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Frederic Weisbecker dbd0b4b330 tracing/ftrace: provide the base infrastructure for histogram tracing ... Impact: extend the tracing API The goal of this patch is to normalize and make more easy the implementation of statistical (histogram) tracing. It implements a trace_stat file into the /debugfs/tracing directory where one can print a one-shot output of statistics/histogram entries. A tracer has to provide two basic iterator callbacks: stat_start() => the first entry stat_next(prev, idx) => the next one. Note that it is adapted for arrays or hash tables or lists.... since it provides a pointer to the previous entry and the current index of the iterator. These two callbacks are called to get a snapshot of the statistics at each opening of the trace_stat file because. The values are so updated between two "cat trace_stat". And the tracer is free to lock its datas during the iteration to keep consistent values. Since it is almost always interesting to sort statisticals values to address the problems by priority, this infrastructure provides a "sorting" of the stat entries too if desired. A tracer has just to provide a stat_cmp callback to compare two entries and the stat tracing infrastructure will build a sorted list of the given entries. A last callback, called stat_headers, can be implemented by a tracer to output headers on its trace. If one of these callbacks is changed on runtime, it just have to signal it to the stat tracing API by calling the init_tracer_stat() helper. Changes in V2: - Fix a memory leak if the user opens multiple times the trace_stat file without closing it. Now we always free our list before rebuilding it. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		16 years ago
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Kconfig	…
Makefile	tracing/ftrace: provide the base infrastructure for histogram tracing	16 years ago
ftrace.c	…
ring_buffer.c	…
trace.c	tracing/ftrace: provide the base infrastructure for histogram tracing	16 years ago
trace.h	tracing/ftrace: provide the base infrastructure for histogram tracing	16 years ago
trace_boot.c	ftrace: set up trace event hash infrastructure	16 years ago
trace_branch.c	ftrace: change trace.c to use registered events	16 years ago
trace_functions.c	…
trace_functions_graph.c	ftrace: set up trace event hash infrastructure	16 years ago
trace_hw_branches.c	ftrace: set up trace event hash infrastructure	16 years ago
trace_irqsoff.c	…
trace_mmiotrace.c	ftrace: set up trace event hash infrastructure	16 years ago
trace_nop.c	…
trace_output.c	ftrace: change trace.c to use registered events	16 years ago
trace_output.h	ftrace: change trace.c to use registered events	16 years ago
trace_power.c	ftrace: set up trace event hash infrastructure	16 years ago
trace_sched_switch.c	…
trace_sched_wakeup.c	…
trace_selftest.c	…
trace_selftest_dynamic.c	…
trace_stack.c	…
trace_stat.c	tracing/ftrace: provide the base infrastructure for histogram tracing	16 years ago
trace_sysprof.c	…