dGhlIE5PREUgdG9wb2xvZ3kgYW5kIHNvIG5yX25vZGVfaWRzKCkKPiBzaG91bGQgYmUgc2V0Lgo+ Cj4gU28gaWYgd2UgZnJvYiBwdl9vcHMubG9jay5xdWV1ZWRfc3Bpbl9sb2NrX3Nsb3dwYXRoIHRv Cj4gbnVtYV9xdWV1ZWRfc3Bpbl9sb2NrX3Nsb3dwYXRoIGJlZm9yZSB0aGF0LCBpdCBzaG91bGQg YWxsIGdldCBwYXRjaGVkCj4ganVzdCByaWdodC4KPgo+IFRoYXQgb2YgY291cnNlIG1lYW5zIHRo ZSB3aG9sZSBOVU1BX0FXQVJFX1NQSU5MT0NLUyB0aGluZyBkZXBlbmRzIG9uCj4gUEFSQVZJUlRf U1BJTkxPQ0ssIHdoaWNoIGlzIGEgYml0IGF3a3dhcmQuLi4KClllcywgdGhpcyBpcyBvbmUgd2F5 IG9mIGRvaW5nIGl0LiBBbm90aGVyIHdheSB0byB1c2Ugc3RhdGljIGtleSB0bwpzd2l0Y2ggYmV0 d2VlbiB0aGUgbmF0aXZlIGFuZCBudW1hIHZlcnNpb24uIFNvIGlmIFBBUkFWSVJUX1NQSU5MT0NL IGlzCmRlZmluZWQsIHdlIHVzZSB0aGUgcGFyYXZpcnQgcGF0Y2hpbmcgdG8gcG9pbnQgdG8gdGhl IHJpZ2h0IGZ1bmN0aW9uLiBJZgpQQVJBVklSVF9TUElOTE9DSyBpc24ndCBlbmFibGVkLCB3ZSBj YW4gZG8gc29tZXRoaW5nIGxpa2UKCnN0YXRpYyBpbmxpbmUgdm9pZCBxdWV1ZWRfc3Bpbl9sb2Nr X3Nsb3dwYXRoKHN0cnVjdCBxc3BpbmxvY2sgKmxvY2ssIHUzMgp2YWwpCnsKwqDCoMKgwqDCoMKg wqAgaWYgKHN0YXRpY19icmFuY2hfdW5saWtlbHkoJnVzZV9udW1hX3NwaW5sb2NrKSkKwqDCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIG51bWFfcXVldWVkX3NwaW5fbG9ja19zbG93cGF0aChs b2NrLCB2YWwpOwrCoMKgwqDCoMKgwqDCoCBlbHNlwqDCoMKgCsKgwqDCoMKgwqDCoMKgwqDCoMKg wqDCoMKgwqDCoCBuYXRpdmVfcXVldWVkX3NwaW5fbG9ja19zbG93cGF0aChsb2NrLCB2YWwpOwp9 CgpBbHRlcm5hdGl2ZWx5LCB3ZSBjYW4gYWxzbyBjYWxsIG51bWFfcXVldWVkX3NwaW5fbG9ja19z bG93cGF0aCgpIGluCm5hdGl2ZV9xdWV1ZWRfc3Bpbl9sb2NrX3Nsb3dwYXRoKCkgaWYgd2UgZG9u J3Qgd2FudCB0byBpbmNyZWFzZSB0aGUgY29kZQpzaXplIG9mIHNwaW5sb2NrIGNhbGwgc2l0ZXMu CgpDaGVlcnMsCkxvbmdtYW4KCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5l bEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4v bGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=