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SubjectRe: [PATCH v4 0/5] perf report: Show branch type
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On 4/12/2017 6:58 PM, Jiri Olsa wrote:
> On Wed, Apr 12, 2017 at 06:21:01AM +0800, Jin Yao wrote:
>
> SNIP
>
>> 3. Use 2 bits in perf_branch_entry for a "cross" metrics checking
>> for branch cross 4K or 2M area. It's an approximate computing
>> for checking if the branch cross 4K page or 2MB page.
>>
>> For example:
>>
>> perf record -g --branch-filter any,save_type <command>
>>
>> perf report --stdio
>>
>> JCC forward: 27.7%
>> JCC backward: 9.8%
>> JMP: 0.0%
>> IND_JMP: 6.5%
>> CALL: 26.6%
>> IND_CALL: 0.0%
>> RET: 29.3%
>> IRET: 0.0%
>> CROSS_4K: 0.0%
>> CROSS_2M: 14.3%
> got mangled perf report --stdio output for:
>
>
> [root@ibm-x3650m4-02 perf]# ./perf record -j any,save_type kill
> kill: not enough arguments
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.013 MB perf.data (18 samples) ]
>
> [root@ibm-x3650m4-02 perf]# ./perf report --stdio -f | head -30
> # To display the perf.data header info, please use --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 253 of event 'cycles'
> # Event count (approx.): 253
> #
> # Overhead Command Source Shared Object Source Symbol Target Symbol Basic Block Cycles
> # ........ ....... .................... ....................................... ....................................... ..................
> #
> 8.30% perf
> Um [kernel.vmlinux] [k] __intel_pmu_enable_all.constprop.17 [k] native_write_msr -
> 7.91% perf
> Um [kernel.vmlinux] [k] intel_pmu_lbr_enable_all [k] __intel_pmu_enable_all.constprop.17 -
> 7.91% perf
> Um [kernel.vmlinux] [k] native_write_msr [k] intel_pmu_lbr_enable_all -
> 6.32% kill libc-2.24.so [.] _dl_addr [.] _dl_addr -
> 5.93% perf
> Um [kernel.vmlinux] [k] perf_iterate_ctx [k] perf_iterate_ctx -
> 2.77% kill libc-2.24.so [.] malloc [.] malloc -
> 1.98% kill libc-2.24.so [.] _int_malloc [.] _int_malloc -
> 1.58% kill [kernel.vmlinux] [k] __rb_insert_augmented [k] __rb_insert_augmented -
> 1.58% perf
> Um [kernel.vmlinux] [k] perf_event_exec [k] perf_event_exec -
> 1.19% kill [kernel.vmlinux] [k] anon_vma_interval_tree_insert [k] anon_vma_interval_tree_insert -
> 1.19% kill [kernel.vmlinux] [k] free_pgd_range [k] free_pgd_range -
> 1.19% kill [kernel.vmlinux] [k] n_tty_write [k] n_tty_write -
> 1.19% perf
> Um [kernel.vmlinux] [k] native_sched_clock [k] sched_clock -
> ...
> SNIP
>
>
> jirka

Hi,

Thanks so much for trying this patch.

The branch statistics is printed at the end of perf report --stdio.

For example, on my machine,

root@skl:/tmp# perf record -j any,save_type kill
. . . . . .

For more details see kill(1).
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.011 MB perf.data (1 samples) ]

root@skl:/tmp# perf report --stdio
# To display the perf.data header info, please use
--header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 3 of event 'cycles'
# Event count (approx.): 3
#
# Overhead Command Source Shared Object Source Symbol
Target Symbol Basic Block Cycles
# ........ ....... .................... ............................
............................ ..................
#
33.33% perf [kernel.vmlinux] [k]
__intel_pmu_enable_all [k] native_write_msr 10
33.33% perf [kernel.vmlinux] [k]
intel_pmu_lbr_enable_all [k] __intel_pmu_enable_all 4
33.33% perf [kernel.vmlinux] [k]
native_write_msr [k] intel_pmu_lbr_enable_all -


#
# (Tip: Show current config key-value pairs: perf config --list)
#

#
# Branch Statistics:
#
CROSS_4K: 100.0%
CALL: 33.3%
RET: 66.7%

Thanks
Jin Yao

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