Commit 4c42f5f0 authored by Tero Kristo's avatar Tero Kristo Committed by Steven Rostedt (Google)
Browse files

trace/hwlat: Do not wipe the contents of per-cpu thread data 

Do not wipe the contents of the per-cpu kthread data when starting the
tracer, as this will completely forget about already running instances
and can later start new additional per-cpu threads.

Link: https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@linux.intel.com/
Link: https://lkml.kernel.org/r/20230310100451.3948583-2-tero.kristo@linux.intel.com



Cc: stable@vger.kernel.org
Fixes: f46b1652 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: default avatarTero Kristo <tero.kristo@linux.intel.com>
Acked-by: default avatarDaniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 7a025e06

kernel/trace/trace_hwlat.c

+0 −3
Original line number Diff line number Diff line
@@ -584,9 +584,6 @@ static int start_per_cpu_kthreads(struct trace_array *tr) 
	 */

	cpumask_and(current_mask, cpu_online_mask, tr->tracing_cpumask);



	for_each_online_cpu(cpu)

		per_cpu(hwlat_per_cpu_data, cpu).kthread = NULL;



	for_each_cpu(cpu, current_mask) {

		retval = start_cpu_kthread(cpu);

		if (retval)