Namhyung Kim 4b94f5b7b4 tracing: Add hist trigger 'log2' modifier ...

Allow users to have numeric fields displayed as log2 values in case
value range is very wide by appending '.log2' to field names.

For example,

  # echo 'hist:key=bytes_req' > kmalloc/trigger
  # cat kmalloc/hist

  { bytes_req:        504 } hitcount:          1
  { bytes_req:         11 } hitcount:          1
  { bytes_req:        104 } hitcount:          1
  { bytes_req:         48 } hitcount:          1
  { bytes_req:       2048 } hitcount:          1
  { bytes_req:       4096 } hitcount:          1
  { bytes_req:        240 } hitcount:          1
  { bytes_req:        392 } hitcount:          1
  { bytes_req:         13 } hitcount:          1
  { bytes_req:         28 } hitcount:          1
  { bytes_req:         12 } hitcount:          1
  { bytes_req:         64 } hitcount:          2
  { bytes_req:        128 } hitcount:          2
  { bytes_req:         32 } hitcount:          2
  { bytes_req:          8 } hitcount:         11
  { bytes_req:         10 } hitcount:         13
  { bytes_req:         24 } hitcount:         25
  { bytes_req:        160 } hitcount:         29
  { bytes_req:         16 } hitcount:         33
  { bytes_req:         80 } hitcount:         36

When using '.log2' modifier, the output looks like:

  # echo 'hist:key=bytes_req.log2' > kmalloc/trigger
  # cat kmalloc/hist

  { bytes_req: ~ 2^12 } hitcount:          1
  { bytes_req: ~ 2^11 } hitcount:          1
  { bytes_req: ~ 2^9  } hitcount:          2
  { bytes_req: ~ 2^6  } hitcount:          3
  { bytes_req: ~ 2^3  } hitcount:         13
  { bytes_req: ~ 2^5  } hitcount:         19
  { bytes_req: ~ 2^8  } hitcount:         49
  { bytes_req: ~ 2^7  } hitcount:         57
  { bytes_req: ~ 2^4  } hitcount:         74

Link: http://lkml.kernel.org/r/7ff396b246c6a881f46b979735fddf05a0d6c71a.1457029949.git.tom.zanussi@linux.intel.com

Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2016-04-19 18:56:03 -04:00

..

blktrace.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

bpf_trace.c

bpf: prevent kprobe+bpf deadlocks

2016-03-08 15:28:30 -05:00

ftrace.c

Merge tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-03-24 10:52:25 -07:00

Kconfig

tracing: Add 'hist' event trigger command

2016-04-19 12:16:14 -04:00

Makefile

tracing: Add 'hist' event trigger command

2016-04-19 12:16:14 -04:00

power-traces.c

cpufreq: powernv/tracing: Add powernv_throttle tracepoint

2016-02-05 02:38:02 +01:00

ring_buffer_benchmark.c

ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark

2015-11-03 16:19:02 -05:00

ring_buffer.c

ring-buffer: Process commits whenever moving to a new page.

2015-11-25 15:24:05 -05:00

rpm-traces.c

…

trace_benchmark.c

tracing: Only benchmark the time tracepoints take if tracing is on

2015-11-02 13:34:58 -05:00

trace_benchmark.h

tracing: Add tracepoint benchmark tracepoint

2014-05-29 22:49:54 -04:00

trace_branch.c

tracing: Remove {start,stop}_branch_trace

2015-10-21 10:10:09 -04:00

trace_clock.c

tracing: Export tracing clock functions

2015-05-12 15:56:57 -04:00

trace_entries.h

tracing: %pF is only for function pointers

2015-03-25 08:57:22 -04:00

trace_event_perf.c

Merge tag 'trace-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-01-12 20:04:15 -08:00

trace_events_filter_test.h

…

trace_events_filter.c

tracing: Make ftrace_event_field checking functions available

2016-03-08 11:19:29 -05:00

trace_events_hist.c

tracing: Add hist trigger 'log2' modifier

2016-04-19 18:56:03 -04:00

trace_events_trigger.c

tracing: Add support for named triggers

2016-04-19 18:56:00 -04:00

trace_events.c

tracing: Add 'hist' event trigger command

2016-04-19 12:16:14 -04:00

trace_export.c

tracing: ftrace_event_is_function() can return boolean

2015-11-02 14:28:05 -05:00

trace_functions_graph.c

arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections

2016-03-25 16:37:42 -07:00

trace_functions.c

tracing: Make tracer_flags use the right set_flag callback

2016-03-08 11:19:08 -05:00

trace_irqsoff.c

tracing: Remove redundant reset per-CPU buff in irqsoff tracer

2016-03-18 16:39:11 -04:00

trace_kdb.c

tracing: Move trace_flags from global to a trace_array field

2015-09-30 15:22:55 -04:00

trace_kprobe.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

trace_mmiotrace.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

trace_nop.c

tracing: Fix typoes in code comment and printk in trace_nop.c

2016-03-08 11:23:57 -05:00

trace_output.c

tracing: Record and show NMI state

2016-03-22 18:04:10 -04:00

trace_output.h

tracing: Turn seq_print_user_ip() into a static function

2015-09-28 10:16:12 -04:00

trace_printk.c

tracing: Fix trace_printk() to print when not using bprintk()

2016-03-22 18:02:40 -04:00

trace_probe.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

trace_probe.h

kernel/trace_probe: is_good_name can be boolean

2015-09-22 13:11:30 -04:00

trace_sched_switch.c

sched/core: Fix trace_sched_switch()

2015-10-06 17:08:15 +02:00

trace_sched_wakeup.c

Merge tag 'trace-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-11-06 13:30:20 -08:00

trace_selftest_dynamic.c

…

trace_selftest.c

Merge tag 'trace-3.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2014-10-12 07:28:55 -04:00

trace_seq.c

tracing: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

trace_stack.c

tracing, kasan: Silence Kasan warning in check_stack of stack_tracer

2016-02-19 12:36:44 -05:00

trace_stat.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

trace_stat.h

…

trace_syscalls.c

Merge tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-03-24 10:52:25 -07:00

trace_uprobe.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

trace.c

tracing: Add hist trigger 'log2' modifier

2016-04-19 18:56:03 -04:00

trace.h

tracing: Add support for named triggers

2016-04-19 18:56:00 -04:00

tracing_map.c

tracing: Update some tracing_map constants and comments

2016-04-19 12:16:06 -04:00

tracing_map.h

tracing: Update some tracing_map constants and comments

2016-04-19 12:16:06 -04:00