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trace/hwlat: Support hotplug operations

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Enable and disable hwlat thread during cpu hotplug online
and offline operations, respectivelly.

Link: https://lore.kernel.org/linux-doc/20210621134636.5b332226@oasis.local.home/
Link: https://lkml.kernel.org/r/52012d25ea35491a0f8088b947864d8df8e25157.1624372313.git.bristot@redhat.com

Cc: Phil Auld <pauld@redhat.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Kate Carcia <kcarcia@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
Cc: Clark Willaims <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2021-06-22 16:42:31 +02:00 committed by Steven Rostedt (VMware)
parent 039a602db3
commit ba998f7d95
1 changed files with 65 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
kernel/trace/trace_hwlat.c
View File

@ -466,6 +466,7 @@ static void stop_cpu_kthread(unsigned int cpu)
kthread = per_cpu(hwlat_per_cpu_data, cpu).kthread;
if (kthread)
kthread_stop(kthread);
per_cpu(hwlat_per_cpu_data, cpu).kthread = NULL;
}
/*
@ -506,6 +507,68 @@ static int start_cpu_kthread(unsigned int cpu)
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
static void hwlat_hotplug_workfn(struct work_struct *dummy)
{
struct trace_array *tr = hwlat_trace;
unsigned int cpu = smp_processor_id();
mutex_lock(&trace_types_lock);
mutex_lock(&hwlat_data.lock);
get_online_cpus();
if (!hwlat_busy || hwlat_data.thread_mode != MODE_PER_CPU)
goto out_unlock;
if (!cpumask_test_cpu(cpu, tr->tracing_cpumask))
goto out_unlock;
start_cpu_kthread(cpu);
out_unlock:
put_online_cpus();
mutex_unlock(&hwlat_data.lock);
mutex_unlock(&trace_types_lock);
}
static DECLARE_WORK(hwlat_hotplug_work, hwlat_hotplug_workfn);
/*
* hwlat_cpu_init - CPU hotplug online callback function
*/
static int hwlat_cpu_init(unsigned int cpu)
{
schedule_work_on(cpu, &hwlat_hotplug_work);
return 0;
}
/*
* hwlat_cpu_die - CPU hotplug offline callback function
*/
static int hwlat_cpu_die(unsigned int cpu)
{
stop_cpu_kthread(cpu);
return 0;
}
static void hwlat_init_hotplug_support(void)
{
int ret;
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "trace/hwlat:online",
hwlat_cpu_init, hwlat_cpu_die);
if (ret < 0)
pr_warn(BANNER "Error to init cpu hotplug support\n");
return;
}
#else /* CONFIG_HOTPLUG_CPU */
static void hwlat_init_hotplug_support(void)
{
return;
}
#endif /* CONFIG_HOTPLUG_CPU */
/*
* start_per_cpu_kthreads - Kick off the hardware latency sampling/detector kthreads
*
@ -822,6 +885,8 @@ __init static int init_hwlat_tracer(void)
if (ret)
return ret;
hwlat_init_hotplug_support();
init_tracefs();
return 0;