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[60.242.147.73]) by smtp.gmail.com with ESMTPSA id q68sm5779056pjq.45.2021.06.04.18.42.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Jun 2021 18:42:42 -0700 (PDT) From: Nicholas Piggin To: Andrew Morton Cc: Nicholas Piggin , Randy Dunlap , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, Anton Blanchard , Andy Lutomirski Subject: [PATCH v4 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Sat, 5 Jun 2021 11:42:16 +1000 Message-Id: <20210605014216.446867-5-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210605014216.446867-1-npiggin@gmail.com> References: <20210605014216.446867-1-npiggin@gmail.com> MIME-Version: 1.0 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 05037421108F X-Stat-Signature: m7o777r8aewq3up5nk34pbuwymj5s4nn Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=WW4xgRVm; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf02.hostedemail.com: domain of npiggin@gmail.com designates 209.85.219.53 as permitted sender) smtp.mailfrom=npiggin@gmail.com X-HE-Tag: 1622867307-616313 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: On a 16-socket 192-core POWER8 system, a context switching benchmark with as many software threads as CPUs (so each switch will go in and out of idle), upstream can achieve a rate of about 1 million context switches per second. After this patch it goes up to 118 million. Signed-off-by: Nicholas Piggin --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 088dd2afcfe4..8a092eedc692 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -252,6 +252,7 @@ config PPC select IRQ_FORCED_THREADING select MMU_GATHER_PAGE_SIZE select MMU_GATHER_RCU_TABLE_FREE + select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE select NEED_SG_DMA_LENGTH