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| author | Tero Kristo <tero.kristo@linux.intel.com> | 2023-03-10 12:04:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 13:34:04 +0100 |
| commit | a78eab86e2a88683f92a7d0ddb79a9e00ea15359 (patch) | |
| tree | 7d6a4206cf9032116b8bd208e30a9bc3f40d6f66 | |
| parent | 15f6110abd278868cf922fafd181e2c4e9f98446 (diff) | |
| download | linux-a78eab86e2a88683f92a7d0ddb79a9e00ea15359.tar.gz linux-a78eab86e2a88683f92a7d0ddb79a9e00ea15359.tar.bz2 linux-a78eab86e2a88683f92a7d0ddb79a9e00ea15359.zip | |
trace/hwlat: Do not wipe the contents of per-cpu thread data
commit 4c42f5f0d1dd20bddd9f940beb1e6ccad60c4498 upstream.
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: f46b16520a087 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/trace/trace_hwlat.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index d440ddd5fd8b..edc26dc22c3f 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -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) |