[Qemu-devel] [PATCH v3 00/11] simplify usage of tracepoints, and connect them to logging

["Denis V. Lunev" <den@openvz.org>]

This series does three things:

1) add a "-trace [enable=]foo" option to enable one or more trace
events, and a "-trace help" option to show the list of tracepoints
(patches 4-5)

2) change the stderr tracing backend so that it prints to the
-D log file, and enable it by default.  "-trace file=..." is
now a synonym of -D if the log backend is enabled (patches 7-8)

3) add a "-d trace:foo" option that is a synonym for "-trace foo";
this makes the new functionality more discoverable to people used
to "-d", makes it available for user-mode emulation (which does
not have -trace), and is somewhat nice if you want to enable both
tracepoints and some other "-d" flag (patch 9).  When globbing
it is also less susceptible to unwanted shell expansion.

For example, you can trace block device I/O and save the result
to a file just by adding "-trace bdrv_aio_*,file=trace.txt", or
correlate it to guest PCs with "-d exec,nochain,trace:bdrv_aio_*".

Opinions?  I would like to have this in 2.5 if there is agreement.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>

Changes from v2:
- compilation fix was extended to patch 2 and 3
- replaced Reviewed-by with Acked-by by request from Christian

Changes from v1:
- small cleanup to vl.c is added as patch (4)
- compilation is fixed in patch (2)
- moved qemu-log.c to util/log.c to fix linking of qemu-io/qemu-nbd

Denis V. Lunev (2):
  trace: no need to call trace_backend_init in different branches now
  log: move qemu-log.c into util/ directory

Paolo Bonzini (9):
  trace: fix documentation
  trace: split trace_init_events out of trace_init_backends
  trace: split trace_init_file out of trace_init_backends
  trace: add "-trace enable=..."
  trace: add "-trace help"
  log: do not unnecessarily include qom/cpu.h
  trace: convert stderr backend to log
  trace: switch default backend to "log"
  log: add "-d trace:PATTERN"

 Makefile.objs                                   |  1 -
 bsd-user/main.c                                 |  1 +
 configure                                       |  6 +-
 cpu-exec.c                                      |  1 +
 exec.c                                          |  1 +
 hw/acpi/cpu_hotplug.c                           |  1 +
 hw/timer/a9gtimer.c                             |  1 +
 include/exec/log.h                              | 60 ++++++++++++++++
 include/qemu/log.h                              | 60 +---------------
 linux-user/main.c                               |  1 +
 qemu-io.c                                       |  2 +-
 qemu-options.hx                                 | 22 ++++--
 qom/cpu.c                                       |  1 +
 scripts/tracetool/backend/{stderr.py => log.py} |  9 +--
 target-alpha/translate.c                        |  1 +
 target-arm/translate.c                          |  1 +
 target-cris/translate.c                         |  1 +
 target-i386/seg_helper.c                        |  1 +
 target-i386/smm_helper.c                        |  1 +
 target-i386/translate.c                         |  1 +
 target-lm32/helper.c                            |  1 +
 target-lm32/translate.c                         |  1 +
 target-m68k/translate.c                         |  1 +
 target-microblaze/helper.c                      |  1 +
 target-microblaze/translate.c                   |  1 +
 target-mips/helper.c                            |  1 +
 target-mips/translate.c                         |  1 +
 target-moxie/translate.c                        |  1 +
 target-openrisc/translate.c                     |  1 +
 target-ppc/mmu-hash32.c                         |  1 +
 target-ppc/mmu-hash64.c                         |  1 +
 target-ppc/mmu_helper.c                         |  1 +
 target-ppc/translate.c                          |  1 +
 target-s390x/translate.c                        |  1 +
 target-sh4/helper.c                             |  1 +
 target-sh4/translate.c                          |  1 +
 target-sparc/int32_helper.c                     |  1 +
 target-sparc/int64_helper.c                     |  1 +
 target-sparc/translate.c                        |  1 +
 target-tilegx/translate.c                       |  1 +
 target-tricore/translate.c                      |  1 +
 target-unicore32/translate.c                    |  1 +
 target-xtensa/translate.c                       |  1 +
 tcg/tcg.c                                       |  1 +
 trace/control.c                                 | 95 ++++++++++++++++++-------
 trace/control.h                                 | 42 ++++++++++-
 trace/simple.c                                  |  6 +-
 trace/simple.h                                  |  4 +-
 translate-all.c                                 |  1 +
 util/Makefile.objs                              |  1 +
 qemu-log.c => util/log.c                        | 19 ++++-
 vl.c                                            | 38 +++++-----
 52 files changed, 274 insertions(+), 129 deletions(-)
 create mode 100644 include/exec/log.h
 rename scripts/tracetool/backend/{stderr.py => log.py} (78%)
 rename qemu-log.c => util/log.c (90%)

-- 
2.1.4