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It was reported to me that the thread created by the hwlat tracer does 

not migrate after the first instance. I found that there was as small
 bug in the logic, and fixed it. It's minor, but should be fixed regardless.
 There's not much impact outside the hwlat tracer.
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Merge tag 'trace-4.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "It was reported to me that the thread created by the hwlat tracer does
  not migrate after the first instance. I found that there was as small
  bug in the logic, and fixed it. It's minor, but should be fixed
  regardless. There's not much impact outside the hwlat tracer"

* tag 'trace-4.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix hwlat kthread migration
This commit is contained in:
Linus Torvalds 2017-01-31 16:32:40 -08:00
parent 283725af0b 79c6f448c8
commit a2ca3d6179
1 changed files with 5 additions and 3 deletions
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8
kernel/trace/trace_hwlat.c
View File

@ -266,7 +266,7 @@ static int get_sample(void)
static struct cpumask save_cpumask; static struct cpumask save_cpumask;
static bool disable_migrate; static bool disable_migrate;
static void move_to_next_cpu(void) static void move_to_next_cpu(bool initmask)
{ {
static struct cpumask *current_mask; static struct cpumask *current_mask;
int next_cpu; int next_cpu;
@ -275,7 +275,7 @@ static void move_to_next_cpu(void)
return; return;
/* Just pick the first CPU on first iteration */ /* Just pick the first CPU on first iteration */
if (!current_mask) { if (initmask) {
current_mask = &save_cpumask; current_mask = &save_cpumask;
get_online_cpus(); get_online_cpus();
cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask); cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask);
@ -330,10 +330,12 @@ static void move_to_next_cpu(void)
static int kthread_fn(void *data) static int kthread_fn(void *data)
{ {
u64 interval; u64 interval;
bool initmask = true;
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
move_to_next_cpu(); move_to_next_cpu(initmask);
initmask = false;
local_irq_disable(); local_irq_disable();
get_sample(); get_sample();