Some minor things that I will rework in next rev after spending some
more time on it:
On Sat, Jun 3, 2017 at 9:03 PM, Joel Fernandes <joelaf@xxxxxxxxxx> wrote:
[..]
> @@ -463,7 +469,7 @@ int trace_set_clr_event(const char *system, const char *event, int set);
> #define event_trace_printk(ip, fmt, args...) \
> do { \
> __trace_printk_check_format(fmt, ##args); \
> - tracing_record_cmdline(current); \
> + tracing_record_taskinfo_single(current, true, false); \
> if (__builtin_constant_p(fmt)) { \
> static const char *trace_printk_fmt \
> __attribute__((section("__trace_printk_fmt"))) = \
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index 193c5f5e3f79..d7394cdf899e 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -236,7 +236,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
> cpu = raw_smp_processor_id();
>
> if (blk_tracer) {
> - tracing_record_cmdline(current);
> + tracing_record_taskinfo_single(current, true, false);
I think I will try to preserve the existing API so that existing users
aren't bothered much.
>
> buffer = blk_tr->trace_buffer.buffer;
> pc = preempt_count();
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 63deff9cdf2c..7be21ae4f0a8 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -87,7 +87,7 @@ dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
> * tracing is active, only save the comm when a trace event
> * occurred.
> */
> -static DEFINE_PER_CPU(bool, trace_cmdline_save);
> +static DEFINE_PER_CPU(bool, trace_taskinfo_save);
>
> /*
> * Kill all tracing for good (never come back).
> @@ -790,7 +790,7 @@ EXPORT_SYMBOL_GPL(tracing_on);
> static __always_inline void
> __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event)
> {
> - __this_cpu_write(trace_cmdline_save, true);
> + __this_cpu_write(trace_taskinfo_save, true);
>
> /* If this is the temp buffer, we need to commit fully */
> if (this_cpu_read(trace_buffered_event) == event) {
> @@ -1709,6 +1709,15 @@ void tracing_reset_all_online_cpus(void)
> }
> }
>
> +static unsigned int *tgid_map;
> +
> +void tracing_alloc_tgid_map(void)
> +{
> + tgid_map = kzalloc((PID_MAX_DEFAULT + 1) * sizeof(*tgid_map),
> + GFP_KERNEL);
> + WARN_ONCE(!tgid_map, "Allocation of tgid_map failed\n");
I should check if tgid_map is already allocated or there's a chance of
re-allocating.
Looking forward to any other comments...
thanks,
-Joel
