Re: [PATCH v5 10/11] trace: add trace_performance facility to debug performance issues

Karsten Blees [off-list ref] writes:

Right, it makes no sense for trace_performance(), and for
trace_performance_since() only if followed by another 'measured' code
section. In that special case, I think it wouldn't hurt if you had to
write:

  uint64_t start = getnanotime();
  /* first code section to measure */
  trace_performance_since(start, "first foobar");

  start = getnanotime();
  /* second code section to measure */
  trace_performance_since(start, "second foobar");

So I guess I'll drop the return value (and the second example, which
is then redundant to the first).

That also sounds OK to me.

quoted

quoted

+static void trace_performance_vfl(const char *file, int line,
+				      uint64_t nanos, const char *format,
+				      va_list ap)
+{

Just being curious, but what does "v" stand for?

trace_performance_vfl(, va_list)
vs.
trace_performance_fl(, ...)

Will change to trace_performance_vprintf_fl()

Ah, OK.  The name with 'vprintf' in it does sound better.

Thanks.

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