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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B5C50C4167B for ; Thu, 30 Nov 2023 12:27:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r8g7N-0006UV-Kx; Thu, 30 Nov 2023 07:26:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r8g7L-0006TL-JP; Thu, 30 Nov 2023 07:26:07 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r8g7G-0001AT-G5; Thu, 30 Nov 2023 07:26:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=KYs+w9tX5xQvYgwt77gAisciicGwhphGbHCAn2v/kV4=; b=ngZpcOH3dJpNLUOSKBwf1E2n+G 8QT3esymnfG8dUxodXc5C3c4YTVwZzZMlgZkhJ74gyplw+tNd0xiD0CjPUhovdcNWPjRKOelRjZ91 D99Hb2Iqlj6w/PHXzdUQ9JV3sPdpceIXzN9VQxczSF5Hvtq1jKnqRFMhO0hBViduj+EllH/NssRsS m9/5V6Wjl5VnqKyMxv/2GnU84wGU1K9D3y7RN6afL5iqLyLIv7v2kw02NoqByan5e1rPcveR+5Zv+ Y4JBehm66YoUXqZSHyllcNdBLYp+ztqcGsBaepLwOrOL39VzN9yHAB20GDI0XZw7WmUcYTUsQJtUw XeyZyyvQ==; Received: from [2001:8b0:10b:5:743c:af97:a7e4:d38e] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r8g6u-00EQu0-JO; Thu, 30 Nov 2023 12:25:40 +0000 Message-ID: <84cf6f6cfa498491eb37599f1f992aefafaa46d1.camel@infradead.org> Subject: Re: [PATCH 1/6] system/cpus: rename qemu_mutex_lock_iothread() to qemu_bql_lock() From: David Woodhouse To: Stefan Hajnoczi , qemu-devel@nongnu.org Cc: Jean-Christophe Dubois , Fabiano Rosas , qemu-s390x@nongnu.org, Song Gao , Marcel Apfelbaum , Thomas Huth , Hyman Huang , Marcelo Tosatti , Andrey Smirnov , Peter Maydell , Kevin Wolf , Ilya Leoshkevich , Artyom Tarasenko , Mark Cave-Ayland , Max Filippov , Alistair Francis , Paul Durrant , Jagannathan Raman , Juan Quintela , "Daniel P." =?ISO-8859-1?Q?Berrang=E9?= , qemu-arm@nongnu.org, Jason Wang , Gerd Hoffmann , Hanna Reitz , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , BALATON Zoltan , Daniel Henrique Barboza , Elena Ufimtseva , Aurelien Jarno , Hailiang Zhang , Roman Bolshakov , Huacai Chen , Fam Zheng , Eric Blake , Jiri Slaby , Alexander Graf , Liu Zhiwei , Weiwei Li , Eric Farman , Stafford Horne , David Hildenbrand , Markus Armbruster , Reinoud Zandijk , Palmer Dabbelt , Cameron Esfahani , xen-devel@lists.xenproject.org, Pavel Dovgalyuk , qemu-riscv@nongnu.org, Aleksandar Rikalo , John Snow , Sunil Muthuswamy , Michael Roth , David Gibson , "Michael S. Tsirkin" , Richard Henderson , Bin Meng , Stefano Stabellini , kvm@vger.kernel.org, qemu-block@nongnu.org, Halil Pasic , Peter Xu , Anthony Perard , Harsh Prateek Bora , Alex =?ISO-8859-1?Q?Benn=E9e?= , Eduardo Habkost , Paolo Bonzini , Vladimir Sementsov-Ogievskiy , =?ISO-8859-1?Q?C=E9dric?= Le Goater , qemu-ppc@nongnu.org, Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Christian Borntraeger , Akihiko Odaki , Leonardo Bras , Nicholas Piggin , Jiaxun Yang Date: Thu, 30 Nov 2023 12:25:38 +0000 In-Reply-To: <20231129212625.1051502-2-stefanha@redhat.com> References: <20231129212625.1051502-1-stefanha@redhat.com> <20231129212625.1051502-2-stefanha@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-eME1UhoVVowc+xoRrBDG" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+bcb5a996c0d123d1f7ff+7403+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-eME1UhoVVowc+xoRrBDG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-11-29 at 16:26 -0500, Stefan Hajnoczi wrote: > The Big QEMU Lock (BQL) has many names and they are confusing. The > actual QemuMutex variable is called qemu_global_mutex but it's commonly > referred to as the BQL in discussions and some code comments. The > locking APIs, however, are called qemu_mutex_lock_iothread() and > qemu_mutex_unlock_iothread(). >=20 > The "iothread" name is historic and comes from when the main thread was > split into into KVM vcpu threads and the "iothread" (now called the main > loop thread). I have contributed to the confusion myself by introducing > a separate --object iothread, a separate concept unrelated to the BQL. >=20 > The "iothread" name is no longer appropriate for the BQL. Rename the > locking APIs to: > - void qemu_bql_lock(void) > - void qemu_bql_unlock(void) > - bool qemu_bql_locked(void) >=20 > There are more APIs with "iothread" in their names. Subsequent patches > will rename them. There are also comments and documentation that will be > updated in later patches. >=20 > Signed-off-by: Stefan Hajnoczi Acked-by: David Woodhouse --=-eME1UhoVVowc+xoRrBDG Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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