refperf: Add a test to measure performance of read-side synchronization
Add a test for comparing the performance of RCU with various read-side synchronization mechanisms. The test has proved useful for collecting data and performing these comparisons. Currently RCU, SRCU, reader-writer lock, reader-writer semaphore and reference counting can be measured using refperf.perf_type parameter. Each invocation of the test runs measures performance of a specific mechanism. The maximum number of CPUs to concurrently run readers on is chosen by the test itself and is 75% of the total number of CPUs. So if you had 24 CPUs, the test runs with a maximum of 18 parallel readers. A number of experiments are conducted, and in each experiment, the number of readers is increased by 1, upto the 75% of CPUs mark. During each experiment, all readers execute an empty loop with refperf.loops iterations and time the total loop duration. This is then averaged. Example output: Parameters "refperf.perf_type=srcu refperf.loops=2000000" looks like: [ 3.347133] srcu-ref-perf: [ 3.347133] Threads Time(ns) [ 3.347133] 1 36 [ 3.347133] 2 34 [ 3.347133] 3 34 [ 3.347133] 4 34 [ 3.347133] 5 33 [ 3.347133] 6 33 [ 3.347133] 7 33 [ 3.347133] 8 33 [ 3.347133] 9 33 [ 3.347133] 10 33 [ 3.347133] 11 33 [ 3.347133] 12 33 [ 3.347133] 13 33 [ 3.347133] 14 33 [ 3.347133] 15 32 [ 3.347133] 16 33 [ 3.347133] 17 33 [ 3.347133] 18 34 Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Joel Fernandes (Google)
Paul E. McKenney
parent
7e866460cc
commit
653ed64b01
@ -61,6 +61,25 @@ config RCU_TORTURE_TEST
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Say M if you want the RCU torture tests to build as a module.
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Say N if you are unsure.
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config RCU_REF_PERF_TEST
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tristate "Performance tests for read-side synchronization (RCU and others)"
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depends on DEBUG_KERNEL
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select TORTURE_TEST
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select SRCU
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select TASKS_RCU
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select TASKS_RUDE_RCU
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select TASKS_TRACE_RCU
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default n
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help
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This option provides a kernel module that runs performance tests
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useful comparing RCU with various read-side synchronization mechanisms.
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The kernel module may be built after the fact on the running kernel to be
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tested, if desired.
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Say Y here if you want these performance tests built into the kernel.
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Say M if you want to build it as a module instead.
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Say N if you are unsure.
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config RCU_CPU_STALL_TIMEOUT
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int "RCU CPU stall timeout in seconds"
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depends on RCU_STALL_COMMON
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@ -12,6 +12,7 @@ obj-$(CONFIG_TREE_SRCU) += srcutree.o
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obj-$(CONFIG_TINY_SRCU) += srcutiny.o
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obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
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obj-$(CONFIG_RCU_PERF_TEST) += rcuperf.o
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obj-$(CONFIG_RCU_REF_PERF_TEST) += refperf.o
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obj-$(CONFIG_TREE_RCU) += tree.o
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obj-$(CONFIG_TINY_RCU) += tiny.o
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obj-$(CONFIG_RCU_NEED_SEGCBLIST) += rcu_segcblist.o
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558
kernel/rcu/refperf.c
Normal file
558
kernel/rcu/refperf.c
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@ -0,0 +1,558 @@
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// SPDX-License-Identifier: GPL-2.0+
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//
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// Performance test comparing RCU vs other mechanisms
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// for acquiring references on objects.
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//
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// Copyright (C) Google, 2020.
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//
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// Author: Joel Fernandes <joel@joelfernandes.org>
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#define pr_fmt(fmt) fmt
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/completion.h>
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kthread.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/notifier.h>
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#include <linux/percpu.h>
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#include <linux/rcupdate.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/stat.h>
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#include <linux/srcu.h>
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#include <linux/slab.h>
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#include <linux/torture.h>
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#include <linux/types.h>
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#include "rcu.h"
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#define PERF_FLAG "-ref-perf: "
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#define PERFOUT(s, x...) \
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pr_alert("%s" PERF_FLAG s, perf_type, ## x)
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#define VERBOSE_PERFOUT(s, x...) \
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do { if (verbose) pr_alert("%s" PERF_FLAG s, perf_type, ## x); } while (0)
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#define VERBOSE_PERFOUT_ERRSTRING(s, x...) \
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do { if (verbose) pr_alert("%s" PERF_FLAG "!!! " s, perf_type, ## x); } while (0)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Joel Fernandes (Google) <joel@joelfernandes.org>");
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static char *perf_type = "rcu";
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module_param(perf_type, charp, 0444);
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MODULE_PARM_DESC(perf_type, "Type of test (rcu, srcu, refcnt, rwsem, rwlock.");
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torture_param(int, verbose, 0, "Enable verbose debugging printk()s");
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// Number of loops per experiment, all readers execute an operation concurrently
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torture_param(long, loops, 10000000, "Number of loops per experiment.");
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#ifdef MODULE
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# define REFPERF_SHUTDOWN 0
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#else
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# define REFPERF_SHUTDOWN 1
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#endif
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torture_param(bool, shutdown, REFPERF_SHUTDOWN,
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"Shutdown at end of performance tests.");
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struct reader_task {
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struct task_struct *task;
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atomic_t start;
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wait_queue_head_t wq;
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u64 last_duration_ns;
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// The average latency When 1..<this reader> are concurrently
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// running an experiment. For example, if this reader_task is
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// of index 5 in the reader_tasks array, then result is for
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// 6 cores.
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u64 result_avg;
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};
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static struct task_struct *shutdown_task;
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static wait_queue_head_t shutdown_wq;
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static struct task_struct *main_task;
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static wait_queue_head_t main_wq;
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static int shutdown_start;
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static struct reader_task *reader_tasks;
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static int nreaders;
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// Number of readers that are part of the current experiment.
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static atomic_t nreaders_exp;
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// Use to wait for all threads to start.
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static atomic_t n_init;
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// Track which experiment is currently running.
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static int exp_idx;
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// Operations vector for selecting different types of tests.
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struct ref_perf_ops {
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void (*init)(void);
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void (*cleanup)(void);
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int (*readlock)(void);
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void (*readunlock)(int idx);
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const char *name;
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};
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static struct ref_perf_ops *cur_ops;
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// Definitions for RCU ref perf testing.
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static int ref_rcu_read_lock(void) __acquires(RCU)
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{
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rcu_read_lock();
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return 0;
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}
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static void ref_rcu_read_unlock(int idx) __releases(RCU)
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{
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rcu_read_unlock();
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}
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static void rcu_sync_perf_init(void)
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{
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}
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static struct ref_perf_ops rcu_ops = {
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.init = rcu_sync_perf_init,
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.readlock = ref_rcu_read_lock,
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.readunlock = ref_rcu_read_unlock,
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.name = "rcu"
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};
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// Definitions for SRCU ref perf testing.
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DEFINE_STATIC_SRCU(srcu_refctl_perf);
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static struct srcu_struct *srcu_ctlp = &srcu_refctl_perf;
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static int srcu_ref_perf_read_lock(void) __acquires(srcu_ctlp)
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{
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return srcu_read_lock(srcu_ctlp);
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}
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static void srcu_ref_perf_read_unlock(int idx) __releases(srcu_ctlp)
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{
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srcu_read_unlock(srcu_ctlp, idx);
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}
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static struct ref_perf_ops srcu_ops = {
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.init = rcu_sync_perf_init,
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.readlock = srcu_ref_perf_read_lock,
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.readunlock = srcu_ref_perf_read_unlock,
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.name = "srcu"
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};
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// Definitions for reference count
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static atomic_t refcnt;
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static int srcu_ref_perf_refcnt_lock(void)
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{
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atomic_inc(&refcnt);
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return 0;
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}
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static void srcu_ref_perf_refcnt_unlock(int idx) __releases(srcu_ctlp)
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{
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atomic_dec(&refcnt);
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srcu_read_unlock(srcu_ctlp, idx);
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}
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static struct ref_perf_ops refcnt_ops = {
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.init = rcu_sync_perf_init,
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.readlock = srcu_ref_perf_refcnt_lock,
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.readunlock = srcu_ref_perf_refcnt_unlock,
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.name = "refcnt"
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};
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// Definitions for rwlock
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static rwlock_t test_rwlock;
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static void ref_perf_rwlock_init(void)
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{
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rwlock_init(&test_rwlock);
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}
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static int ref_perf_rwlock_lock(void)
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{
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read_lock(&test_rwlock);
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return 0;
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}
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static void ref_perf_rwlock_unlock(int idx)
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{
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read_unlock(&test_rwlock);
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}
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static struct ref_perf_ops rwlock_ops = {
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.init = ref_perf_rwlock_init,
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.readlock = ref_perf_rwlock_lock,
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.readunlock = ref_perf_rwlock_unlock,
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.name = "rwlock"
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};
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// Definitions for rwsem
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static struct rw_semaphore test_rwsem;
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static void ref_perf_rwsem_init(void)
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{
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init_rwsem(&test_rwsem);
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}
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static int ref_perf_rwsem_lock(void)
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{
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down_read(&test_rwsem);
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return 0;
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}
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static void ref_perf_rwsem_unlock(int idx)
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{
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up_read(&test_rwsem);
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}
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static struct ref_perf_ops rwsem_ops = {
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.init = ref_perf_rwsem_init,
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.readlock = ref_perf_rwsem_lock,
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.readunlock = ref_perf_rwsem_unlock,
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.name = "rwsem"
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};
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// Reader kthread. Repeatedly does empty RCU read-side
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// critical section, minimizing update-side interference.
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static int
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ref_perf_reader(void *arg)
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{
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unsigned long flags;
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long me = (long)arg;
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struct reader_task *rt = &(reader_tasks[me]);
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unsigned long spincnt;
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int idx;
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u64 start;
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s64 duration;
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VERBOSE_PERFOUT("ref_perf_reader %ld: task started", me);
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set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
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set_user_nice(current, MAX_NICE);
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atomic_inc(&n_init);
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repeat:
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VERBOSE_PERFOUT("ref_perf_reader %ld: waiting to start next experiment on cpu %d", me, smp_processor_id());
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// Wait for signal that this reader can start.
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wait_event(rt->wq, (atomic_read(&nreaders_exp) && atomic_read(&rt->start)) ||
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torture_must_stop());
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if (torture_must_stop())
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goto end;
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// Make sure that the CPU is affinitized appropriately during testing.
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WARN_ON_ONCE(smp_processor_id() != me);
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atomic_dec(&rt->start);
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// To prevent noise, keep interrupts disabled. This also has the
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// effect of preventing entries into slow path for rcu_read_unlock().
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local_irq_save(flags);
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start = ktime_get_mono_fast_ns();
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VERBOSE_PERFOUT("ref_perf_reader %ld: experiment %d started", me, exp_idx);
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for (spincnt = 0; spincnt < loops; spincnt++) {
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idx = cur_ops->readlock();
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cur_ops->readunlock(idx);
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}
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duration = ktime_get_mono_fast_ns() - start;
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local_irq_restore(flags);
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rt->last_duration_ns = WARN_ON_ONCE(duration < 0) ? 0 : duration;
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atomic_dec(&nreaders_exp);
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VERBOSE_PERFOUT("ref_perf_reader %ld: experiment %d ended, (readers remaining=%d)",
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me, exp_idx, atomic_read(&nreaders_exp));
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if (!atomic_read(&nreaders_exp))
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wake_up(&main_wq);
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if (!torture_must_stop())
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goto repeat;
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end:
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torture_kthread_stopping("ref_perf_reader");
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return 0;
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}
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void reset_readers(int n)
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{
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int i;
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struct reader_task *rt;
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for (i = 0; i < n; i++) {
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rt = &(reader_tasks[i]);
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rt->last_duration_ns = 0;
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}
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}
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// Print the results of each reader and return the sum of all their durations.
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u64 process_durations(int n)
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{
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int i;
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struct reader_task *rt;
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char buf1[64];
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char buf[512];
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u64 sum = 0;
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buf[0] = 0;
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sprintf(buf, "Experiment #%d (Format: <THREAD-NUM>:<Total loop time in ns>)",
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exp_idx);
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for (i = 0; i <= n && !torture_must_stop(); i++) {
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rt = &(reader_tasks[i]);
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sprintf(buf1, "%d: %llu\t", i, rt->last_duration_ns);
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if (i % 5 == 0)
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strcat(buf, "\n");
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strcat(buf, buf1);
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sum += rt->last_duration_ns;
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}
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strcat(buf, "\n");
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PERFOUT("%s\n", buf);
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return sum;
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}
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// The main_func is the main orchestrator, it performs a bunch of
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// experiments. For every experiment, it orders all the readers
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// involved to start and waits for them to finish the experiment. It
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// then reads their timestamps and starts the next experiment. Each
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// experiment progresses from 1 concurrent reader to N of them at which
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// point all the timestamps are printed.
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static int main_func(void *arg)
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{
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int exp, r;
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char buf1[64];
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char buf[512];
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set_cpus_allowed_ptr(current, cpumask_of(nreaders % nr_cpu_ids));
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set_user_nice(current, MAX_NICE);
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VERBOSE_PERFOUT("main_func task started");
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atomic_inc(&n_init);
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// Wait for all threads to start.
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wait_event(main_wq, atomic_read(&n_init) == (nreaders + 1));
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// Start exp readers up per experiment
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for (exp = 0; exp < nreaders && !torture_must_stop(); exp++) {
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if (torture_must_stop())
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goto end;
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reset_readers(exp);
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atomic_set(&nreaders_exp, exp + 1);
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exp_idx = exp;
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for (r = 0; r <= exp; r++) {
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atomic_set(&reader_tasks[r].start, 1);
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wake_up(&reader_tasks[r].wq);
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}
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VERBOSE_PERFOUT("main_func: experiment started, waiting for %d readers",
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exp);
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wait_event(main_wq,
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!atomic_read(&nreaders_exp) || torture_must_stop());
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VERBOSE_PERFOUT("main_func: experiment ended");
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if (torture_must_stop())
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goto end;
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reader_tasks[exp].result_avg = process_durations(exp) / ((exp + 1) * loops);
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}
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// Print the average of all experiments
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PERFOUT("END OF TEST. Calculating average duration per loop (nanoseconds)...\n");
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buf[0] = 0;
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strcat(buf, "\n");
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strcat(buf, "Threads\tTime(ns)\n");
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for (exp = 0; exp < nreaders; exp++) {
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sprintf(buf1, "%d\t%llu\n", exp + 1, reader_tasks[exp].result_avg);
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strcat(buf, buf1);
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}
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PERFOUT("%s", buf);
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// This will shutdown everything including us.
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if (shutdown) {
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shutdown_start = 1;
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wake_up(&shutdown_wq);
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}
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// Wait for torture to stop us
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while (!torture_must_stop())
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schedule_timeout_uninterruptible(1);
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end:
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torture_kthread_stopping("main_func");
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return 0;
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}
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static void
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ref_perf_print_module_parms(struct ref_perf_ops *cur_ops, const char *tag)
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{
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pr_alert("%s" PERF_FLAG
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"--- %s: verbose=%d shutdown=%d loops=%ld\n", perf_type, tag,
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verbose, shutdown, loops);
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}
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static void
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ref_perf_cleanup(void)
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{
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||||
int i;
|
||||
|
||||
if (torture_cleanup_begin())
|
||||
return;
|
||||
|
||||
if (!cur_ops) {
|
||||
torture_cleanup_end();
|
||||
return;
|
||||
}
|
||||
|
||||
if (reader_tasks) {
|
||||
for (i = 0; i < nreaders; i++)
|
||||
torture_stop_kthread("ref_perf_reader",
|
||||
reader_tasks[i].task);
|
||||
}
|
||||
kfree(reader_tasks);
|
||||
|
||||
torture_stop_kthread("main_task", main_task);
|
||||
kfree(main_task);
|
||||
|
||||
// Do perf-type-specific cleanup operations.
|
||||
if (cur_ops->cleanup != NULL)
|
||||
cur_ops->cleanup();
|
||||
|
||||
torture_cleanup_end();
|
||||
}
|
||||
|
||||
// Shutdown kthread. Just waits to be awakened, then shuts down system.
|
||||
static int
|
||||
ref_perf_shutdown(void *arg)
|
||||
{
|
||||
wait_event(shutdown_wq, shutdown_start);
|
||||
|
||||
smp_mb(); // Wake before output.
|
||||
ref_perf_cleanup();
|
||||
kernel_power_off();
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int __init
|
||||
ref_perf_init(void)
|
||||
{
|
||||
long i;
|
||||
int firsterr = 0;
|
||||
static struct ref_perf_ops *perf_ops[] = {
|
||||
&rcu_ops, &srcu_ops, &refcnt_ops, &rwlock_ops, &rwsem_ops,
|
||||
};
|
||||
|
||||
if (!torture_init_begin(perf_type, verbose))
|
||||
return -EBUSY;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(perf_ops); i++) {
|
||||
cur_ops = perf_ops[i];
|
||||
if (strcmp(perf_type, cur_ops->name) == 0)
|
||||
break;
|
||||
}
|
||||
if (i == ARRAY_SIZE(perf_ops)) {
|
||||
pr_alert("rcu-perf: invalid perf type: \"%s\"\n", perf_type);
|
||||
pr_alert("rcu-perf types:");
|
||||
for (i = 0; i < ARRAY_SIZE(perf_ops); i++)
|
||||
pr_cont(" %s", perf_ops[i]->name);
|
||||
pr_cont("\n");
|
||||
WARN_ON(!IS_MODULE(CONFIG_RCU_REF_PERF_TEST));
|
||||
firsterr = -EINVAL;
|
||||
cur_ops = NULL;
|
||||
goto unwind;
|
||||
}
|
||||
if (cur_ops->init)
|
||||
cur_ops->init();
|
||||
|
||||
ref_perf_print_module_parms(cur_ops, "Start of test");
|
||||
|
||||
// Shutdown task
|
||||
if (shutdown) {
|
||||
init_waitqueue_head(&shutdown_wq);
|
||||
firsterr = torture_create_kthread(ref_perf_shutdown, NULL,
|
||||
shutdown_task);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
|
||||
// Reader tasks (~75% of online CPUs).
|
||||
nreaders = (num_online_cpus() >> 1) + (num_online_cpus() >> 2);
|
||||
reader_tasks = kcalloc(nreaders, sizeof(reader_tasks[0]),
|
||||
GFP_KERNEL);
|
||||
if (!reader_tasks) {
|
||||
VERBOSE_PERFOUT_ERRSTRING("out of memory");
|
||||
firsterr = -ENOMEM;
|
||||
goto unwind;
|
||||
}
|
||||
|
||||
VERBOSE_PERFOUT("Starting %d reader threads\n", nreaders);
|
||||
|
||||
for (i = 0; i < nreaders; i++) {
|
||||
firsterr = torture_create_kthread(ref_perf_reader, (void *)i,
|
||||
reader_tasks[i].task);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
|
||||
init_waitqueue_head(&(reader_tasks[i].wq));
|
||||
}
|
||||
|
||||
// Main Task
|
||||
init_waitqueue_head(&main_wq);
|
||||
firsterr = torture_create_kthread(main_func, NULL, main_task);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
schedule_timeout_uninterruptible(1);
|
||||
|
||||
|
||||
// Wait until all threads start
|
||||
while (atomic_read(&n_init) < nreaders + 1)
|
||||
schedule_timeout_uninterruptible(1);
|
||||
|
||||
wake_up(&main_wq);
|
||||
|
||||
torture_init_end();
|
||||
return 0;
|
||||
|
||||
unwind:
|
||||
torture_init_end();
|
||||
ref_perf_cleanup();
|
||||
return firsterr;
|
||||
}
|
||||
|
||||
module_init(ref_perf_init);
|
||||
module_exit(ref_perf_cleanup);
|
||||
Loading…
Reference in New Issue
Block a user