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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/tools/perf/util
История
Namhyung Kim b837a8bdc4 perf tools: Fix build-id matching on vmlinux 
There's a problem on finding correct kernel symbols when perf report
runs on a different kernel.  Although a part of the problem was solved
by the prior commit 0a7e6d1b68 ("perf tools: Check recorded kernel
version when finding vmlinux"), there's a remaining problem still.

When perf records samples, it synthesizes the kernel map using
machine__mmap_name() and ref_reloc_sym like "[kernel.kallsyms]_text".
You can easily see it using 'perf report -D' command.

After finishing record, it goes through the recorded events to find
maps/dsos actually used.  And then record build-id info of them.

During this process, it needs to load symbols in a dso and it'd call
dso__load_vmlinux_path() since the default value of the symbol_conf.
try_vmlinux_path is true.  However it changes dso->long_name to a real
path of the vmlinux file (e.g. /lib/modules/3.16.4/build/vmlinux) if one
is running on a custom kernel.

It resulted in that perf report reads the build-id of the vmlinux, but
cannot use it since it only knows about the [kernel.kallsyms] map.  It
then falls back to possible vmlinux paths by using the recorded kernel
version (in case of a recent version) or a running kernel silently.

Even with the recent tools, this still has a possibility of breaking
the result.  As the build directory is a symbolic link, if one built a
new kernel in the same directory with different source/config, the old
link to vmlinux will point the new file.  So it's absolutely needed to
use build-id when finding a kernel image.

In this patch, it's now changed to try to search a kernel dso in the
existing dso list which was constructed during build-id table parsing
so it'll always have a build-id.  If not found, search "[kernel.kallsyms]".

Before:

  $ perf report
  # Children      Self  Command  Shared Object      Symbol
  # ........  ........  .......  .................  ...............................
  #
      72.15%     0.00%  swapper  [kernel.kallsyms]  [k] set_curr_task_rt
      72.15%     0.00%  swapper  [kernel.kallsyms]  [k] native_calibrate_tsc
      72.15%     0.00%  swapper  [kernel.kallsyms]  [k] tsc_refine_calibration_work
      71.87%    71.87%  swapper  [kernel.kallsyms]  [k] module_finalize
   ...

After (for the same perf.data):

      72.15%     0.00%  swapper  vmlinux  [k] cpu_startup_entry
      72.15%     0.00%  swapper  vmlinux  [k] arch_cpu_idle
      72.15%     0.00%  swapper  vmlinux  [k] default_idle
      71.87%    71.87%  swapper  vmlinux  [k] native_safe_halt
   ...

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/20140924073356.GB1962@gmail.com
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1415063674-17206-8-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2014-11-05 10:14:08 -03:00
..
include Revert "perf tools: Default to cpu// for events v5" 2014-10-15 16:04:33 -03:00
scripting-engines perf tools: Defer export of comms that were not 'set' 2014-11-03 18:11:59 -03:00
PERF-VERSION-GEN perf tools: Fix version when building out of tree 2013-11-07 10:40:47 -03:00
abspath.c
…
alias.c perf tools: Introduce zfree 2013-12-27 15:17:00 -03:00
annotate.c perf symbols: Make sym->end be the first address after the symbol range 2014-10-14 17:50:58 -03:00
annotate.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
bitmap.c
…
build-id.c perf build-id: Move build-id related functions to util/build-id.c 2014-11-05 10:14:07 -03:00
build-id.h perf build-id: Move build-id related functions to util/build-id.c 2014-11-05 10:14:07 -03:00
cache.h perf tools: Add perf_config_u64 function 2014-08-12 12:03:00 -03:00
callchain.c perf thread: Adopt resolve_callchain method from machine 2014-10-29 10:32:46 -02:00
callchain.h perf tools: A thread's machine can be found via thread->mg->machine 2014-10-29 10:32:46 -02:00
cgroup.c perf evlist: Introduce evlist__for_each() & friends 2014-01-13 10:06:25 -03:00
cgroup.h
…
cloexec.c perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
cloexec.h perf tools: Enable close-on-exec flag on perf file descriptor 2014-07-18 09:09:34 +02:00
color.c perf tools: Make __hpp__fmt() receive an additional len argument 2014-08-12 12:03:05 -03:00
color.h perf tools: Make __hpp__fmt() receive an additional len argument 2014-08-12 12:03:05 -03:00
comm.c perf tools: Identify which comms are from exec 2014-08-13 19:23:08 -03:00
comm.h perf tools: Add facility to export data in database-friendly way 2014-10-29 10:32:49 -02:00
config.c perf tools: Fix line number in the config file error message 2014-09-26 12:45:23 -03:00
cpumap.c perf tools: Use cpu/possible instead of cpu/kernel_max 2014-04-22 17:39:16 +02:00
cpumap.h perf tools: Allow ability to map cpus to nodes easily 2014-04-22 17:39:12 +02:00
ctype.c
…
data.c perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
data.h perf tools: Add perf_data_file__write interface 2013-12-02 09:22:46 -03:00
db-export.c perf tools: Defer export of comms that were not 'set' 2014-11-03 18:11:59 -03:00
db-export.h perf tools: Defer export of comms that were not 'set' 2014-11-03 18:11:59 -03:00
debug.c perf tools: Add debug prints for ordered events queue 2014-08-12 12:03:01 -03:00
debug.h perf: Use strerror_r instead of strerror 2014-08-15 10:54:29 -03:00
dso.c perf tools: Add gzip decompression support for kernel module 2014-11-05 10:11:26 -03:00
dso.h perf symbols: Preparation for compressed kernel module support 2014-11-04 10:15:53 -03:00
dwarf-aux.c perf probe: Fix perf probe to find correct variable DIE 2014-06-04 14:49:20 +02:00
dwarf-aux.h perf probe: Fix to find line information for probe list 2013-10-04 15:16:05 -03:00
environment.c
…
event.c perf tools: Add id index 2014-10-29 11:24:47 -02:00
event.h perf tools: Add a thread stack for synthesizing call chains 2014-11-03 17:10:59 -03:00
evlist.c perf tools: Use evlist__for_each in a few remaining places 2014-10-29 11:31:54 -02:00
evlist.h perf evlist: Add missing 'struct option' forward declaration 2014-10-17 12:16:00 -03:00
evsel.c perf evsel: No need to drag util/cgroup.h 2014-10-17 12:17:40 -03:00
evsel.h perf tools: Add id index 2014-10-29 11:24:47 -02:00
exec_cmd.c
…
exec_cmd.h
…
find-vdso-map.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
generate-cmdlist.sh tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
header.c perf tools: Fix build-id matching on vmlinux 2014-11-05 10:14:08 -03:00
header.h perf build-id: Move build-id related functions to util/build-id.c 2014-11-05 10:14:07 -03:00
help.c perf tools: Use zfree to help detect use after free bugs 2013-12-27 17:08:19 -03:00
help.h
…
hist.c perf tools: Remove hists from evsel 2014-10-14 17:32:52 -03:00
hist.h perf tools: Remove hists from evsel 2014-10-14 17:32:52 -03:00
hweight.c
…
intlist.c perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
intlist.h perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
kvm-stat.h perf kvm stat report: Save pid string in opts.target.pid 2014-09-17 17:08:07 -03:00
levenshtein.c
…
levenshtein.h
…
machine.c perf tools: Fix build-id matching on vmlinux 2014-11-05 10:14:08 -03:00
machine.h perf tools: Add facility to export data in database-friendly way 2014-10-29 10:32:49 -02:00
map.c perf tools: Set thread->mg.machine in all places 2014-10-29 10:32:46 -02:00
map.h perf tools: Set thread->mg.machine in all places 2014-10-29 10:32:46 -02:00
ordered-events.c perf session: Add option to copy events when queueing 2014-10-15 17:39:03 -03:00
ordered-events.h perf session: Add option to copy events when queueing 2014-10-15 17:39:03 -03:00
pager.c perf tools: Add cat as fallback pager 2014-05-21 11:48:33 +02:00
parse-events.c perf tools: Parse the pmu event prefix and suffix 2014-10-15 16:05:01 -03:00
parse-events.h perf tools: Parse the pmu event prefix and suffix 2014-10-15 16:05:01 -03:00
parse-events.l perf tools: Add support to new style format of kernel PMU event 2014-10-15 16:05:45 -03:00
parse-events.y perf tools: Add support to new style format of kernel PMU event 2014-10-15 16:05:45 -03:00
parse-options.c perf tools: Add support for exclusive option 2014-10-29 10:32:47 -02:00
parse-options.h perf tools: Add support for exclusive option 2014-10-29 10:32:47 -02:00
path.c tools/perf: Turn strlcpy() into a __weak function 2013-10-09 08:48:49 +02:00
perf_regs.c perf tools: Cache register accesses for unwind processing 2014-06-12 16:53:19 +02:00
perf_regs.h perf tools: Cache register accesses for unwind processing 2014-06-12 16:53:19 +02:00
pmu.c perf pmu: Add proper error handling to print_pmu_events() 2014-10-29 10:32:48 -02:00
pmu.h perf pmu: Let pmu's with no events show up on perf list 2014-10-29 10:32:48 -02:00
pmu.l
…
pmu.y perf tools: Fix build with bison 2.3 and older. 2013-02-14 16:12:34 -03:00
probe-event.c perf probe: Add --quiet option to suppress output result message 2014-10-29 10:32:49 -02:00
probe-event.h perf probe: Do not access kallsyms when analyzing user binaries 2014-09-17 18:01:14 -03:00
probe-finder.c perf probe: Do not use dwfl_module_addrsym if dwarf_diename finds symbol name 2014-09-17 18:01:43 -03:00
probe-finder.h perf probe: Support distro-style debuginfo for uprobe 2014-02-18 09:38:44 -03:00
pstack.c perf tools: Move pr_* debug macros into debug object 2014-07-17 12:58:39 -03:00
pstack.h perf tools: Finish the removal of 'self' arguments 2013-11-05 15:32:36 -03:00
python-ext-sources perf tools: Move fs.* to lib/api/fs/ 2014-02-18 09:34:49 -03:00
python.c tools lib api: Adopt fdarray class from perf's evlist 2014-09-25 16:46:55 -03:00
quote.c
…
quote.h
…
rblist.c perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
rblist.h perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
record.c perf evlist: Add perf_evlist__set_tracking_event() 2014-08-13 19:21:32 -03:00
run-command.c perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
run-command.h
…
session.c perf session: Add perf_session__deliver_synth_event() 2014-10-29 11:36:15 -02:00
session.h perf session: Add perf_session__deliver_synth_event() 2014-10-29 11:36:15 -02:00
setup.py tools/: Convert to new topic libraries 2013-12-16 16:03:27 -03:00
sigchain.c
…
sigchain.h
…
sort.c perf tools: Fix report -F dso_from for data without branch info 2014-10-29 10:29:05 -02:00
sort.h perf tools: Add +field argument support for --field option 2014-08-24 08:11:19 -03:00
srcline.c perf tools: Fix build error due to zfree() cast 2014-01-15 15:10:04 -03:00
stat.c perf stats: Add max and min stats 2013-08-07 17:35:26 -03:00
stat.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
strbuf.c perf tools: Use zfree to help detect use after free bugs 2013-12-27 17:08:19 -03:00
strbuf.h
…
strfilter.c perf tools: Use zfree to help detect use after free bugs 2013-12-27 17:08:19 -03:00
strfilter.h perf tools: Finish the removal of 'self' arguments 2013-11-05 15:32:36 -03:00
string.c Revert "perf tools: Default to cpu// for events v5" 2014-10-15 16:04:33 -03:00
strlist.c perf tools: Fix build error due to zfree() cast 2014-01-15 15:10:04 -03:00
strlist.h perf tools: Stop using 'self' in strlist 2013-01-25 12:49:28 -03:00
svghelper.c perf timechart: Implement IO mode 2014-07-10 00:22:54 +02:00
svghelper.h perf timechart: Implement IO mode 2014-07-10 00:22:54 +02:00
symbol-elf.c perf symbols: Preparation for compressed kernel module support 2014-11-04 10:15:53 -03:00
symbol-minimal.c perf tools: Add dso__type() 2014-07-23 17:36:36 -03:00
symbol.c perf record: Do not save pathname in ./debug/.build-id directory for vmlinux 2014-11-05 10:14:08 -03:00
symbol.h perf record: Do not save pathname in ./debug/.build-id directory for vmlinux 2014-11-05 10:14:08 -03:00
target.c perf record: Make per-cpu mmaps the default. 2013-11-27 14:58:36 -03:00
target.h perf target: Move the checking of which map function to call into function. 2013-12-04 13:46:37 -03:00
thread-stack.c perf tools: Enhance the thread stack to output call/return data 2014-11-03 17:43:56 -03:00
thread-stack.h perf tools: Enhance the thread stack to output call/return data 2014-11-03 17:43:56 -03:00
thread.c perf tools: Add a thread stack for synthesizing call chains 2014-11-03 17:10:59 -03:00
thread.h perf tools: Add a thread stack for synthesizing call chains 2014-11-03 17:10:59 -03:00
thread_map.c perf thread_map: Create dummy constructor out of open coded equivalent 2014-10-14 17:32:52 -03:00
thread_map.h perf thread_map: Create dummy constructor out of open coded equivalent 2014-10-14 17:32:52 -03:00
tool.h perf tools: Add id index 2014-10-29 11:24:47 -02:00
top.c perf tools: Rename 'perf_record_opts' to 'record_opts 2013-12-19 14:43:45 -03:00
top.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
trace-event-info.c perf tools: Move pr_* debug macros into debug object 2014-07-17 12:58:39 -03:00
trace-event-parse.c perf tools: Fix memory leak in event_format__print function 2014-02-18 09:34:47 -03:00
trace-event-read.c perf tools: Remove needless getopt.h includes 2014-07-17 12:59:00 -03:00
trace-event-scripting.c perf scripting: Add 'flush' callback to scripting API 2014-08-22 13:12:11 -03:00
trace-event.c tools lib traceevent: Make plugin unload function receive pevent 2014-01-15 15:10:40 -03:00
trace-event.h perf scripting: Add 'flush' callback to scripting API 2014-08-22 13:12:11 -03:00
tsc.c perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
tsc.h perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
unwind-libdw.c perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
unwind-libdw.h perf tools: Add libdw DWARF post unwind support 2014-02-24 09:29:36 -03:00
unwind-libunwind.c perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
unwind.h perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
usage.c
…
util.c perf callchain: Move callchain_param to util object in to fix python test 2014-10-03 09:39:48 -03:00
util.h perf tools: Add gzip decompression support for kernel module 2014-11-05 10:11:26 -03:00
values.c perf tools: Use zfree to help detect use after free bugs 2013-12-27 17:08:19 -03:00
values.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
vdso.c perf tools: Do not attempt to run perf-read-vdso32 if it wasn't built 2014-10-29 10:32:48 -02:00
vdso.h perf tools: Add support for 32-bit compatibility VDSOs 2014-10-29 10:32:48 -02:00
wrapper.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
xyarray.c
…
xyarray.h
…
zlib.c perf tools: Add gzip decompression support for kernel module 2014-11-05 10:11:26 -03:00