Re: [PATCH 0/2 v3] tracing/histogram: Add buckets to group data in

[Daniel Bristot de Oliveira]

On 7/7/21 11:36 PM, Steven Rostedt wrote:
> Add a .buckets modifier to group the data instead of having every key saved
> in its own entry, and in a linear fashion instead of like the log2 modifier.
> 
> Changes since v2:
> 
>  - Rename "grouping" field in hist_field to "buckets"
>  - Updated documentation to describe the new modifier
> 
> 
> Steven Rostedt (VMware) (2):
>       tracing: Add linear buckets to histogram logic
>       tracing/histogram: Update the documentation for the buckets modifier

ok, I need this!

Tested on regular and preempt rt kernel.

Tested-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>

[root@alien bristot]# cd /sys/kernel/tracing/
[root@alien tracing]# echo 'hist:keys=duration.buckets=1000:sort=duration' >> events/osnoise/sample_threshold/trigger
[root@alien tracing]# echo osnoise > current_tracer 
[root@alien tracing]# cat events/osnoise/sample_threshold/hist 
# event histogram
#
# trigger info: hist:keys=duration.buckets=1000:vals=hitcount:sort=duration.buckets=1000:size=2048 [active]
#

{ duration: ~ 5000-5999 } hitcount:        384
{ duration: ~ 6000-6999 } hitcount:        175
{ duration: ~ 7000-7999 } hitcount:         55
{ duration: ~ 8000-8999 } hitcount:        230
{ duration: ~ 9000-9999 } hitcount:         60
{ duration: ~ 10000-10999 } hitcount:        123
{ duration: ~ 11000-11999 } hitcount:         20
{ duration: ~ 12000-12999 } hitcount:         40
{ duration: ~ 13000-13999 } hitcount:        954
{ duration: ~ 14000-14999 } hitcount:         43
{ duration: ~ 15000-15999 } hitcount:         41
{ duration: ~ 16000-16999 } hitcount:         12
{ duration: ~ 17000-17999 } hitcount:         44
{ duration: ~ 18000-18999 } hitcount:          6
{ duration: ~ 19000-19999 } hitcount:          7
{ duration: ~ 20000-20999 } hitcount:          4
{ duration: ~ 21000-21999 } hitcount:          5
{ duration: ~ 22000-22999 } hitcount:          1
{ duration: ~ 23000-23999 } hitcount:          2
{ duration: ~ 24000-24999 } hitcount:         13
{ duration: ~ 25000-25999 } hitcount:         14
{ duration: ~ 26000-26999 } hitcount:         10
{ duration: ~ 27000-27999 } hitcount:          1
{ duration: ~ 28000-28999 } hitcount:          5
{ duration: ~ 29000-29999 } hitcount:          5
{ duration: ~ 30000-30999 } hitcount:          4
{ duration: ~ 31000-31999 } hitcount:          2
{ duration: ~ 32000-32999 } hitcount:          2
{ duration: ~ 33000-33999 } hitcount:          3
{ duration: ~ 34000-34999 } hitcount:          1
{ duration: ~ 35000-35999 } hitcount:          1
{ duration: ~ 36000-36999 } hitcount:          4
{ duration: ~ 37000-37999 } hitcount:          2
{ duration: ~ 42000-42999 } hitcount:          1
{ duration: ~ 47000-47999 } hitcount:          1
{ duration: ~ 51000-51999 } hitcount:          5
{ duration: ~ 52000-52999 } hitcount:          2
{ duration: ~ 53000-53999 } hitcount:          6
{ duration: ~ 54000-54999 } hitcount:          3
{ duration: ~ 55000-55999 } hitcount:          9
{ duration: ~ 56000-56999 } hitcount:          7
{ duration: ~ 57000-57999 } hitcount:          5
{ duration: ~ 58000-58999 } hitcount:          2
{ duration: ~ 59000-59999 } hitcount:          4
{ duration: ~ 60000-60999 } hitcount:          1
{ duration: ~ 61000-61999 } hitcount:          4
{ duration: ~ 62000-62999 } hitcount:          2
{ duration: ~ 64000-64999 } hitcount:          4
{ duration: ~ 65000-65999 } hitcount:          3
{ duration: ~ 66000-66999 } hitcount:         17
{ duration: ~ 67000-67999 } hitcount:         12
{ duration: ~ 68000-68999 } hitcount:          1
{ duration: ~ 69000-69999 } hitcount:          9
{ duration: ~ 70000-70999 } hitcount:          8
{ duration: ~ 71000-71999 } hitcount:         10
{ duration: ~ 72000-72999 } hitcount:          3
{ duration: ~ 73000-73999 } hitcount:          1
{ duration: ~ 74000-74999 } hitcount:          2
{ duration: ~ 75000-75999 } hitcount:          3
{ duration: ~ 77000-77999 } hitcount:          3
{ duration: ~ 78000-78999 } hitcount:          2
{ duration: ~ 79000-79999 } hitcount:          2
{ duration: ~ 83000-83999 } hitcount:          3
{ duration: ~ 84000-84999 } hitcount:          1
{ duration: ~ 85000-85999 } hitcount:          1
{ duration: ~ 86000-86999 } hitcount:          6
{ duration: ~ 87000-87999 } hitcount:          3
{ duration: ~ 88000-88999 } hitcount:          2
{ duration: ~ 90000-90999 } hitcount:          1
{ duration: ~ 91000-91999 } hitcount:          1
{ duration: ~ 92000-92999 } hitcount:          1
{ duration: ~ 97000-97999 } hitcount:          1
{ duration: ~ 99000-99999 } hitcount:          4
{ duration: ~ 100000-100999 } hitcount:          2
{ duration: ~ 101000-101999 } hitcount:          1
{ duration: ~ 104000-104999 } hitcount:          1
{ duration: ~ 106000-106999 } hitcount:          1
{ duration: ~ 107000-107999 } hitcount:          1
{ duration: ~ 109000-109999 } hitcount:          1
{ duration: ~ 130000-130999 } hitcount:          1
{ duration: ~ 155000-155999 } hitcount:          1
{ duration: ~ 160000-160999 } hitcount:          1
{ duration: ~ 194000-194999 } hitcount:          1
{ duration: ~ 335000-335999 } hitcount:          1
{ duration: ~ 437000-437999 } hitcount:          1
{ duration: ~ 452000-452999 } hitcount:          1
{ duration: ~ 457000-457999 } hitcount:          1
{ duration: ~ 524000-524999 } hitcount:          1
{ duration: ~ 623000-623999 } hitcount:          1
{ duration: ~ 627000-627999 } hitcount:          1
{ duration: ~ 629000-629999 } hitcount:          1
{ duration: ~ 634000-634999 } hitcount:          1
{ duration: ~ 695000-695999 } hitcount:          1
{ duration: ~ 706000-706999 } hitcount:          1
{ duration: ~ 720000-720999 } hitcount:          1
{ duration: ~ 768000-768999 } hitcount:          1
{ duration: ~ 1296000-1296999 } hitcount:          1
{ duration: ~ 1301000-1301999 } hitcount:          1
{ duration: ~ 1303000-1303999 } hitcount:          1
{ duration: ~ 1306000-1306999 } hitcount:          1
{ duration: ~ 1308000-1308999 } hitcount:          1
{ duration: ~ 1310000-1310999 } hitcount:          1
{ duration: ~ 1314000-1314999 } hitcount:          1
{ duration: ~ 1315000-1315999 } hitcount:          1
{ duration: ~ 1318000-1318999 } hitcount:          1
{ duration: ~ 1321000-1321999 } hitcount:          1
{ duration: ~ 1322000-1322999 } hitcount:          1
{ duration: ~ 1325000-1325999 } hitcount:          1
{ duration: ~ 1330000-1330999 } hitcount:          1
{ duration: ~ 1367000-1367999 } hitcount:          1
{ duration: ~ 1415000-1415999 } hitcount:          1
{ duration: ~ 1420000-1420999 } hitcount:          1
{ duration: ~ 1462000-1462999 } hitcount:          1
{ duration: ~ 1466000-1466999 } hitcount:          1
{ duration: ~ 1489000-1489999 } hitcount:          1
{ duration: ~ 1537000-1537999 } hitcount:          1
{ duration: ~ 1559000-1559999 } hitcount:          1
{ duration: ~ 3176000-3176999 } hitcount:          1
{ duration: ~ 3353000-3353999 } hitcount:          1
{ duration: ~ 3719000-3719999 } hitcount:          1
{ duration: ~ 5824000-5824999 } hitcount:          1

Totals:
    Hits: 2478
    Entries: 121
    Dropped: 0



> ----
>  Documentation/trace/histogram.rst | 92 ++++++++++++++++++++++++++++++++++++---
>  kernel/trace/trace.c              |  1 +
>  kernel/trace/trace_events_hist.c  | 65 ++++++++++++++++++++++++---
>  3 files changed, 145 insertions(+), 13 deletions(-)
>