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Mon, 11 Dec 2017 14:16:16 +0000 From: Yury Norov To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] IPI performance benchmark Date: Mon, 11 Dec 2017 17:16:00 +0300 Message-Id: <20171211141600.24401-1-ynorov@caviumnetworks.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 X-Originating-IP: [50.233.148.156] X-ClientProxiedBy: DB3PR0202CA0003.eurprd02.prod.outlook.com (2603:10a6:8:1::16) To DM5PR0701MB3831.namprd07.prod.outlook.com (2603:10b6:4:7f::29) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5917cfa7-441e-48f4-649c-08d540a1beb3 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(5600026)(4604075)(4534020)(4602075)(4627115)(201703031133081)(201702281549075)(2017052603307); SRVR:DM5PR0701MB3831; X-Microsoft-Exchange-Diagnostics: 1; DM5PR0701MB3831; 3:8ATK5iN3yoyLTIKXL0Fu0x6mhBJjE3hEJ+wn3N9xPcaZAS6kajqk39yptRAdkNkxCNn7jqxXIJUuM7a47NVLgpleJNw3wCueJRENAYfzNd9913mjXOS12ua7iFoq02HVpD6bH+mti4CRPvasEe3FRiNk43+ElufCJDrgmGTNVbz7or1dEldd55x3AlJKPufKPsQ89y7/1XObVDtcQXCBtE7lfGVgd87itq+gz8OCsS0sgMDX6mWZiZmL8S9JQT8y; 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The scenarios are: Dry-run: do everything except actually sending IPI. Useful to estimate system overhead. Self-IPI: Send IPI to self CPU. Normal IPI: Send IPI to some other CPU. Broadcast IPI: Send broadcast IPI to all online CPUs. For virtualized guests, sending and reveiving IPIs causes guest exit. I used this test to measure performance impact on KVM subsystem of Christoffer Dall's series "Optimize KVM/ARM for VHE systems". https://www.spinics.net/lists/kvm/msg156755.html Test machine is ThunderX2, 112 online CPUs. Below the results normalized to host dry-run time. Smaller - better. Host, v4.14: Dry-run: 0 1 Self-IPI: 9 18 Normal IPI: 81 110 Broadcast IPI: 0 2106 Guest, v4.14: Dry-run: 0 1 Self-IPI: 10 18 Normal IPI: 305 525 Broadcast IPI: 0 9729 Guest, v4.14 + VHE: Dry-run: 0 1 Self-IPI: 9 18 Normal IPI: 176 343 Broadcast IPI: 0 9885 CC: Andrew Morton CC: Ashish Kalra CC: Christoffer Dall CC: Geert Uytterhoeven CC: Linu Cherian CC: Sunil Goutham Signed-off-by: Yury Norov --- arch/Kconfig | 10 ++++ kernel/Makefile | 1 + kernel/ipi_benchmark.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 145 insertions(+) create mode 100644 kernel/ipi_benchmark.c diff --git a/arch/Kconfig b/arch/Kconfig index 057370a0ac4e..80d6ef439199 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -82,6 +82,16 @@ config JUMP_LABEL ( On 32-bit x86, the necessary options added to the compiler flags may increase the size of the kernel slightly. ) +config IPI_BENCHMARK + tristate "Test IPI performance on SMP systems" + depends on SMP + help + Test IPI performance on SMP systems. If system has only one online + CPU, sending IPI to other CPU is obviously not possible, and ENOENT + is returned for corresponding test. + + If unsure, say N. + config STATIC_KEYS_SELFTEST bool "Static key selftest" depends on JUMP_LABEL diff --git a/kernel/Makefile b/kernel/Makefile index 172d151d429c..04e550e1990c 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_TRACEPOINTS) += trace/ obj-$(CONFIG_IRQ_WORK) += irq_work.o obj-$(CONFIG_CPU_PM) += cpu_pm.o obj-$(CONFIG_BPF) += bpf/ +obj-$(CONFIG_IPI_BENCHMARK) += ipi_benchmark.o obj-$(CONFIG_PERF_EVENTS) += events/ diff --git a/kernel/ipi_benchmark.c b/kernel/ipi_benchmark.c new file mode 100644 index 000000000000..35f1f7598c36 --- /dev/null +++ b/kernel/ipi_benchmark.c @@ -0,0 +1,134 @@ +/* + * Performance test for IPI on SMP machines. + * + * Copyright (c) 2017 Cavium Networks. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include +#include +#include +#include + +#define NTIMES 100000 + +#define POKE_ANY 0 +#define DRY_RUN 1 +#define POKE_SELF 2 +#define POKE_ALL 3 + +static void __init handle_ipi(void *t) +{ + ktime_t *time = (ktime_t *) t; + + if (time) + *time = ktime_get() - *time; +} + +static ktime_t __init send_ipi(int flags) +{ + ktime_t time; + unsigned int cpu = get_cpu(); + + switch (flags) { + case POKE_ALL: + /* If broadcasting, don't force all CPUs to update time. */ + smp_call_function_many(cpu_online_mask, handle_ipi, NULL, 1); + /* Fall thru */ + case DRY_RUN: + /* Do everything except actually sending IPI. */ + time = 0; + break; + case POKE_ANY: + cpu = cpumask_any_but(cpu_online_mask, cpu); + if (cpu >= nr_cpu_ids) { + time = -ENOENT; + break; + } + /* Fall thru */ + case POKE_SELF: + time = ktime_get(); + smp_call_function_single(cpu, handle_ipi, &time, 1); + break; + default: + time = -EINVAL; + } + + put_cpu(); + return time; +} + +static int __init __bench_ipi(unsigned long i, ktime_t *time, int flags) +{ + ktime_t t; + + *time = 0; + while (i--) { + t = send_ipi(flags); + if ((int) t < 0) + return (int) t; + + *time += t; + } + + return 0; +} + +static int __init bench_ipi(unsigned long times, int flags, + ktime_t *ipi, ktime_t *total) +{ + int ret; + + *total = ktime_get(); + ret = __bench_ipi(times, ipi, flags); + if (unlikely(ret)) + return ret; + + *total = ktime_get() - *total; + + return 0; +} + +static int __init init_bench_ipi(void) +{ + ktime_t ipi, total; + int ret; + + ret = bench_ipi(NTIMES, DRY_RUN, &ipi, &total); + if (ret) + pr_err("Dry-run FAILED: %d\n", ret); + else + pr_err("Dry-run: %18llu, %18llu ns\n", ipi, total); + + ret = bench_ipi(NTIMES, POKE_SELF, &ipi, &total); + if (ret) + pr_err("Self-IPI FAILED: %d\n", ret); + else + pr_err("Self-IPI: %18llu, %18llu ns\n", ipi, total); + + ret = bench_ipi(NTIMES, POKE_ANY, &ipi, &total); + if (ret) + pr_err("Normal IPI FAILED: %d\n", ret); + else + pr_err("Normal IPI: %18llu, %18llu ns\n", ipi, total); + + ret = bench_ipi(NTIMES, POKE_ALL, &ipi, &total); + if (ret) + pr_err("Broadcast IPI FAILED: %d\n", ret); + else + pr_err("Broadcast IPI: %18llu, %18llu ns\n", ipi, total); + + /* Return error to avoid annoying rmmod. */ + return -EINVAL; +} +module_init(init_bench_ipi); + +MODULE_LICENSE("GPL");