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[193.116.103.132]) by smtp.gmail.com with ESMTPSA id d4sm9762607pjz.28.2020.11.28.08.02.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Nov 2020 08:02:27 -0800 (PST) From: Nicholas Piggin To: linux-kernel@vger.kernel.org Cc: Nicholas Piggin , x86@kernel.org, Mathieu Desnoyers , Arnd Bergmann , Peter Zijlstra , linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, Anton Blanchard Subject: [PATCH 8/8] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Sun, 29 Nov 2020 02:01:41 +1000 Message-Id: <20201128160141.1003903-9-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20201128160141.1003903-1-npiggin@gmail.com> References: <20201128160141.1003903-1-npiggin@gmail.com> MIME-Version: 1.0 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 e9f13fe08492..d4793c0229d2 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -231,6 +231,7 @@ config PPC select HAVE_PERF_USER_STACK_DUMP select MMU_GATHER_RCU_TABLE_FREE select MMU_GATHER_PAGE_SIZE + select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN select HAVE_SYSCALL_TRACEPOINTS