Commit 899f317e authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcuscale: Add RCU Tasks Trace 



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

Reported-by: default avatarAlexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 1ac78b49

kernel/rcu/rcuscale.c

+31 −1
Original line number Diff line number Diff line
@@ -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))

tools/testing/selftests/rcutorture/configs/rcuscale/CFcommon

+3 −0
Original line number Diff line number Diff line 
CONFIG_RCU_SCALE_TEST=y

CONFIG_PRINTK_TIME=y

CONFIG_TASKS_RCU_GENERIC=y

CONFIG_TASKS_RCU=y

CONFIG_TASKS_TRACE_RCU=y

tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01

0 → 100644
+15 −0
Original line number Diff line number Diff line 
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

tools/testing/selftests/rcutorture/configs/rcuscale/TRACE01.boot

0 → 100644
+1 −0
Original line number Diff line number Diff line 
rcuscale.scale_type=tasks-tracing