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[193.116.102.45]) by smtp.gmail.com with ESMTPSA id y2-20020a17090a16c200b002272616d3e1sm738462pje.40.2023.01.18.00.00.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jan 2023 00:00:37 -0800 (PST) From: Nicholas Piggin To: Andrew Morton Cc: Nicholas Piggin , Andy Lutomirski , Linus Torvalds , linux-arch , linux-mm , linuxppc-dev@lists.ozlabs.org Subject: [PATCH v6 4/5] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Wed, 18 Jan 2023 18:00:10 +1000 Message-Id: <20230118080011.2258375-5-npiggin@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230118080011.2258375-1-npiggin@gmail.com> References: <20230118080011.2258375-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 61AC0100015 X-Stat-Signature: 6unwi98nx6b95miukn1xezipssc6j6pj X-HE-Tag: 1674028839-758787 X-HE-Meta: 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 FGrGeUtY oRsaglW5aS1ObkRjx1BlgxPQnXXSmt0ZbtEOB5HCSotIGz/Yvs9g6652NxPujvlQpuc1jpLV8Y8VlshYm1drGkAWFpC6nNLU5XFV2SA+B7UosnhGsCTSmxyzCb9DD+yFS8QV3sHu163SXYTEc2e1z7e1hC3E7IOp8kQWOZkBC1O4nNo8= 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, due to contention on the mm refcount. 64s meets the prerequisites for CONFIG_MMU_LAZY_TLB_SHOOTDOWN, so enable the option. This increases the above benchmark to 118 million context switches per second. This generates 314 additional IPI interrupts on a 144 CPU system doing a kernel compile, which is in the noise in terms of kernel cycles. 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 b8c4ac56bddc..600ace5a7f1a 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -265,6 +265,7 @@ config PPC select MMU_GATHER_PAGE_SIZE select MMU_GATHER_RCU_TABLE_FREE select MMU_GATHER_MERGE_VMAS + 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_PER_CPU_EMBED_FIRST_CHUNK if PPC64 -- 2.37.2