Commits
Alexey Budankov committed 10ccbc1cc0b
perf report: Prefer DWARF callstacks to LBR ones when captured both
Display DWARF based callchains when the perf.data file contains raw thread
stack data as LBR callstack data.
Commiter testing:
This changes the output from the branch stack based one, i.e. without
this patch, for the same file as in the previous csets:
# perf report --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
# Total Lost Samples: 0
#
# Samples: 13 of event 'cycles'
# Event count (approx.): 13
#
# Overhead Command Source Shared Object Source Symbol Target Symbol Basic Block Cycles
# ........ ....... .................... ........................... ......................................... ..................
#
7.69% ls libpthread-2.29.so [.] _init [.] __pthread_initialize_minimal_internal 6827
7.69% ls ld-2.29.so [k] _start [k] _dl_start -
7.69% ls ld-2.29.so [.] _dl_start_user [.] _dl_init -24790
7.69% ls ld-2.29.so [k] _dl_start [k] _dl_sysdep_start 278
7.69% ls ld-2.29.so [k] dl_main [k] _dl_map_object_deps 15581
7.69% ls ld-2.29.so [k] open_verify.constprop.0 [k] lseek64 4228
7.69% ls ld-2.29.so [k] _dl_map_object [k] open_verify.constprop.0 55
7.69% ls ld-2.29.so [k] openaux [k] _dl_map_object 67
7.69% ls ld-2.29.so [k] _dl_map_object_deps [k] 0x00007f441b57c090 112
7.69% ls ld-2.29.so [.] call_init.part.0 [.] _init 334
7.69% ls ld-2.29.so [.] _dl_init [.] call_init.part.0 383
7.69% ls ld-2.29.so [k] _dl_sysdep_start [k] dl_main 45
7.69% ls ld-2.29.so [k] _dl_catch_exception [k] openaux 116
#
# (Tip: For memory address profiling, try: perf mem record / perf mem report)
#
To the one that shows call chains:
# perf report --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 10 of event 'cycles'
# Event count (approx.): 3204047
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... .................. .........................................
#
55.01% 0.00% ls [kernel.vmlinux] [k] entry_SYSCALL_64_after_hwframe
|
---entry_SYSCALL_64_after_hwframe
do_syscall_64
|
--16.01%--__x64_sys_execve
__do_execve_file.isra.0
search_binary_handler
load_elf_binary
elf_map
vm_mmap_pgoff
do_mmap
mmap_region
perf_event_mmap
perf_iterate_sb
perf_iterate_ctx
perf_event_mmap_output
perf_output_copy
memcpy_erms
55.01% 39.00% ls [kernel.vmlinux] [k] do_syscall_64
|
|--39.00%--0xffffffffffffffff
| _dl_map_object
| open_verify.constprop.0
| __lseek64 (inlined)
| entry_SYSCALL_64_after_hwframe
| do_syscall_64
|
--16.01%--do_syscall_64
__x64_sys_execve
__do_execve_file.isra.0
search_binary_handler
load_elf_binary
elf_map
vm_mmap_pgoff
do_mmap
mmap_region
perf_event_mmap
perf_iterate_sb
perf_iterate_ctx
perf_event_mmap_output
perf_output_copy
memcpy_erms
42.95% 42.95% ls libpthread-2.29.so [.] __pthread_initialize_minimal_internal
|
---_init
__pthread_initialize_minimal_internal
42.95% 0.00% ls libpthread-2.29.so [.] _init
|
---_init
__pthread_initialize_minimal_internal
<SNIP>
#
# (Tip: Profiling branch (mis)predictions with: perf record -b / perf report)
#
#
The branch stack view be explicitely selected using:
# perf report -h branch-stack
Usage: perf report [<options>]
-b, --branch-stack use branch records for per branch histogram filling
#
I.e. after this patch:
# perf report -b --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 13 of event 'cycles'
# Event count (approx.): 13
#
# Overhead Command Source Shared Object Source Symbol Target Symbol Basic Block Cycles
# ........ ....... .................... ........................... ......................................... ..................
#
7.69% ls libpthread-2.29.so [.] _init [.] __pthread_initialize_minimal_internal 6827
7.69% ls ld-2.29.so [k] _start [k] _dl_start -
7.69% ls ld-2.29.so [.] _dl_start_user [.] _dl_init -24790
7.69% ls ld-2.29.so [k] _dl_start [k] _dl_sysdep_start 278
7.69% ls ld-2.29.so [k] dl_main [k] _dl_map_object_deps 15581
7.69% ls ld-2.29.so [k] open_verify.constprop.0 [k] lseek64 4228
7.69% ls ld-2.29.so [k] _dl_map_object [k] open_verify.constprop.0 55
7.69% ls ld-2.29.so [k] openaux [k] _dl_map_object 67
7.69% ls ld-2.29.so [k] _dl_map_object_deps [k] 0x00007f441b57c090 112
7.69% ls ld-2.29.so [.] call_init.part.0 [.] _init 334
7.69% ls ld-2.29.so [.] _dl_init [.] call_init.part.0 383
7.69% ls ld-2.29.so [k] _dl_sysdep_start [k] dl_main 45
7.69% ls ld-2.29.so [k] _dl_catch_exception [k] openaux 116
#
# (Tip: Show current config key-value pairs: perf config --list)
#
#
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/ccbd9583-82f4-dec5-7e84-64bf56e351fb@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>