tracing: erase irqsoff trace with empty write
PATCH v2 1/1 tracing: erase irqsoff trace with empty write
One convenient way to erase trace is "echo > trace". However, this is currently broken if the current tracer is irqsoff tracer. This is because irqsoff tracer use max_buffer as the default trace buffer.
Set the max_buffer as the one to be cleared when it's the trace buffer currently in use.
Signed-off-by Bo Yan <[email protected]>
---
Changes in v2: rename tr_buf to trace_buf
kernel/trace/trace.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
kernel/trace/trace.c +8 -2
@@ -4020,11 +4020,17 @@ static int tracing_open(struct inode *inode, struct file *file)/* If this file was open for write, then erase contents */ if ((file->f_mode &FMODE_WRITE ) && (file->f_flags &O_TRUNC )) {int cpu =tracing_get_cpu (inode); +struct trace_buffer *trace_buf = &tr->trace_buffer; + +#ifdef CONFIG_TRACER_MAX_TRACE +if (tr->current_trace->print_max) + trace_buf = &tr->max_buffer; +#endif if (cpu ==RING_BUFFER_ALL_CPUS ) -tracing_reset_online_cpus (&tr->trace_buffer); +tracing_reset_online_cpus (trace_buf);else -tracing_reset (&tr->trace_buffer, cpu); +tracing_reset (trace_buf, cpu); }if (file->f_mode &FMODE_READ ) {
Signature · 1 line
2.7.4