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Tue, 04 Apr 2023 09:42:50 -0400 X-MC-Unique: 5BjHu8A0ORC4zh0ZPovsnQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E0B332A59564; Tue, 4 Apr 2023 13:42:48 +0000 (UTC) Received: from ypodemsk.tlv.csb (unknown [10.39.194.160]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 41AAB2166B29; Tue, 4 Apr 2023 13:42:40 +0000 (UTC) From: Yair Podemsky To: linux@armlinux.org.uk, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, will@kernel.org, aneesh.kumar@linux.ibm.com, akpm@linux-foundation.org, peterz@infradead.org, arnd@arndb.de, keescook@chromium.org, paulmck@kernel.org, jpoimboe@kernel.org, samitolvanen@google.com, frederic@kernel.org, ardb@kernel.org, juerg.haefliger@canonical.com, rmk+kernel@armlinux.org.uk, geert+renesas@glider.be, tony@atomide.com, linus.walleij@linaro.org, sebastian.reichel@collabora.com, nick.hawkins@hpe.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, mtosatti@redhat.com, vschneid@redhat.com, dhildenb@redhat.com Cc: ypodemsk@redhat.com, alougovs@redhat.com Subject: [PATCH 0/3] send tlb_remove_table_smp_sync IPI only to necessary CPUs Date: Tue, 4 Apr 2023 16:42:21 +0300 Message-Id: <20230404134224.137038-1-ypodemsk@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Rspamd-Queue-Id: 32545A0004 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: zriywduiir7qop9yrxrocr4i33perb4r X-HE-Tag: 1680615775-426457 X-HE-Meta: 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 5sRbETBo 3lG4J6EEyggUNhkHskojmVoIQ+6YJqM0VEWpw9Klh6gsIghPcEH7XauJKkmW+ixjzjuzjXyDUPegw9ukWbgz9kt82977RlfsvsoHuw0U5GL6BUkvvrOZ+QmM1CjoPLtvva64qkvp4vedB+yXIIIWWxVHGPY7K9UmDrzXoolR8S+EYAkIVO7NO9r9fzKyGRDu0dM/XdkXDqPSLa5GzS+adU+HkYHViKurX4ja7KVVHkYJMBDk51DbhRjj9UT/kf5pIHeJ1KM75KjKKXAjywmRKSfq400z8tl2zTqo7EY+aU9gUa/s= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Currently the tlb_remove_table_smp_sync IPI is sent to all CPUs indiscriminately, this causes unnecessary work and delays notable in real-time use-cases and isolated cpus. By limiting the IPI to only be sent to cpus referencing the effected mm and in kernel mode latency is improved. a config to differentiate architectures that support mm_cpumask from those that don't will allow safe usage of this feature. Yair Podemsky (3): arch: Introduce ARCH_HAS_CPUMASK_BITS mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to CPUs in kernel mode -- 2.31.1