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Date: Thu, 19 Dec 2019 13:10:33 +0800
From: "Jin, Yao" <yao.jin@...ux.intel.com>
To: Jiri Olsa <jolsa@...hat.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com,
Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 3/3] perf report: support hotkey to let user select any
event for sorting
On 12/19/2019 9:14 AM, Jin, Yao wrote:
>
>
> On 12/18/2019 3:47 PM, Jiri Olsa wrote:
>> On Wed, Dec 18, 2019 at 10:24:43AM +0800, Jin Yao wrote:
>>> When performing "perf report --group", it shows the event group
>>> information
>>> together. In previous patch, we have supported a new option
>>> "--group-sort-idx"
>>> to sort the output by the event at the index n in event group.
>>>
>>> It would be nice if we can use a hotkey in browser to select a event
>>> to sort.
>>>
>>> For example,
>>>
>>> # perf report --group
>>>
>>> Samples: 12K of events 'cpu/instructions,period=2000003/,
>>> cpu/cpu-cycles,period=200003/, ...
>>> Overhead Command Shared
>>> Object Symbol
>>> 92.19% 98.68% 0.00% 93.30% mgen
>>> mgen [.] LOOP1
>>> 3.12% 0.29% 0.00% 0.16% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] 0x0000000000049515
>>> 1.56% 0.03% 0.00% 0.04% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] 0x00000000000494b7
>>> 1.56% 0.01% 0.00% 0.00% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] 0x00000000000494ce
>>> 1.56% 0.00% 0.00% 0.00% mgen
>>> [kernel.kallsyms] [k] task_tick_fair
>>> 0.00% 0.15% 0.00% 0.04% perf
>>> [kernel.kallsyms] [k] smp_call_function_single
>>> 0.00% 0.13% 0.00% 6.08% swapper
>>> [kernel.kallsyms] [k] intel_idle
>>> 0.00% 0.03% 0.00% 0.00% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] g_main_context_check
>>> 0.00% 0.03% 0.00% 0.00% swapper
>>> [kernel.kallsyms] [k] apic_timer_interrupt
>>> 0.00% 0.03% 0.00% 0.00% swapper
>>> [kernel.kallsyms] [k] check_preempt_curr
>>>
>>> When user press hotkey '3' (event index, starting from 0), it indicates
>>> to sort output by the forth event in group.
>>>
>>> Samples: 12K of events 'cpu/instructions,period=2000003/,
>>> cpu/cpu-cycles,period=200003/, ...
>>> Overhead Command Shared
>>> Object Symbol
>>> 92.19% 98.68% 0.00% 93.30% mgen
>>> mgen [.] LOOP1
>>> 0.00% 0.13% 0.00% 6.08% swapper
>>> [kernel.kallsyms] [k] intel_idle
>>> 3.12% 0.29% 0.00% 0.16% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] 0x0000000000049515
>>> 0.00% 0.00% 0.00% 0.06% swapper
>>> [kernel.kallsyms] [k] hrtimer_start_range_ns
>>> 1.56% 0.03% 0.00% 0.04% gsd-color
>>> libglib-2.0.so.0.5600.4 [.] 0x00000000000494b7
>>> 0.00% 0.15% 0.00% 0.04% perf
>>> [kernel.kallsyms] [k] smp_call_function_single
>>> 0.00% 0.00% 0.00% 0.02% mgen
>>> [kernel.kallsyms] [k] update_curr
>>> 0.00% 0.00% 0.00% 0.02% mgen
>>> [kernel.kallsyms] [k] apic_timer_interrupt
>>> 0.00% 0.00% 0.00% 0.02% mgen
>>> [kernel.kallsyms] [k] native_apic_msr_eoi_write
>>> 0.00% 0.00% 0.00% 0.02% mgen
>>> [kernel.kallsyms] [k] __update_load_avg_se
>>
>> when I press 0...9 I'm getting extra columns:
>>
>> Samples: 134 of events 'anon group { cycles:u, instructions:u,
>> cache-misses:u, cycles:u, instructions:u }', Event count (approx.):
>> 7107344
>> Overhead Command Shared Object
>> Symbol Self
>>
>> 17.95% 41.20% 0.00% 12.44% 41.30% ls libc-2.29.so
>> [.] __strcoll_l 17.95% 41.20% 0.00% 12.44%
>> 41.30% N/A
>> 0.00% 13.22% 0.00% 0.00% 0.00% ls ls
>> [.] 0x000000000000871c 0.00% 13.22% 0.00% 0.00%
>> 0.00% N/A
>> 8.32% 11.49% 0.00% 2.62% 9.34% ls ld-2.29.so
>> [.] do_lookup_x 8.32% 11.49% 0.00% 2.62%
>> 9.34% N/A
>> 0.00% 8.29% 31.18% 13.34% 3.05% ls ld-2.29.so
>> [.] _dl_lookup_symbol_x 0.00% 8.29% 31.18% 13.34%
>> 3.05% N/A
>> 0.00% 6.47% 0.00% 0.00% 0.00% ls libc-2.29.so
>> [.] __strlen_avx2 0.00% 6.47% 0.00% 0.00%
>> 0.00% N/A
>> 0.00% 5.97% 0.00% 0.00% 0.00% ls ls
>> [.] 0x0000000000014001 0.00% 5.97% 0.00% 0.00%
>> 0.00% N/A
>> 5.77% 5.83% 7.79% 4.78% 5.04% ls ld-2.29.so
>> [.] strcmp 5.77% 5.83% 7.79% 4.78%
>> 5.04% N/A
>> 2.31% 4.35% 8.30% 0.00% 0.00% ls ld-2.29.so
>> [.] _dl_map_object_from_fd 2.31% 4.35% 8.30% 0.00%
>> 0.00% N/A
>> 0.00% 2.96% 0.00% 1.30% 2.22% ls ld-2.29.so
>> [.] __GI___tunables_init 0.00% 2.96% 0.00% 1.30%
>> 2.22% N/A
>> 0.66% 0.22% 0.68% 0.00% 0.21% ls ld-2.29.so
>> [.] _dl_start 0.66% 0.22% 0.68% 0.00%
>> 0.21% N/A
>> 2.42% 0.00% 0.02% 3.16% 0.00% ls [unknown]
>> [k] 0xffffffffa2a012b0 2.42% 0.00% 0.02% 3.16%
>> 0.00% N/A
>> 0.16% 0.00% 0.01% 0.20% 0.00% ls ld-2.29.so
>> [.] _start 0.16% 0.00% 0.01% 0.20%
>> 0.00% N/A
>> 0.00% 0.00% 11.47% 0.00% 0.00% ls libcap.so.2.26
>> [.] 0x0000000000002420 0.00% 0.00% 11.47% 0.00%
>> 0.00% N/A
>> 0.00% 0.00% 10.50% 0.00% 0.00% ls libc-2.29.so
>> [.] __GI___tcgetattr 0.00% 0.00% 10.50% 0.00%
>> 0.00% N/A
>> 0.00% 0.00% 9.14% 0.00% 0.00% ls ls
>> [.] 0x000000000000767a 0.00% 0.00% 9.14% 0.00%
>> 0.00% N/A
>> 13.60% 0.00% 7.14% 2.31% 0.00% ls ld-2.29.so
>> [.] _dl_relocate_object 13.60% 0.00% 7.14% 2.31%
>> 0.00% N/A
>> 2.13% 0.00% 6.14% 0.00% 0.00% ls ld-2.29.so
>> [.] _dl_map_object_deps 2.13% 0.00% 6.14% 0.00%
>> 0.00% N/A
>> 0.00% 0.00% 5.27% 0.00% 0.00% ls ld-2.29.so
>> [.] strlen 0.00% 0.00% 5.27% 0.00%
>> 0.00% N/A
>> 1.31% 0.00% 2.37% 1.08% 0.00% ls ld-2.29.so
>> [.] _dl_sysdep_start 1.31% 0.00% 2.37% 1.08%
>> 0.00% N/A
>>
>>
>> jirka
>>
>
> Looks it's an existing issue in perf. We can reproduce it by following
> steps.
>
> 1. perf record -a -e cycles,instructions -- sleep 3
> 2. perf report --group
> 3. In browser, we use hotkey 's' to switch to another perf.data
> 4. Now in browser, the extra columns 'Self' and 'Children' will be shown.
>
> But I have not figured out which patch caused this issue. :(
>
> Thanks
> Jin Yao
I have debugged this issue and I find that's because setup_sorting() is
executed again after repeat path, so dimensions are added again.
Could you help to review following fix? Thanks!
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 387311c67264..de988589d99b 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -1076,6 +1076,7 @@ int cmd_report(int argc, const char **argv)
struct stat st;
bool has_br_stack = false;
int branch_mode = -1;
+ int last_key = 0;
bool branch_call_mode = false;
#define CALLCHAIN_DEFAULT_OPT "graph,0.5,caller,function,percent"
static const char report_callchain_help[] = "Display call graph
(stack chain/backtrace):\n\n"
@@ -1450,7 +1451,8 @@ int cmd_report(int argc, const char **argv)
sort_order = sort_tmp;
}
- if (setup_sorting(session->evlist) < 0) {
+ if ((last_key != K_SWITCH_INPUT_DATA) &&
+ (setup_sorting(session->evlist) < 0)) {
if (sort_order)
parse_options_usage(report_usage, options, "s", 1);
if (field_order)
@@ -1530,6 +1532,7 @@ int cmd_report(int argc, const char **argv)
ret = __cmd_report(&report);
if (ret == K_SWITCH_INPUT_DATA) {
perf_session__delete(session);
+ last_key = K_SWITCH_INPUT_DATA;
goto repeat;
} else
ret = 0;
Thanks
Jin Yao
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