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

[Stefan Hajnoczi]

On Tue, Nov 03, 2015 at 02:39:05PM +0300, Denis V. Lunev wrote:
> On 10/29/2015 11:44 PM, Denis V. Lunev wrote:
> >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 <address@hidden>
> >Signed-off-by: Denis V. Lunev <address@hidden>
> >
> >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%)
> >
> Stefan,
> 
> It seems that I have missed you and other people except
> Paolo in v3 submission :( The difference is only compilation
> fix in patches 2/3.
> 
> My fault :(
> 
> Should I re-submit or you can take this and push them as
> negotiated before?

No need to re-submit, I will review v3.

Stefan

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