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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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irq	genirq: __irq_set_trigger: change pr_warning to pr_debug	16 years ago
power	Merge branches 'tracing/ftrace', 'tracing/ring-buffer' and 'tracing/urgent' into tracing/core	16 years ago
time	time: catch xtime_nsec underflows and fix them	16 years ago
trace	tracing/ftrace: provide the base infrastructure for histogram tracing	16 years ago
.gitignore	…
Kconfig.freezer	container freezer: implement freezer cgroup subsystem	17 years ago
Kconfig.hz	…
Kconfig.preempt	…
Makefile	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
acct.c	CRED: Wrap task credential accesses in the core kernel	16 years ago
audit.c	[PATCH] fix broken timestamps in AVC generated by kernel threads	16 years ago
audit.h	…
audit_tree.c	Fix inotify watch removal/umount races	16 years ago
auditfilter.c	Fix inotify watch removal/umount races	16 years ago
auditsc.c	Merge branch 'next' into for-linus	16 years ago
backtracetest.c	…
bounds.c	…
capability.c	CRED: Inaugurate COW credentials	16 years ago
cgroup.c	Merge branch 'next' into for-linus	16 years ago
cgroup_debug.c	cgroups: fix probable race with put_css_set[_taskexit] and find_css_set	17 years ago
cgroup_freezer.c	freezer_cg: disable writing freezer.state of root cgroup	16 years ago
compat.c	Merge branches 'timers/clocksource', 'timers/hrtimers', 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/debug' into v28-timers-for-linus	17 years ago
configs.c	kernel/configs.c: remove useless comments	17 years ago
cpu.c	cpuinit fixes in kernel/*	16 years ago
cpuset.c	sched, cpusets: fix warning in kernel/cpuset.c	16 years ago
cred-internals.h	CRED: Inaugurate COW credentials	16 years ago
cred.c	User namespaces: set of cleanups (v2)	16 years ago
delayacct.c	schedstat: consolidate per-task cpu runtime stats	16 years ago
dma-coherent.c	dma-coherent: export dma_[alloc|release]_from_coherent methods	17 years ago
dma.c	kernel/dma.c: remove a CVS keyword	17 years ago
exec_domain.c	proc: move /proc/execdomains to kernel/exec_domain.c	17 years ago
exit.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
extable.c	tracing/function-graph-tracer: introduce __notrace_funcgraph to filter special functions	16 years ago
fork.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
freezer.c	freezer_cg: use thaw_process() in unfreeze_cgroup()	16 years ago
futex.c	CRED: Use RCU to access another task's creds and to release a task's own creds	16 years ago
futex_compat.c	CRED: Use RCU to access another task's creds and to release a task's own creds	16 years ago
hrtimer.c	hrtimer: clean up unused callback modes	16 years ago
itimer.c	timers: fix itimer/many thread hang	17 years ago
kallsyms.c	allow stripping of generated symbols under CONFIG_KALLSYMS_ALL	16 years ago
kexec.c	kexec: fix crash_save_vmcoreinfo_init build problem	17 years ago
kfifo.c	…
kgdb.c	kgdb: call touch_softlockup_watchdog on resume	17 years ago
kmod.c	CRED: Inaugurate COW credentials	16 years ago
kprobes.c	kernel/kprobes.c: don't pad kretprobe_table_locks[] on uniprocessor builds	16 years ago
ksysfs.c	profiling: dynamically enable readprofile at runtime	17 years ago
kthread.c	tracepoints: add DECLARE_TRACE() and DEFINE_TRACE()	16 years ago
latencytop.c	KSYM_SYMBOL_LEN fixes	16 years ago
lockdep.c	ftrace: replace raw_local_irq_save with local_irq_save	16 years ago
lockdep_internals.h	lockdep: build fix	17 years ago
lockdep_proc.c	lockstat: fix numerical output rounding error	17 years ago
marker.c	markers/tracpoints: fix non-modular build	16 years ago
module.c	tracing/function-graph-tracer: introduce __notrace_funcgraph to filter special functions	16 years ago
mutex-debug.c	…
mutex-debug.h	…
mutex.c	…
mutex.h	…
notifier.c	ftrace: ignore functions that cannot be kprobe-ed	17 years ago
ns_cgroup.c	…
nsproxy.c	User namespaces: set of cleanups (v2)	16 years ago
panic.c	taint: add missing comment	16 years ago
params.c	Fix compile warning in kernel/params.c	17 years ago
pid.c	…
pid_namespace.c	pid_ns: (BUG 11391) change ->child_reaper when init->group_leader exits	17 years ago
pm_qos_params.c	pm_qos_requirement might sleep	17 years ago
posix-cpu-timers.c	posix-cpu-timers: fix clock_gettime with CLOCK_PROCESS_CPUTIME_ID	16 years ago
posix-timers.c	Null pointer deref with hrtimer_try_to_cancel()	16 years ago
printk.c	printk: remove unused code from kernel/printk.c	17 years ago
profile.c	Merge commit 'v2.6.28-rc7' into tracing/core	16 years ago
ptrace.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
rcuclassic.c	rcu: RCU-based detection of stalled CPUs for Classic RCU, fix	17 years ago
rcupdate.c	rcupdate: fix bug of rcu_barrier*()	17 years ago
rcupreempt.c	byteorder: remove direct includes of linux/byteorder/swab[b].h	17 years ago
rcupreempt_trace.c	rcu: trace fix possible mem-leak	17 years ago
rcutorture.c	byteorder: remove direct includes of linux/byteorder/swab[b].h	17 years ago
relay.c	relayfs: fix infinite loop with splice()	16 years ago
res_counter.c	…
resource.c	reserve_region_with_split: Fix GFP_KERNEL usage under spinlock	16 years ago
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	…
rtmutex.c	hrtimer: convert kernel/* to the new hrtimer apis	17 years ago
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
sched_clock.c	Revert "sched_clock: prevent scd->clock from moving backwards"	16 years ago
sched_cpupri.c	…
sched_cpupri.h	…
sched_debug.c	sched: add uid information to sched_debug for CONFIG_USER_SCHED	16 years ago
sched_fair.c	sched: optimize update_curr()	16 years ago
sched_features.h	sched: backward looking buddy	16 years ago
sched_idletask.c	sched: add CONFIG_SMP consistency	17 years ago
sched_rt.c	Merge branch 'sched/urgent'; commit 'v2.6.28' into sched/core	16 years ago
sched_stats.h	schedstat: consolidate per-task cpu runtime stats	16 years ago
seccomp.c	…
semaphore.c	semaphore: __down_common: use signal_pending_state()	17 years ago
signal.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
smp.c	generic-ipi: fix the smp_mb() placement	16 years ago
softirq.c	irq: call __irq_enter() before calling the tick_idle_check	16 years ago
softlockup.c	check_hung_task(): unsigned sysctl_hung_task_warnings cannot be less than 0	16 years ago
spinlock.c	lockdep: spin_lock_nest_lock(), checkpatch fixes	17 years ago
srcu.c	…
stacktrace.c	…
stop_machine.c	stop_machine: fix race with return value (fixes Bug #11989)	16 years ago
sys.c	User namespaces: set of cleanups (v2)	16 years ago
sys_ni.c	reintroduce accept4	16 years ago
sysctl.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
sysctl_check.c	…
taskstats.c	…
test_kprobes.c	…
time.c	select: add a timespec_add_safe() function	17 years ago
timeconst.pl	…
timer.c	Merge branch 'master' into next	16 years ago
tracepoint.c	markers/tracpoints: fix non-modular build	16 years ago
tsacct.c	CRED: Use RCU to access another task's creds and to release a task's own creds	16 years ago
uid16.c	CRED: Wrap current->cred and a few other accessors	16 years ago
user.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
user_namespace.c	User namespaces: set of cleanups (v2)	16 years ago
utsname.c	removed unused #include <linux/version.h>'s	17 years ago
utsname_sysctl.c	sysctl: simplify ->strategy	17 years ago
wait.c	wait: kill is_sync_wait()	17 years ago
workqueue.c	Merge branch 'master' into next	16 years ago