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Sat, 2 Feb 2019 01:43:20 +0000 From: Paul Burton To: "linux-mips@vger.kernel.org" CC: Paul Burton Subject: [PATCH 04/14] MIPS: mm: Avoid HTW stop/start when dropping an inactive mm Thread-Topic: [PATCH 04/14] MIPS: mm: Avoid HTW stop/start when dropping an inactive mm Thread-Index: AQHUupisV3Jm+Q5KfEiJf5WBtrtBxg== Date: Sat, 2 Feb 2019 01:43:18 +0000 Message-ID: <20190202014242.30680-5-paul.burton@mips.com> References: <20190202014242.30680-1-paul.burton@mips.com> In-Reply-To: <20190202014242.30680-1-paul.burton@mips.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR01CA0021.prod.exchangelabs.com (2603:10b6:a02:80::34) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:24::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.20.1 x-originating-ip: [67.207.99.198] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR2201MB1439;6:xhAhpiiOCQ/EM8FcTCBYHa3RAJ9uQGdDqPntrXqSY5WFlPGc2a8kLgrO+nj2urk4X1DwYT4J2W0tnCF+IS4d3n40rjtRYIScDFxprNcwNBqkJNdKjHPW1vCEKSTpCkMlQuvGywiS/EK3sToRaOjF5DX8+PgnVcSp7rKVCWyBAzt2l+scAmHykY6aP0Z8HKXzKBUNFvwoRYNEApRO/e4AvYDsayUo9WBZj1WQPIjRZ1kxrl6fkKuHwu1a1tL/ZRp1VboqEzomG3RPkKRQ1dZyz8X1kxlAko9J4W0Q8ED02yn2skzqHRagOvU6HzBLNqnNqnpw12c07TK2Fetd/AXNVKK2AhXQ3x0P9u5t3jcg5i13PCcSEyRi/d9v2i3Q9CgdbgO5yYZXC5L3TdMmfzjKiYpEjJ+Tb42Ogo4KxkE7f5B+VPpsvhdt9WaJrTmnx5H4q4BGwh2XnwtFzdKfSPkjyA==;5:lvMsjvcPT8JWtJLPMOtu9Z/3+5zMbwuTPzs8Wax6/gmPvkHFUahAt7JC16ZP3yU0FPYJTwB5Tpgy/7st8k0eLzgW9a5R2v36qcX97JOFna4A2i1M+LyKxnY5TVlr/s9YQhj47pt1Gdj57Re5RGRRWbnVrkfiAvOic+CDMGOqBUKFMF9w4krIerctPBsnpHXiT1rRpXHQzaZdJvOB8oS1OA==;7:U4QeVOHN9id6DV/52ixwNckI4h+Ih3rEH6ETm3eNzfzWkUMwMpTuJMzygu745B6xNLerQEy944LKvjwXmHXIKNvF0xC9ipZcJ+/est1HWbCSfW4qpE9eZxRmAX9PiKAopyvVyFm+fS2rCIwIZ+L8NA== x-ms-office365-filtering-correlation-id: 4883a327-ec5b-4dd7-55cf-08d688afce61 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600110)(711020)(4605077)(2017052603328)(7153060)(7193020);SRVR:MWHPR2201MB1439; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4883a327-ec5b-4dd7-55cf-08d688afce61 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Feb 2019 01:43:18.1602 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1439 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org If drop_mmu_context() is called with an mm that is not currently active on the local CPU then there's no need for us to stop & start a hardware page table walker because it can't be fetching entries for the ASID corresponding to the mm we're operating on. Move the htw_stop() & htw_start() calls into the block which we run only if the mm is currently active, in order to avoid the redundant work. Signed-off-by: Paul Burton --- arch/mips/include/asm/mmu_context.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mm= u_context.h index 0d050d781737..5d0a73a5cf40 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -184,17 +184,18 @@ drop_mmu_context(struct mm_struct *mm) unsigned int cpu; =20 local_irq_save(flags); - htw_stop(); =20 cpu =3D smp_processor_id(); if (cpumask_test_cpu(cpu, mm_cpumask(mm))) { + htw_stop(); get_new_mmu_context(mm); write_c0_entryhi(cpu_asid(cpu, mm)); + htw_start(); } else { /* will get a new context next time */ cpu_context(cpu, mm) =3D 0; } - htw_start(); + local_irq_restore(flags); } =20 --=20 2.20.1