[PATCH 0/3] perf/x86/intel/pt: Fix stop/start with no update

[Adrian Hunter]

Hi

Here is a fix for Intel PT.

There are 2 preparatory patches with no functional change intended.

The fix is to prevent nesting of perf_aux_output_begin() which
triggers the WARNING in perf_aux_output_begin():

	nest = READ_ONCE(rb->aux_nest);
	/*
	 * Nesting is not supported for AUX area, make sure nested
	 * writers are caught early
	 */
	if (WARN_ON_ONCE(nest))
		goto err_put;

The nesting happens when Intel PT gets throttled.  See the patch for more
details.


Adrian Hunter (3):
      perf/x86/intel/pt: Factor out pt_config_enable()
      perf/x86/intel/pt: Use bitwise access for PERF_HES_STOPPED
      perf/x86/intel/pt: Fix stop/start with no update

 arch/x86/events/intel/pt.c | 96 +++++++++++++++++++++++++++++++---------------
 1 file changed, 65 insertions(+), 31 deletions(-)


Regards
Adrian