perf tools: Merge deferred user callchains
Save samples with deferred callchains in a separate list and deliver
them after merging the user callchains. If users don't want to merge
they can set tool->merge_deferred_callchains to false to prevent the
behavior.
With previous result, now perf script will show the merged callchains.
$ perf script
perf 801 [000] 18.031793: 1 cycles:P:
ffffffff91a14c36 __intel_pmu_enable_all.isra.0+0x56 ([kernel.kallsyms])
ffffffff91d373e9 perf_ctx_enable+0x39 ([kernel.kallsyms])
ffffffff91d36af7 event_function+0xd7 ([kernel.kallsyms])
ffffffff91d34222 remote_function+0x42 ([kernel.kallsyms])
ffffffff91c1ebe1 generic_exec_single+0x61 ([kernel.kallsyms])
ffffffff91c1edac smp_call_function_single+0xec ([kernel.kallsyms])
ffffffff91d37a9d event_function_call+0x10d ([kernel.kallsyms])
ffffffff91d33557 perf_event_for_each_child+0x37 ([kernel.kallsyms])
ffffffff91d47324 _perf_ioctl+0x204 ([kernel.kallsyms])
ffffffff91d47c43 perf_ioctl+0x33 ([kernel.kallsyms])
ffffffff91e2f216 __x64_sys_ioctl+0x96 ([kernel.kallsyms])
ffffffff9265f1ae do_syscall_64+0x9e ([kernel.kallsyms])
ffffffff92800130 entry_SYSCALL_64+0xb0 ([kernel.kallsyms])
7fb5fc22034b __GI___ioctl+0x3b (/usr/lib/x86_64-linux-gnu/libc.so.6)
...
The old output can be get using --no-merge-callchain option.
Also perf report can get the user callchain entry at the end.
$ perf report --no-children --percent-limit=0 --stdio -q -S __intel_pmu_enable_all.isra.0
# symbol: __intel_pmu_enable_all.isra.0
0.00% perf [kernel.kallsyms]
|
---__intel_pmu_enable_all.isra.0
perf_ctx_enable
event_function
remote_function
generic_exec_single
smp_call_function_single
event_function_call
perf_event_for_each_child
_perf_ioctl
perf_ioctl
__x64_sys_ioctl
do_syscall_64
entry_SYSCALL_64
__GI___ioctl
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
9 files changed
