Frederic Weisbecker
f413cdb80c
perf_counter: Fix/complete ftrace event records sampling ...
This patch implements the kernel side support for ftrace event
record sampling.
A new counter sampling attribute is added:
PERF_SAMPLE_TP_RECORD
which requests ftrace events record sampling. In this case
if a PERF_TYPE_TRACEPOINT counter is active and a tracepoint
fires, we emit the tracepoint binary record to the
perfcounter event buffer, as a sample.
Result, after setting PERF_SAMPLE_TP_RECORD attribute from perf
record:
perf record -f -F 1 -a -e workqueue:workqueue_execution
perf report -D
0x21e18 [0x48]: event: 9
.
. ... raw event: size 72 bytes
. 0000: 09 00 00 00 01 00 48 00 d0 c7 00 81 ff ff ff ff ......H........
. 0010: 0a 00 00 00 0a 00 00 00 21 00 00 00 00 00 00 00 ........!......
. 0020: 2b 00 01 02 0a 00 00 00 0a 00 00 00 65 76 65 6e +...........eve
. 0030: 74 73 2f 31 00 00 00 00 00 00 00 00 0a 00 00 00 ts/1...........
. 0040: e0 b1 31 81 ff ff ff ff .......
.
0x21e18 [0x48]: PERF_EVENT_SAMPLE (IP, 1): 10: 0xffffffff8100c7d0 period: 33
The raw ftrace binary record starts at offset 0020.
Translation:
struct trace_entry {
type = 0x2b = 43;
flags = 1;
preempt_count = 2;
pid = 0xa = 10;
tgid = 0xa = 10;
}
thread_comm = "events/1"
thread_pid = 0xa = 10;
func = 0xffffffff8131b1e0 = flush_to_ldisc()
What will come next?
- Userspace support ('perf trace'), 'flight data recorder' mode
for perf trace, etc.
- The unconditional copy from the profiling callback brings
some costs however if someone wants no such sampling to
occur, and needs to be fixed in the future. For that we need
to have an instant access to the perf counter attribute.
This is a matter of a flag to add in the struct ftrace_event.
- Take care of the events recursivity! Don't ever try to record
a lock event for example, it seems some locking is used in
the profiling fast path and lead to a tracing recursivity.
That will be fixed using raw spinlock or recursivity
protection.
- [...]
- Profit! :-)
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-09 12:53:48 +02:00
gcov: enable GCOV_PROFILE_ALL for x86_64
2009-06-18 13:03:58 -07:00
genirq: Fix UP compile failure caused by irq_thread_check_affinity
2009-07-22 23:18:46 +02:00
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
clocksource: Prevent NULL pointer dereference
2009-07-19 17:15:54 +02:00
perf_counter: Fix/complete ftrace event records sampling
2009-08-09 12:53:48 +02:00
bsdacct: fix access to invalid filp in acct_on()
2009-06-30 18:56:00 -07:00
async: Fix lack of boot-time console due to insufficient synchronization
2009-06-08 12:31:53 -07:00
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
Audit: clean up all op= output to include string quoting
2009-06-24 00:00:52 -04:00
Audit: clean up all op= output to include string quoting
2009-06-24 00:00:52 -04:00
Fix rule eviction order for AUDIT_DIR
2009-06-24 00:02:38 -04:00
cgroup avoid permanent sleep at rmdir
2009-07-29 19:10:35 -07:00
debug cgroup: remove unneeded cgroup_lock
2009-04-02 19:04:54 -07:00
signals: implement sys_rt_tgsigqueueinfo
2009-04-30 19:24:24 +02:00
mm/init: cpu_hotplug_init() must be initialized before SLAB
2009-06-22 21:18:12 -07:00
cpuset,mm: update tasks' mems_allowed in time
2009-06-16 19:47:31 -07:00
CRED: Rename cred_exec_mutex to reflect that it's a guard against ptrace
2009-05-11 08:15:36 +10:00
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
headers: mnt_namespace.h redux
2009-07-08 09:31:56 -07:00
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
execve: must clear current->clear_child_tid
2009-08-07 10:39:56 -07:00
sched: fix nr_uninterruptible accounting of frozen tasks really
2009-07-18 14:19:53 +02:00
futexes: Fix infinite loop in get_futex_key() on huge page
2009-07-11 12:40:44 +02:00
groups: move code to kernel/groups.c
2009-06-16 19:47:48 -07:00
hrtimer: Fix migration expiry check
2009-07-10 17:32:55 +02:00
kernel/kallsyms.c: replace deprecated __initcall with device_initcall and fix whitespace
2009-06-09 22:37:52 +02:00
kexec: fix omitting offset in extended crashkernel syntax
2009-07-29 19:10:34 -07:00
kernel/kfifo.c: replace conditional test with is_power_of_2()
2009-06-16 19:47:47 -07:00
sysrq, intel_fb: fix sysrq g collision
2009-05-15 07:56:24 -05:00
headers: mnt_namespace.h redux
2009-07-08 09:31:56 -07:00
kprobes: Use kernel_text_address() for checking probe address
2009-07-30 16:44:06 -07:00
update the comment in kthread_stop()
2009-07-27 12:15:46 -07:00
Merge branch 'linus' into tracing/core
2009-05-07 11:17:34 +02:00
lockdep: increase MAX_LOCKDEP_ENTRIES and MAX_LOCKDEP_CHAINS
2009-05-12 19:59:52 +02:00
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-28 11:05:04 -07:00
module: use MODULE_SYMBOL_PREFIX with module_layout
2009-07-27 12:15:45 -07:00
Merge branch 'linus' into perfcounters/core
2009-06-11 17:55:42 +02:00
cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups
2009-04-02 19:04:53 -07:00
nsproxy: extract create_nsproxy()
2009-06-18 13:03:56 -07:00
trace: stop tracer in oops_enter()
2009-07-24 15:30:45 -04:00
module_param: allow 'bool' module_params to be bool, not just int.
2009-06-12 21:46:58 +09:30
perf_counter: Fix/complete ftrace event records sampling
2009-08-09 12:53:48 +02:00
kmemleak: Remove alloc_bootmem annotations introduced in the past
2009-07-09 17:07:02 +01:00
pidns: rewrite copy_pid_ns()
2009-06-18 13:03:55 -07:00
kernel/posix-cpu-timers.c: fix sparse warning
2009-04-30 08:08:31 +02:00
posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW
2009-08-04 10:16:41 +02:00
printk: Add KERN_DEFAULT printk log-level
2009-06-16 11:02:28 -07:00
profile: suppress warning about large allocations when profile=1 is specified
2009-07-29 19:10:36 -07:00
cred_guard_mutex: do not return -EINTR to user-space
2009-07-06 13:57:04 -07:00
kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies
2009-04-03 12:23:02 +02:00
RCU: Don't try and predeclare inline funcs as it upsets some versions of gcc
2009-04-15 13:55:14 -07:00
rcu: rcu_sched_grace_period(): kill the bogus flush_signals()
2009-05-05 20:28:05 +02:00
cpumask: convert rcutorture.c
2009-03-30 22:05:16 +10:30
rcu: Mark Hierarchical RCU no longer experimental
2009-06-24 15:02:48 +02:00
kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies
2009-04-03 12:23:03 +02:00
rcu: Add __rcu_pending tracing to hierarchical RCU
2009-04-14 11:33:43 +02:00
Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-04-05 11:04:19 -07:00
memcg: add interface to reset limits
2009-06-18 13:03:48 -07:00
kernel/resource.c: fix sign extension in reserve_setup()
2009-06-30 18:56:00 -07:00
trivial: fix ETIMEOUT -> ETIMEDOUT typos
2009-06-12 18:01:50 +02:00
rt_mutex: add proxy lock routines
2009-04-06 11:14:02 +02:00
sched: fix load average accounting vs. cpu hotplug
2009-07-18 14:19:52 +02:00
sched: Fix fallback sched_clock()'s offset when using jiffies
2009-05-09 10:08:19 +02:00
sched: Fix race in cpupri introduced by cpumask_var changes
2009-08-02 14:23:29 +02:00
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sched: Hide runqueues from direct refer at source code level
2009-06-17 18:29:42 +02:00
sched: Fix latencytop and sleep profiling vs group scheduling
2009-08-02 14:10:12 +02:00
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
sched, timers: move calc_load() to scheduler
2009-05-15 15:32:45 +02:00
sched_rt: Fix overload bug on rt group scheduling
2009-07-10 10:43:29 +02:00
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
do_sigaltstack: small cleanups
2009-08-01 11:18:56 -07:00
slow-work: use round_jiffies() for thread pool's cull and OOM timers
2009-06-16 19:47:49 -07:00
generic-ipi: fix hotplug_cfd()
2009-08-07 10:39:55 -07:00
softirq: introduce tasklet_hrtimer infrastructure
2009-07-22 17:01:17 +02:00
Allow rwlocks to re-enable interrupts
2009-04-02 19:05:11 -07:00
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
groups: move code to kernel/groups.c
2009-06-16 19:47:48 -07:00
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-28 11:05:28 -07:00
timer: Avoid reading uninitialized data
2009-07-18 23:11:43 +02:00
tracepoints: dont update zero-sized tracepoint sections
2009-03-18 19:55:00 +01:00
Fix fixpoint divide exception in acct_update_integrals
2009-03-09 08:13:35 -07:00
sched: delayed cleanup of user_struct
2009-06-15 21:30:23 -07:00
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
utsns: extract creeate_uts_ns()
2009-06-18 13:03:55 -07:00
proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers
2009-04-02 19:05:01 -07:00
wait: don't use __wake_up_common()
2009-04-14 17:17:16 +02:00
ftrace, workqueuetrace: make workqueue tracepoints use TRACE_EVENT macro
2009-06-02 01:10:40 +02:00
f413cdb80c