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Tue, 20 Jun 2023 14:46:34 +0000 (UTC) Received: from ypodemsk.tlv.csb (unknown [10.39.195.147]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 863679E9C; Tue, 20 Jun 2023 14:46:25 +0000 (UTC) From: Yair Podemsky To: mtosatti@redhat.com, ppandit@redhat.com, david@redhat.com, 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, hpa@zytor.com, keescook@chromium.org, paulmck@kernel.org, frederic@kernel.org, will@kernel.org, peterz@infradead.org, ardb@kernel.org, samitolvanen@google.com, juerg.haefliger@canonical.com, arnd@arndb.de, rmk+kernel@armlinux.org.uk, geert+renesas@glider.be, linus.walleij@linaro.org, akpm@linux-foundation.org, sebastian.reichel@collabora.com, rppt@kernel.org, aneesh.kumar@linux.ibm.com, x86@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, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/2] send tlb_remove_table_smp_sync IPI only to necessary CPUs Date: Tue, 20 Jun 2023 17:46:16 +0300 Message-Id: <20230620144618.125703-1-ypodemsk@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ypodemsk@redhat.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. a config to differentiate architectures that support mm_cpumask from those that don't will allow safe usage of this feature. changes from -v1: - Previous version included a patch to only send the IPI to CPU's with context_tracking in the kernel space, this was removed due to race condition concerns. - for archs that do not maintain mm_cpumask the mask used should be cpu_online_mask (Peter Zijlstra). v1: https://lore.kernel.org/all/20230404134224.137038-1-ypodemsk@redhat.com/ Yair Podemsky (2): arch: Introduce ARCH_HAS_CPUMASK_BITS mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs arch/Kconfig | 8 ++++++++ arch/arm/Kconfig | 1 + arch/powerpc/Kconfig | 1 + arch/s390/Kconfig | 1 + arch/sparc/Kconfig | 1 + arch/x86/Kconfig | 1 + include/asm-generic/tlb.h | 4 ++-- mm/khugepaged.c | 4 ++-- mm/mmu_gather.c | 17 ++++++++++++----- 9 files changed, 29 insertions(+), 9 deletions(-) -- 2.39.3