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rcutorture: Add RCU grace-period performance tests
This commit adds a new rcuperf module that carries out simple performance tests of RCU grace periods. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
parent
291783b8ad
commit
8704baab9b
@ -5,6 +5,7 @@ KCOV_INSTRUMENT := n
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obj-y += update.o sync.o
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obj-$(CONFIG_SRCU) += srcu.o
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obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
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obj-$(CONFIG_RCU_PERF_TEST) += rcuperf.o
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obj-$(CONFIG_TREE_RCU) += tree.o
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obj-$(CONFIG_PREEMPT_RCU) += tree.o
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obj-$(CONFIG_TREE_RCU_TRACE) += tree_trace.o
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637
kernel/rcu/rcuperf.c
Normal file
637
kernel/rcu/rcuperf.c
Normal file
@ -0,0 +1,637 @@
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/*
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* Read-Copy Update module-based performance-test facility
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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* Copyright (C) IBM Corporation, 2015
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*
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* Authors: Paul E. McKenney <paulmck@us.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/smp.h>
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#include <linux/rcupdate.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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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/moduleparam.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/freezer.h>
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#include <linux/cpu.h>
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#include <linux/delay.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 <asm/byteorder.h>
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#include <linux/torture.h>
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#include <linux/vmalloc.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.ibm.com>");
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#define PERF_FLAG "-perf:"
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#define PERFOUT_STRING(s) \
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pr_alert("%s" PERF_FLAG s "\n", perf_type)
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#define VERBOSE_PERFOUT_STRING(s) \
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do { if (verbose) pr_alert("%s" PERF_FLAG " %s\n", perf_type, s); } while (0)
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#define VERBOSE_PERFOUT_ERRSTRING(s) \
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do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0)
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torture_param(bool, gp_exp, true, "Use expedited GP wait primitives");
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torture_param(int, nreaders, -1, "Number of RCU reader threads");
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torture_param(int, nwriters, -1, "Number of RCU updater threads");
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torture_param(bool, shutdown, false, "Shutdown at end of performance tests.");
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torture_param(bool, verbose, true, "Enable verbose debugging printk()s");
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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 RCU to performance-test (rcu, rcu_bh, ...)");
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static int nrealreaders;
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static int nrealwriters;
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static struct task_struct **writer_tasks;
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static struct task_struct **reader_tasks;
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static struct task_struct *shutdown_task;
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static u64 **writer_durations;
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static int *writer_n_durations;
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static atomic_t n_rcu_perf_reader_started;
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static atomic_t n_rcu_perf_writer_started;
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static atomic_t n_rcu_perf_writer_finished;
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static wait_queue_head_t shutdown_wq;
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static u64 t_rcu_perf_writer_started;
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static u64 t_rcu_perf_writer_finished;
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static unsigned long b_rcu_perf_writer_started;
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static unsigned long b_rcu_perf_writer_finished;
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static int rcu_perf_writer_state;
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#define RTWS_INIT 0
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#define RTWS_EXP_SYNC 1
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#define RTWS_SYNC 2
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#define RTWS_IDLE 2
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#define RTWS_STOPPING 3
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#define MAX_MEAS 10000
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#define MIN_MEAS 100
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#if defined(MODULE) || defined(CONFIG_RCU_PERF_TEST_RUNNABLE)
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#define RCUPERF_RUNNABLE_INIT 1
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#else
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#define RCUPERF_RUNNABLE_INIT 0
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#endif
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static int perf_runnable = RCUPERF_RUNNABLE_INIT;
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module_param(perf_runnable, int, 0444);
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MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot");
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/*
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* Operations vector for selecting different types of tests.
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*/
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struct rcu_perf_ops {
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int ptype;
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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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unsigned long (*started)(void);
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unsigned long (*completed)(void);
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unsigned long (*exp_completed)(void);
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void (*sync)(void);
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void (*exp_sync)(void);
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const char *name;
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};
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static struct rcu_perf_ops *cur_ops;
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/*
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* Definitions for rcu perf testing.
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*/
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static int rcu_perf_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 rcu_perf_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 unsigned long __maybe_unused rcu_no_completed(void)
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{
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return 0;
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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 rcu_perf_ops rcu_ops = {
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.ptype = RCU_FLAVOR,
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.init = rcu_sync_perf_init,
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.readlock = rcu_perf_read_lock,
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.readunlock = rcu_perf_read_unlock,
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.started = rcu_batches_started,
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.completed = rcu_batches_completed,
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.exp_completed = rcu_exp_batches_completed,
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.sync = synchronize_rcu,
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.exp_sync = synchronize_rcu_expedited,
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.name = "rcu"
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};
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/*
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* Definitions for rcu_bh perf testing.
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*/
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static int rcu_bh_perf_read_lock(void) __acquires(RCU_BH)
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{
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rcu_read_lock_bh();
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return 0;
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}
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static void rcu_bh_perf_read_unlock(int idx) __releases(RCU_BH)
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{
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rcu_read_unlock_bh();
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}
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static struct rcu_perf_ops rcu_bh_ops = {
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.ptype = RCU_BH_FLAVOR,
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.init = rcu_sync_perf_init,
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.readlock = rcu_bh_perf_read_lock,
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.readunlock = rcu_bh_perf_read_unlock,
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.started = rcu_batches_started_bh,
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.completed = rcu_batches_completed_bh,
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.exp_completed = rcu_exp_batches_completed_sched,
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.sync = synchronize_rcu_bh,
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.exp_sync = synchronize_rcu_bh_expedited,
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.name = "rcu_bh"
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};
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/*
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* Definitions for srcu perf testing.
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*/
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DEFINE_STATIC_SRCU(srcu_ctl_perf);
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static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf;
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static int srcu_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_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 unsigned long srcu_perf_completed(void)
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{
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return srcu_batches_completed(srcu_ctlp);
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}
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static void srcu_perf_synchronize(void)
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{
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synchronize_srcu(srcu_ctlp);
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}
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static void srcu_perf_synchronize_expedited(void)
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{
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synchronize_srcu_expedited(srcu_ctlp);
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}
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static struct rcu_perf_ops srcu_ops = {
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.ptype = SRCU_FLAVOR,
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.init = rcu_sync_perf_init,
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.readlock = srcu_perf_read_lock,
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.readunlock = srcu_perf_read_unlock,
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.started = NULL,
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.completed = srcu_perf_completed,
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.exp_completed = srcu_perf_completed,
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.sync = srcu_perf_synchronize,
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.exp_sync = srcu_perf_synchronize_expedited,
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.name = "srcu"
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};
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/*
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* Definitions for sched perf testing.
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*/
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static int sched_perf_read_lock(void)
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{
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preempt_disable();
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return 0;
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}
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static void sched_perf_read_unlock(int idx)
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{
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preempt_enable();
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}
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static struct rcu_perf_ops sched_ops = {
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.ptype = RCU_SCHED_FLAVOR,
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.init = rcu_sync_perf_init,
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.readlock = sched_perf_read_lock,
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.readunlock = sched_perf_read_unlock,
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.started = rcu_batches_started_sched,
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.completed = rcu_batches_completed_sched,
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.exp_completed = rcu_exp_batches_completed_sched,
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.sync = synchronize_sched,
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.exp_sync = synchronize_sched_expedited,
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.name = "sched"
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};
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#ifdef CONFIG_TASKS_RCU
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/*
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* Definitions for RCU-tasks perf testing.
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*/
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static int tasks_perf_read_lock(void)
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{
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return 0;
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}
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static void tasks_perf_read_unlock(int idx)
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{
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}
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static struct rcu_perf_ops tasks_ops = {
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.ptype = RCU_TASKS_FLAVOR,
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.init = rcu_sync_perf_init,
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.readlock = tasks_perf_read_lock,
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.readunlock = tasks_perf_read_unlock,
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.started = rcu_no_completed,
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.completed = rcu_no_completed,
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.sync = synchronize_rcu_tasks,
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.exp_sync = synchronize_rcu_tasks,
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.name = "tasks"
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};
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#define RCUPERF_TASKS_OPS &tasks_ops,
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static bool __maybe_unused torturing_tasks(void)
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{
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return cur_ops == &tasks_ops;
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}
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#else /* #ifdef CONFIG_TASKS_RCU */
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#define RCUPERF_TASKS_OPS
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static bool __maybe_unused torturing_tasks(void)
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{
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return false;
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}
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#endif /* #else #ifdef CONFIG_TASKS_RCU */
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/*
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* If performance tests complete, wait for shutdown to commence.
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*/
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static void rcu_perf_wait_shutdown(void)
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{
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cond_resched_rcu_qs();
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if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters)
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return;
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while (!torture_must_stop())
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schedule_timeout_uninterruptible(1);
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}
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/*
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* RCU perf reader kthread. Repeatedly does empty RCU read-side
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* critical section, minimizing update-side interference.
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*/
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static int
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rcu_perf_reader(void *arg)
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{
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unsigned long flags;
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int idx;
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VERBOSE_PERFOUT_STRING("rcu_perf_reader task started");
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set_user_nice(current, MAX_NICE);
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atomic_inc(&n_rcu_perf_reader_started);
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do {
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local_irq_save(flags);
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idx = cur_ops->readlock();
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cur_ops->readunlock(idx);
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local_irq_restore(flags);
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rcu_perf_wait_shutdown();
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} while (!torture_must_stop());
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torture_kthread_stopping("rcu_perf_reader");
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return 0;
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}
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/*
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* RCU perf writer kthread. Repeatedly does a grace period.
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*/
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static int
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rcu_perf_writer(void *arg)
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{
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int i = 0;
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int i_max;
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long me = (long)arg;
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bool started = false, done = false, alldone = false;
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u64 t;
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u64 *wdp;
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u64 *wdpp = writer_durations[me];
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VERBOSE_PERFOUT_STRING("rcu_perf_writer task started");
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WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp);
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WARN_ON(rcu_gp_is_normal() && gp_exp);
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WARN_ON(!wdpp);
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t = ktime_get_mono_fast_ns();
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if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) {
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t_rcu_perf_writer_started = t;
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if (gp_exp) {
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b_rcu_perf_writer_started =
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cur_ops->exp_completed() / 2;
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} else {
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b_rcu_perf_writer_started =
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cur_ops->completed();
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}
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}
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do {
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wdp = &wdpp[i];
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*wdp = ktime_get_mono_fast_ns();
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if (gp_exp) {
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rcu_perf_writer_state = RTWS_EXP_SYNC;
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cur_ops->exp_sync();
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} else {
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rcu_perf_writer_state = RTWS_SYNC;
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cur_ops->sync();
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}
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rcu_perf_writer_state = RTWS_IDLE;
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t = ktime_get_mono_fast_ns();
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*wdp = t - *wdp;
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i_max = i;
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if (!started &&
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atomic_read(&n_rcu_perf_writer_started) >= nrealwriters)
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started = true;
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if (!done && i >= MIN_MEAS) {
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done = true;
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pr_alert("%s" PERF_FLAG
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"rcu_perf_writer %ld has %d measurements\n",
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perf_type, me, MIN_MEAS);
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if (atomic_inc_return(&n_rcu_perf_writer_finished) >=
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nrealwriters) {
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PERFOUT_STRING("Test complete");
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t_rcu_perf_writer_finished = t;
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if (gp_exp) {
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b_rcu_perf_writer_finished =
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cur_ops->exp_completed() / 2;
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} else {
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b_rcu_perf_writer_finished =
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cur_ops->completed();
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}
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smp_mb(); /* Assign before wake. */
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wake_up(&shutdown_wq);
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}
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}
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if (done && !alldone &&
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atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters)
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alldone = true;
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if (started && !alldone && i < MAX_MEAS - 1)
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i++;
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rcu_perf_wait_shutdown();
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} while (!torture_must_stop());
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rcu_perf_writer_state = RTWS_STOPPING;
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writer_n_durations[me] = i_max;
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torture_kthread_stopping("rcu_perf_writer");
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return 0;
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}
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static inline void
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rcu_perf_print_module_parms(struct rcu_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: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n",
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perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown);
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}
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static void
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rcu_perf_cleanup(void)
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{
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int i;
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int j;
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int ngps = 0;
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u64 *wdp;
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u64 *wdpp;
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if (torture_cleanup_begin())
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return;
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if (reader_tasks) {
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for (i = 0; i < nrealreaders; i++)
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torture_stop_kthread(rcu_perf_reader,
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reader_tasks[i]);
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kfree(reader_tasks);
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}
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if (writer_tasks) {
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for (i = 0; i < nrealwriters; i++) {
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torture_stop_kthread(rcu_perf_writer,
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writer_tasks[i]);
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if (!writer_n_durations)
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continue;
|
||||
j = writer_n_durations[i];
|
||||
pr_alert("%s%s writer %d gps: %d\n",
|
||||
perf_type, PERF_FLAG, i, j);
|
||||
ngps += j;
|
||||
}
|
||||
pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n",
|
||||
perf_type, PERF_FLAG,
|
||||
t_rcu_perf_writer_started, t_rcu_perf_writer_finished,
|
||||
t_rcu_perf_writer_finished -
|
||||
t_rcu_perf_writer_started,
|
||||
ngps,
|
||||
b_rcu_perf_writer_finished -
|
||||
b_rcu_perf_writer_started);
|
||||
for (i = 0; i < nrealwriters; i++) {
|
||||
if (!writer_durations)
|
||||
break;
|
||||
if (!writer_n_durations)
|
||||
continue;
|
||||
wdpp = writer_durations[i];
|
||||
if (!wdpp)
|
||||
continue;
|
||||
for (j = 0; j <= writer_n_durations[i]; j++) {
|
||||
wdp = &wdpp[j];
|
||||
pr_alert("%s%s %4d writer-duration: %5d %llu\n",
|
||||
perf_type, PERF_FLAG,
|
||||
i, j, *wdp);
|
||||
if (j % 100 == 0)
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
kfree(writer_durations[i]);
|
||||
}
|
||||
kfree(writer_tasks);
|
||||
kfree(writer_durations);
|
||||
kfree(writer_n_durations);
|
||||
}
|
||||
|
||||
/* Do flavor-specific cleanup operations. */
|
||||
if (cur_ops->cleanup != NULL)
|
||||
cur_ops->cleanup();
|
||||
|
||||
torture_cleanup_end();
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the number if non-negative. If -1, the number of CPUs.
|
||||
* If less than -1, that much less than the number of CPUs, but
|
||||
* at least one.
|
||||
*/
|
||||
static int compute_real(int n)
|
||||
{
|
||||
int nr;
|
||||
|
||||
if (n >= 0) {
|
||||
nr = n;
|
||||
} else {
|
||||
nr = num_online_cpus() + 1 + n;
|
||||
if (nr <= 0)
|
||||
nr = 1;
|
||||
}
|
||||
return nr;
|
||||
}
|
||||
|
||||
/*
|
||||
* RCU perf shutdown kthread. Just waits to be awakened, then shuts
|
||||
* down system.
|
||||
*/
|
||||
static int
|
||||
rcu_perf_shutdown(void *arg)
|
||||
{
|
||||
do {
|
||||
wait_event(shutdown_wq,
|
||||
atomic_read(&n_rcu_perf_writer_finished) >=
|
||||
nrealwriters);
|
||||
} while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters);
|
||||
smp_mb(); /* Wake before output. */
|
||||
rcu_perf_cleanup();
|
||||
kernel_power_off();
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int __init
|
||||
rcu_perf_init(void)
|
||||
{
|
||||
long i;
|
||||
int firsterr = 0;
|
||||
static struct rcu_perf_ops *perf_ops[] = {
|
||||
&rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops,
|
||||
RCUPERF_TASKS_OPS
|
||||
};
|
||||
|
||||
if (!torture_init_begin(perf_type, verbose, &perf_runnable))
|
||||
return -EBUSY;
|
||||
|
||||
/* Process args and tell the world that the perf'er is on the job. */
|
||||
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_alert(" %s", perf_ops[i]->name);
|
||||
pr_alert("\n");
|
||||
firsterr = -EINVAL;
|
||||
goto unwind;
|
||||
}
|
||||
if (cur_ops->init)
|
||||
cur_ops->init();
|
||||
|
||||
nrealwriters = compute_real(nwriters);
|
||||
nrealreaders = compute_real(nreaders);
|
||||
atomic_set(&n_rcu_perf_reader_started, 0);
|
||||
atomic_set(&n_rcu_perf_writer_started, 0);
|
||||
atomic_set(&n_rcu_perf_writer_finished, 0);
|
||||
rcu_perf_print_module_parms(cur_ops, "Start of test");
|
||||
|
||||
/* Start up the kthreads. */
|
||||
|
||||
if (shutdown) {
|
||||
init_waitqueue_head(&shutdown_wq);
|
||||
firsterr = torture_create_kthread(rcu_perf_shutdown, NULL,
|
||||
shutdown_task);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]),
|
||||
GFP_KERNEL);
|
||||
if (reader_tasks == NULL) {
|
||||
VERBOSE_PERFOUT_ERRSTRING("out of memory");
|
||||
firsterr = -ENOMEM;
|
||||
goto unwind;
|
||||
}
|
||||
for (i = 0; i < nrealreaders; i++) {
|
||||
firsterr = torture_create_kthread(rcu_perf_reader, NULL,
|
||||
reader_tasks[i]);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
}
|
||||
while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders)
|
||||
schedule_timeout_uninterruptible(1);
|
||||
writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]),
|
||||
GFP_KERNEL);
|
||||
writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations),
|
||||
GFP_KERNEL);
|
||||
writer_n_durations =
|
||||
kcalloc(nrealwriters, sizeof(*writer_n_durations),
|
||||
GFP_KERNEL);
|
||||
if (!writer_tasks || !writer_durations || !writer_n_durations) {
|
||||
VERBOSE_PERFOUT_ERRSTRING("out of memory");
|
||||
firsterr = -ENOMEM;
|
||||
goto unwind;
|
||||
}
|
||||
for (i = 0; i < nrealwriters; i++) {
|
||||
writer_durations[i] =
|
||||
kcalloc(MAX_MEAS, sizeof(*writer_durations[i]),
|
||||
GFP_KERNEL);
|
||||
if (!writer_durations[i])
|
||||
goto unwind;
|
||||
firsterr = torture_create_kthread(rcu_perf_writer, (void *)i,
|
||||
writer_tasks[i]);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
}
|
||||
torture_init_end();
|
||||
return 0;
|
||||
|
||||
unwind:
|
||||
torture_init_end();
|
||||
rcu_perf_cleanup();
|
||||
return firsterr;
|
||||
}
|
||||
|
||||
module_init(rcu_perf_init);
|
||||
module_exit(rcu_perf_cleanup);
|
||||
@ -1289,6 +1289,39 @@ config TORTURE_TEST
|
||||
tristate
|
||||
default n
|
||||
|
||||
config RCU_PERF_TEST
|
||||
tristate "performance tests for RCU"
|
||||
depends on DEBUG_KERNEL
|
||||
select TORTURE_TEST
|
||||
select SRCU
|
||||
select TASKS_RCU
|
||||
default n
|
||||
help
|
||||
This option provides a kernel module that runs performance
|
||||
tests on the RCU infrastructure. The kernel module may be built
|
||||
after the fact on the running kernel to be tested, if desired.
|
||||
|
||||
Say Y here if you want RCU performance tests to be built into
|
||||
the kernel.
|
||||
Say M if you want the RCU performance tests to build as a module.
|
||||
Say N if you are unsure.
|
||||
|
||||
config RCU_PERF_TEST_RUNNABLE
|
||||
bool "performance tests for RCU runnable by default"
|
||||
depends on RCU_PERF_TEST = y
|
||||
default n
|
||||
help
|
||||
This option provides a way to build the RCU performance tests
|
||||
directly into the kernel without them starting up at boot time.
|
||||
You can use /sys/module to manually override this setting.
|
||||
This /proc file is available only when the RCU performance
|
||||
tests have been built into the kernel.
|
||||
|
||||
Say Y here if you want the RCU performance tests to start during
|
||||
boot (you probably don't).
|
||||
Say N here if you want the RCU performance tests to start only
|
||||
after being manually enabled via /sys/module.
|
||||
|
||||
config RCU_TORTURE_TEST
|
||||
tristate "torture tests for RCU"
|
||||
depends on DEBUG_KERNEL
|
||||
|
||||
Loading…
Reference in New Issue
Block a user