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$ perf record -b ./div
$ perf record -b ./div
Following is the default perf diff output
$ perf diff
# Event 'cycles'
#
# Baseline Delta Abs Shared Object Symbol
# ........ ......... ................ ..................................
#
48.75% +0.33% div [.] main
8.21% -0.20% div [.] compute_flag
19.02% -0.12% libc-2.23.so [.] __random_r
16.17% -0.09% libc-2.23.so [.] __random
2.27% -0.03% div [.] rand@plt
+0.02% [i915] [k] gen8_irq_handler
5.52% +0.02% libc-2.23.so [.] rand
This patch creates a new computation selection 'cycles'.
$ perf diff -c cycles
# Event 'cycles'
#
# Baseline [Program Block Range] Cycles Diff Shared Object Symbol
# ........ ....................................... .........................................
#
48.75% [div.c:42 -> div.c:45] 147 div [.] main
48.75% [div.c:31 -> div.c:40] 4 div [.] main
48.75% [div.c:40 -> div.c:40] 0 div [.] main
48.75% [div.c:42 -> div.c:42] 0 div [.] main
48.75% [div.c:42 -> div.c:44] 0 div [.] main
19.02% [random_r.c:357 -> random_r.c:360] 0 libc-2.23.so [.] __random_r
19.02% [random_r.c:357 -> random_r.c:373] 0 libc-2.23.so [.] __random_r
19.02% [random_r.c:357 -> random_r.c:376] 0 libc-2.23.so [.] __random_r
19.02% [random_r.c:357 -> random_r.c:380] 0 libc-2.23.so [.] __random_r
19.02% [random_r.c:357 -> random_r.c:392] 0 libc-2.23.so [.] __random_r
16.17% [random.c:288 -> random.c:291] 0 libc-2.23.so [.] __random
16.17% [random.c:288 -> random.c:291] 0 libc-2.23.so [.] __random
16.17% [random.c:288 -> random.c:295] 0 libc-2.23.so [.] __random
16.17% [random.c:288 -> random.c:297] 0 libc-2.23.so [.] __random
16.17% [random.c:291 -> random.c:291] 0 libc-2.23.so [.] __random
16.17% [random.c:293 -> random.c:293] 0 libc-2.23.so [.] __random
8.21% [div.c:22 -> div.c:22] 148 div [.] compute_flag
8.21% [div.c:22 -> div.c:25] 0 div [.] compute_flag
8.21% [div.c:27 -> div.c:28] 0 div [.] compute_flag
5.52% [rand.c:26 -> rand.c:27] 0 libc-2.23.so [.] rand
5.52% [rand.c:26 -> rand.c:28] 0 libc-2.23.so [.] rand
2.27% [rand@plt+0 -> rand@plt+0] 0 div [.] rand@plt
0.01% [entry_64.S:694 -> entry_64.S:694] 16 [vmlinux] [k] native_irq_return_iret
0.00% [fair.c:7676 -> fair.c:7665] 162 [vmlinux] [k] update_blocked_averages
"[Program Block Range]" indicates the range of program basic block
(start -> end). If we can find the source line it prints the source line
otherwise it prints the symbol+offset instead.
v4:
---
Use source lines or symbol+offset to indicate the basic block. It should
be easier to understand.
v3:
---
Cast 'struct hist_entry' to 'struct block_hist' in hist_entry__block_fprintf.
Use symbol_conf.report_block to check if executing hist_entry__block_fprintf.
v2:
---
Keep standard perf diff format and display the 'Baseline' and
'Shared Object'.
The output is sorted by "Baseline" and the basic blocks in the same
function are sorted by cycles diff.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1561713784-30533-7-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Pad the DSO name in --call-trace so we don't have the indent screwed by
different DSO name lengths, as now for kernel there's also BPF code
displayed.
# perf-with-kcore record pt -e intel_pt//ku -- sleep 1
# perf-core/perf-with-kcore script pt --call-trace
Before:
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms]) kretprobe_perf_func
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms]) trace_call_bpf
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_get_current_pid_tgid
sleep 3660 [16] 57036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_ktime_get_ns
sleep 3660 [16] 57036.806464725: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464725: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806465045: (bpf_prog_da4fe6b3d2c29b25_trace_return) __htab_map_lookup_elem
sleep 3660 [16] 57036.806465366: ([kernel.kallsyms]) memcmp
sleep 3660 [16] 57036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_probe_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) probe_kernel_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) __check_object_size
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) check_stack_object
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) copy_user_enhanced_fast_string
sleep 3660 [16] 57036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_probe_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) probe_kernel_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) __check_object_size
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) check_stack_object
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms]) copy_user_enhanced_fast_string
sleep 3660 [16] 57036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_get_current_uid_gid
sleep 3660 [16] 57036.806466008: ([kernel.kallsyms]) from_kgid
sleep 3660 [16] 57036.806466008: ([kernel.kallsyms]) from_kuid
sleep 3660 [16] 57036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_perf_event_output
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms]) perf_event_output
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms]) perf_prepare_sample
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms]) perf_misc_flags
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms]) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806466328: ([kvm]) kvm_is_in_guest
sleep 3660 [16] 57036.806466649: ([kernel.kallsyms]) __perf_event_header__init_id.isra.0
sleep 3660 [16] 57036.806466649: ([kernel.kallsyms]) perf_output_begin
After:
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms] ) kretprobe_perf_func
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms] ) trace_call_bpf
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464404: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_get_current_pid_tgid
sleep 3660 [16] 57036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_ktime_get_ns
sleep 3660 [16] 57036.806464725: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806464725: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806465045: (bpf_prog_da4fe6b3d2c29b25_trace_return ) __htab_map_lookup_elem
sleep 3660 [16] 57036.806465366: ([kernel.kallsyms] ) memcmp
sleep 3660 [16] 57036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_probe_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) probe_kernel_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) __check_object_size
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) check_stack_object
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) copy_user_enhanced_fast_string
sleep 3660 [16] 57036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_probe_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) probe_kernel_read
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) __check_object_size
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) check_stack_object
sleep 3660 [16] 57036.806465687: ([kernel.kallsyms] ) copy_user_enhanced_fast_string
sleep 3660 [16] 57036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_get_current_uid_gid
sleep 3660 [16] 57036.806466008: ([kernel.kallsyms] ) from_kgid
sleep 3660 [16] 57036.806466008: ([kernel.kallsyms] ) from_kuid
sleep 3660 [16] 57036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_perf_event_output
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms] ) perf_event_output
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms] ) perf_prepare_sample
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms] ) perf_misc_flags
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
sleep 3660 [16] 57036.806466328: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislav Fomichev <sdf@google.com>
Link: http://lkml.kernel.org/r/20190508132010.14512-8-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Now 'perf report' can show whole time periods with 'perf script', but
the user still has to find individual samples of interest manually.
It would be expensive and complicated to search for the right samples in
the whole perf file. Typically users only need to look at a small number
of samples for useful analysis.
Also the full scripts tend to show samples of all CPUs and all threads
mixed up, which can be very confusing on larger systems.
Add a new --samples option to save a small random number of samples per
hist entry.
Use a reservoir sample technique to select a representatve number of
samples.
Then allow browsing the samples using 'perf script' as part of the hist
entry context menu. This automatically adds the right filters, so only
the thread or cpu of the sample is displayed. Then we use less' search
functionality to directly jump the to the time stamp of the selected
sample.
It uses different menus for assembler and source display. Assembler
needs xed installed and source needs debuginfo.
Currently it only supports as many samples as fit on the screen due to
some limitations in the slang ui code.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190311174605.GA29294@tassilo.jf.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Many workloads change over time. 'perf report' currently aggregates the
whole time range reported in perf.data.
This patch adds an option for a time quantum to quantisize the perf.data
over time.
This just adds the option, will be used in follow on patches for a time
sort key.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20190305144758.12397-6-andi@firstfloor.org
[ Use NSEC_PER_[MU]SEC ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Upcoming changes add timestamp output in perf report. Add a --ns
argument similar to perf script to support nanoseconds resolution when
needed.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20190305144758.12397-5-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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So that we don't drag all the headers included in symbol.h when needing
to access symbol_conf in another header, such as annotate.h.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-rvo9dzflkneqmprb0dgbfybx@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Jin Yao
Jiri Olsa
Andi Kleen
Arnaldo Carvalho de Melo