[Qemu-devel] [PATCH for-2.5 0/2] trace: decrease overhead of simpletrace and stderr backends

[Paolo Bonzini]

This patch series makes it faster for simpletrace and stderr backends
to discard disabled events.  This is done in two ways: patch 1 makes
the common case of no enabled events faster; patch 2 makes the other
case less heavy on the data cache by packing the "tracepoint enabled"
flag and avoiding useless pointer chasing.

This should decrease the impact of changing the default tracing backend
to stderr aka log, which Peter suggested could be a problem.

Paolo

Paolo Bonzini (2):
  trace: count number of enabled events
  trace: track enabled events in a separate array

 scripts/tracetool/format/events_c.py |  2 +-
 trace/control-internal.h             | 15 ++++++++++++---
 trace/control.c                      |  3 +++
 trace/control.h                      |  2 +-
 trace/event-internal.h               |  2 --
 5 files changed, 17 insertions(+), 7 deletions(-)

-- 
2.5.0