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Code Issues Releases Wiki Activity

rcuscale: Add RCU Tasks Trace

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This commit adds the ability to test performance and scalability of RCU
Tasks Trace updaters.

Reported-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-09-09 12:27:03 -07:00
parent 1ac78b49d6
commit 899f317e48
4 changed files with 50 additions and 1 deletions
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32
kernel/rcu/rcuscale.c
View file

@ -38,6 +38,7 @@
#include <asm/byteorder.h>
#include <linux/torture.h>
#include <linux/vmalloc.h>
#include <linux/rcupdate_trace.h>
#include "rcu.h"
@ -294,6 +295,35 @@ static struct rcu_scale_ops tasks_ops = {
.name = "tasks"
};
/*
* Definitions for RCU-tasks-trace scalability testing.
*/
static int tasks_trace_scale_read_lock(void)
{
rcu_read_lock_trace();
return 0;
}
static void tasks_trace_scale_read_unlock(int idx)
{
rcu_read_unlock_trace();
}
static struct rcu_scale_ops tasks_tracing_ops = {
.ptype = RCU_TASKS_FLAVOR,
.init = rcu_sync_scale_init,
.readlock = tasks_trace_scale_read_lock,
.readunlock = tasks_trace_scale_read_unlock,
.get_gp_seq = rcu_no_completed,
.gp_diff = rcu_seq_diff,
.async = call_rcu_tasks_trace,
.gp_barrier = rcu_barrier_tasks_trace,
.sync = synchronize_rcu_tasks_trace,
.exp_sync = synchronize_rcu_tasks_trace,
.name = "tasks-tracing"
};
static unsigned long rcuscale_seq_diff(unsigned long new, unsigned long old)
{
if (!cur_ops->gp_diff)
@ -754,7 +784,7 @@ rcu_scale_init(void)
long i;
int firsterr = 0;
static struct rcu_scale_ops *scale_ops[] = {
&rcu_ops, &srcu_ops, &srcud_ops, &tasks_ops,
&rcu_ops, &srcu_ops, &srcud_ops, &tasks_ops, &tasks_tracing_ops
};
if (!torture_init_begin(scale_type, verbose))

3
tools/testing/selftests/rcutorture/configs/rcuscale/CFcommon
View file

@ -1,2 +1,5 @@
CONFIG_RCU_SCALE_TEST=y
CONFIG_PRINTK_TIME=y
CONFIG_TASKS_RCU_GENERIC=y
CONFIG_TASKS_RCU=y
CONFIG_TASKS_TRACE_RCU=y

15
tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01 Normal file
View file

@ -0,0 +1,15 @@
CONFIG_SMP=y
CONFIG_PREEMPT_NONE=y
CONFIG_PREEMPT_VOLUNTARY=n
CONFIG_PREEMPT=n
CONFIG_HZ_PERIODIC=n
CONFIG_NO_HZ_IDLE=y
CONFIG_NO_HZ_FULL=n
CONFIG_RCU_FAST_NO_HZ=n
CONFIG_RCU_NOCB_CPU=n
CONFIG_DEBUG_LOCK_ALLOC=n
CONFIG_PROVE_LOCKING=n
CONFIG_RCU_BOOST=n
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
CONFIG_RCU_EXPERT=y
CONFIG_RCU_TRACE=y

1
tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01.boot Normal file
View file

@ -0,0 +1 @@
rcuscale.scale_type=tasks-tracing