Messages in this thread | | | Subject | Re: [PATCH v4 0/5] perf report: Show branch type | From | "Jin, Yao" <> | Date | Wed, 12 Apr 2017 20:25:34 +0800 |
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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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