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2009-09-13perf sched: Display time in milliseconds, reorganize outputIngo Molnar2-10/+13
After: ----------------------------------------------------------------------------------- Task | runtime ms | switches | average delay ms | maximum delay ms | ----------------------------------------------------------------------------------- migration/0 | 0.000 ms | 1 | avg: 0.047 ms | max: 0.047 ms | ksoftirqd/0 | 0.000 ms | 1 | avg: 0.039 ms | max: 0.039 ms | migration/1 | 0.000 ms | 3 | avg: 0.013 ms | max: 0.016 ms | migration/3 | 0.000 ms | 2 | avg: 0.003 ms | max: 0.004 ms | migration/4 | 0.000 ms | 1 | avg: 0.022 ms | max: 0.022 ms | distccd | 0.000 ms | 1 | avg: 0.004 ms | max: 0.004 ms | distccd | 0.000 ms | 1 | avg: 0.014 ms | max: 0.014 ms | distccd | 0.000 ms | 2 | avg: 0.000 ms | max: 0.000 ms | distccd | 0.000 ms | 2 | avg: 0.012 ms | max: 0.019 ms | distccd | 0.000 ms | 1 | avg: 0.002 ms | max: 0.002 ms | as | 0.000 ms | 2 | avg: 0.019 ms | max: 0.019 ms | as | 0.000 ms | 3 | avg: 0.015 ms | max: 0.017 ms | as | 0.000 ms | 1 | avg: 0.009 ms | max: 0.009 ms | perf | 0.000 ms | 1 | avg: 0.001 ms | max: 0.001 ms | gcc | 0.000 ms | 1 | avg: 0.021 ms | max: 0.021 ms | run-mozilla.sh | 0.000 ms | 2 | avg: 0.010 ms | max: 0.017 ms | mozilla-plugin- | 0.000 ms | 1 | avg: 0.006 ms | max: 0.006 ms | gcc | 0.000 ms | 2 | avg: 0.013 ms | max: 0.013 ms | ----------------------------------------------------------------------------------- (The runtime ms column is not filled in yet.) Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Clean up latency and replay sub-commandsIngo Molnar1-50/+49
- Separate the latency and the replay commands more cleanly - Use consistent naming - Display help page on 'perf sched' outlining comments, instead of aborting Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Add sched latency profilingFrederic Weisbecker1-11/+285
Add the -l --latency option that reports statistics about the scheduler latencies. For now, the latencies are measured in the following sequence scope: - task A is sleeping (D or S state) - task B wakes up A ^ | | latency timeframe | | v - task A is scheduled in Start by recording every scheduler events: perf record -e sched:* and then fetch the results: perf sched -l Tasks count total avg max migration/0 2 39849 19924 28826 ksoftirqd/0 7 756383 108054 373014 migration/1 5 45391 9078 10452 ksoftirqd/1 2 399055 199527 359130 events/0 8 4780110 597513 4500250 events/1 9 6353057 705895 2986012 kblockd/0 42 37805097 900121 5077684 The snapshot are in nanoseconds. - Count: number of snapshots taken for the given task - Total: total latencies in nanosec - Avg : average of latency between wake up and sched in - Max : max snapshot latency Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Make it easier to plug in new sub profilersFrederic Weisbecker1-78/+165
Create a sched event structure of handlers in which various sched events reader can plug their own callbacks. This makes easier the addition of new perf sched sub commands. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Fix bad event alignmentFrederic Weisbecker3-25/+102
perf sched raises the following error when it meets a sched switch event: perf: builtin-sched.c:286: register_pid: Assertion `!(pid >= 65536)' failed. Abandon Currently in x86-64, the sched switch events have a hole in the middle of the structure: u16 common_type; u8 common_flags; u8 common_preempt_count; u32 common_pid; u32 common_tgid; char prev_comm[16]; u32 prev_pid; u32 prev_prio; <--- there u64 prev_state; char next_comm[16]; u32 next_pid; u32 next_prio; Gcc inserts a 4 bytes hole there for prev_state to be u64 aligned. And the events are exported to userspace with this hole. But in userspace, from perf sched, we fetch it using a structure that has a new field in the beginning: u32 size. This is because our trace is exported with its size as a field. But now that we have this new field, the hole in the middle disappears because it makes prev_state becoming well aligned. And since we are using a pointer to the raw trace using this struct, instead of reading prev_state, we are reading the hole. We could fix it by keeping the size seperate from the struct but actually there a lot of other potential problems: some fields may be saved as long in a 64 bits system and later read as long in a 32 bits system. Also this direct cast doesn't care about the endianness differences between the host traced machine and the machine in which we do the post processing. So instead of using such dangerous direct casts, fetch the values using the trace parsing API that already takes care of all these problems. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf tools: Allow the specification of all tracepoints at onceFrederic Weisbecker1-50/+154
Currently, when one wants to activate every tracepoint counters of a subsystem from perf record, the current sequence is needed: perf record -e subsys:ev1 -e subsys:ev2 -e subsys:ev3 This may annoy the most patient of us. Now we can just do: perf record -e subsys:* Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Tighten up the codeIngo Molnar1-189/+47
Various small cleanups - removal of debug printks and dead functions, etc. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Implement the scheduling workload replay engineIngo Molnar1-18/+134
Integrate the schedbench.c bits with the raw trace events that we get from the perf machinery, and activate the workload replayer/simulator. Example of a captured 'make -j' workload: $ perf sched run measurement overhead: 90 nsecs sleep measurement overhead: 2724743 nsecs the run test took 1000081 nsecs the sleep test took 2981111 nsecs version = 0.5 ... nr_run_events: 70 nr_sleep_events: 66 nr_wakeup_events: 9 target-less wakeups: 71 multi-target wakeups: 47 run events optimized: 139 task 0 ( perf: 6607), nr_events: 2 task 1 ( perf: 6608), nr_events: 6 task 2 ( : 0), nr_events: 1 task 3 ( make: 6609), nr_events: 5 task 4 ( sh: 6610), nr_events: 4 task 5 ( make: 6611), nr_events: 6 task 6 ( sh: 6612), nr_events: 4 task 7 ( make: 6613), nr_events: 5 task 8 ( migration/11: 25), nr_events: 1 task 9 ( migration/13: 29), nr_events: 1 task 10 ( migration/15: 33), nr_events: 1 task 11 ( migration/9: 21), nr_events: 1 task 12 ( sh: 6614), nr_events: 4 task 13 ( make: 6615), nr_events: 5 task 14 ( sh: 6616), nr_events: 4 task 15 ( make: 6617), nr_events: 7 task 16 ( migration/3: 9), nr_events: 1 task 17 ( migration/5: 13), nr_events: 1 task 18 ( migration/7: 17), nr_events: 1 task 19 ( migration/1: 5), nr_events: 1 task 20 ( sh: 6618), nr_events: 4 task 21 ( make: 6619), nr_events: 5 task 22 ( sh: 6620), nr_events: 4 task 23 ( make: 6621), nr_events: 10 task 24 ( sh: 6623), nr_events: 3 task 25 ( gcc: 6624), nr_events: 4 task 26 ( gcc: 6625), nr_events: 4 task 27 ( gcc: 6626), nr_events: 5 task 28 ( collect2: 6627), nr_events: 5 task 29 ( sh: 6622), nr_events: 1 task 30 ( make: 6628), nr_events: 7 task 31 ( sh: 6630), nr_events: 4 task 32 ( gcc: 6631), nr_events: 4 task 33 ( sh: 6629), nr_events: 1 task 34 ( gcc: 6632), nr_events: 4 task 35 ( gcc: 6633), nr_events: 4 task 36 ( collect2: 6634), nr_events: 4 task 37 ( make: 6635), nr_events: 8 task 38 ( sh: 6637), nr_events: 4 task 39 ( sh: 6636), nr_events: 1 task 40 ( gcc: 6638), nr_events: 4 task 41 ( gcc: 6639), nr_events: 4 task 42 ( gcc: 6640), nr_events: 4 task 43 ( collect2: 6641), nr_events: 4 task 44 ( make: 6642), nr_events: 6 task 45 ( sh: 6643), nr_events: 5 task 46 ( sh: 6644), nr_events: 3 task 47 ( sh: 6645), nr_events: 4 task 48 ( make: 6646), nr_events: 6 task 49 ( sh: 6647), nr_events: 3 task 50 ( make: 6648), nr_events: 5 task 51 ( sh: 6649), nr_events: 5 task 52 ( sh: 6650), nr_events: 6 task 53 ( make: 6651), nr_events: 4 task 54 ( make: 6652), nr_events: 5 task 55 ( make: 6653), nr_events: 4 task 56 ( make: 6654), nr_events: 4 task 57 ( make: 6655), nr_events: 5 task 58 ( sh: 6656), nr_events: 4 task 59 ( gcc: 6657), nr_events: 9 task 60 ( ksoftirqd/3: 10), nr_events: 1 task 61 ( gcc: 6658), nr_events: 4 task 62 ( make: 6659), nr_events: 5 task 63 ( sh: 6660), nr_events: 3 task 64 ( gcc: 6661), nr_events: 5 task 65 ( collect2: 6662), nr_events: 4 ------------------------------------------------------------ #1 : 256.745, ravg: 256.74, cpu: 0.00 / 0.00 #2 : 439.372, ravg: 275.01, cpu: 0.00 / 0.00 #3 : 411.971, ravg: 288.70, cpu: 0.00 / 0.00 #4 : 385.500, ravg: 298.38, cpu: 0.00 / 0.00 #5 : 366.526, ravg: 305.20, cpu: 0.00 / 0.00 #6 : 381.281, ravg: 312.81, cpu: 0.00 / 0.00 #7 : 410.756, ravg: 322.60, cpu: 0.00 / 0.00 #8 : 368.009, ravg: 327.14, cpu: 0.00 / 0.00 #9 : 408.098, ravg: 335.24, cpu: 0.00 / 0.00 #10 : 368.582, ravg: 338.57, cpu: 0.00 / 0.00 I.e. we successfully analyzed the trace, replayed it via real threads and measured the replayed workload's scheduling properties. This is how it looked like in 'top' output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7164 mingo 20 0 1434m 8080 888 R 57.0 0.1 0:02.04 :perf 7165 mingo 20 0 1434m 8080 888 R 41.8 0.1 0:01.52 :perf 7228 mingo 20 0 1434m 8080 888 R 39.8 0.1 0:01.44 :gcc 7225 mingo 20 0 1434m 8080 888 R 33.8 0.1 0:01.26 :gcc 7202 mingo 20 0 1434m 8080 888 R 31.2 0.1 0:01.16 :sh 7222 mingo 20 0 1434m 8080 888 R 25.2 0.1 0:00.96 :sh 7211 mingo 20 0 1434m 8080 888 R 21.9 0.1 0:00.82 :sh 7213 mingo 20 0 1434m 8080 888 D 19.2 0.1 0:00.74 :sh 7194 mingo 20 0 1434m 8080 888 D 18.6 0.1 0:00.72 :make There's still various kinks in it - more patches to come. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf sched: Import schedbench.cIngo Molnar3-33/+827
Import the schedbench.c tool that i wrote some time ago to simulate scheduler behavior but never finished. It's a good basis for perf sched nevertheless. Most of its guts are not hooked up to the perf event loop yet - that will be done in the patches to come. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-13perf: Add 'perf sched' toolIngo Molnar7-2/+354
This turn-key tool allows scheduler measurements to be conducted and the results be displayed numerically. First baby step towards that goal: clone the new command off of perf trace. Fix a few other details along the way: - add (minimal) perf trace documentation - reorder a few places - list perf trace in the mainporcelain list as well as it's a very useful utility. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-11Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller43-1351/+6051
Conflicts: arch/sparc/Kconfig
2009-09-11Merge branch 'tracing-core-for-linus' of ↵Linus Torvalds1-4/+4
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (105 commits) ring-buffer: only enable ring_buffer_swap_cpu when needed ring-buffer: check for swapped buffers in start of committing tracing: report error in trace if we fail to swap latency buffer tracing: add trace_array_printk for internal tracers to use tracing: pass around ring buffer instead of tracer tracing: make tracing_reset safe for external use tracing: use timestamp to determine start of latency traces tracing: Remove mentioning of legacy latency_trace file from documentation tracing/filters: Defer pred allocation, fix memory leak tracing: remove users of tracing_reset tracing: disable buffers and synchronize_sched before resetting tracing: disable update max tracer while reading trace tracing: print out start and stop in latency traces ring-buffer: disable all cpu buffers when one finds a problem ring-buffer: do not count discarded events ring-buffer: remove ring_buffer_event_discard ring-buffer: fix ring_buffer_read crossing pages ring-buffer: remove unnecessary cpu_relax ring-buffer: do not swap buffers during a commit ring-buffer: do not reset while in a commit ...
2009-09-06Merge commit 'v2.6.31-rc9' into tracing/coreIngo Molnar10-70/+143
Merge reason: move from -rc5 to -rc9. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf tools: Avoid unnecessary work in directory lookupsUlrich Drepper1-31/+37
This patch improves some (common) inefficiencies in the handling of directory lookups: - not using the d_type information returned by the kernel - constructing (absolute) paths for file operation even though directory-relative operations using the *at functions is possible There are more places to fix but this is a start. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <20090904193951.GB6186@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf stat: Clean up statistics calculations a bit morePeter Zijlstra1-17/+14
Remove some, now useless, global storage. Don't calculate the stddev when not needed. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf stat: More advanced variance computationPeter Zijlstra1-12/+12
Use the more advanced single pass variance algorithm outlined on the wikipedia page. This is numerically more stable for larger sample sets. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf stat: Use stddev_mean in stead of stddevPeter Zijlstra1-6/+19
When we're computing the mean by sampling the distribution, then the std dev of the mean is related to the std dev of the sample set by: stddev_mean = std_dev / sqrt(N) Which is exactly what we want. This results in the error on the mean decreasing with increasing number of samples. Also fix the scaled == -1, aka not counted case. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf stat: Remove the limit on repeatPeter Zijlstra1-57/+27
Since we don't need all the individual samples to calculate the error remove both the limit and the storage overhead associated with that. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04perf stat: Change noise calculation to use stddevPeter Zijlstra1-101/+69
The current noise computation does: \Sum abs(n_i - avg(n)) * N^-1.5 Which is (afaik) not a regular noise function, and needs the complete sample set available to post-process. Change this to use a regular stddev computation which can be done by keeping a two sums: stddev = sqrt( 1/N (\Sum n_i^2) - avg(n)^2 ) For which we only need to keep \Sum n_i and \Sum n_i^2. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@kernel.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04sparc: add basic support for 'perf'Jens Axboe1-0/+6
This wires up the perf_counter_open() syscall so that basic software support for perf is working. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-03perf trace: Fix read_string()Ingo Molnar1-1/+4
We did not account for the enclosing \0. Depending on what malloc() gave us this resulted in corrupted version string printouts. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-03perf trace: Print out in nanosecondsIngo Molnar1-2/+2
Print out more accurate timestamps - usecs does not cut it anymore on fast enough boxes ;-) Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-03perf tools: Seek to the end of the header areaIngo Molnar1-1/+1
Leave the input fd at the data area. It does not matter right now - but seeking at the end of it certainly did not make sense. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-03perf trace: Fix parsing of perf.dataIngo Molnar1-0/+1
We started parsing perf.data at head 0. This caused -D to segfault and it could possibly also case incorrect trace entries to be displayed. Parse it at data_offset instead. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-03perf trace: Sample timestamps as wellIngo Molnar2-1/+8
Before: perf-21082 [013] 0.000000: sched_wakeup_new: task perf:21083 [120] success=1 [015] perf-21082 [013] 0.000000: sched_migrate_task: task perf:21082 [120] from: 13 to: 15 perf-21082 [013] 0.000000: sched_process_fork: parent perf:21082 child perf:21083 true-21083 [015] 0.000000: sched_wakeup: task migration/15:33 [0] success=1 [015] perf-21082 [013] 0.000000: sched_switch: task perf:21082 [120] (S) ==> swapper:0 [140] true-21083 [015] 0.000000: sched_switch: task perf:21083 [120] (R) ==> migration/15:33 [0] true-21083 [011] 0.000000: sched_process_exit: task true:21083 [120] After: perf-21082 [013] 14674.797613: sched_wakeup_new: task perf:21083 [120] success=1 [015] perf-21082 [013] 14674.797506: sched_migrate_task: task perf:21082 [120] from: 13 to: 15 perf-21082 [013] 14674.797610: sched_process_fork: parent perf:21082 child perf:21083 true-21083 [015] 14674.797725: sched_wakeup: task migration/15:33 [0] success=1 [015] perf-21082 [013] 14674.797722: sched_switch: task perf:21082 [120] (S) ==> swapper:0 [140] true-21083 [015] 14674.797729: sched_switch: task perf:21083 [120] (R) ==> migration/15:33 [0] true-21083 [011] 14674.798159: sched_process_exit: task true:21083 [120] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-02perf trace: Sample the CPU tooIngo Molnar2-2/+11
Sample, record, parse and print the CPU field - it had all zeroes before. Before (watch the second column, the CPU values): perf-32685 [000] 0.000000: sched_wakeup_new: task perf:32686 [120] success=1 [011] perf-32685 [000] 0.000000: sched_migrate_task: task perf:32685 [120] from: 1 to: 11 perf-32685 [000] 0.000000: sched_process_fork: parent perf:32685 child perf:32686 true-32686 [000] 0.000000: sched_wakeup: task migration/11:25 [0] success=1 [011] true-32686 [000] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015] true-32686 [000] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015] perf-32685 [000] 0.000000: sched_switch: task perf:32685 [120] (S) ==> swapper:0 [140] true-32686 [000] 0.000000: sched_switch: task perf:32686 [120] (R) ==> migration/11:25 [0] true-32686 [000] 0.000000: sched_switch: task perf:32686 [120] (R) ==> distccd:12793 [125] true-32686 [000] 0.000000: sched_switch: task true:32686 [120] (R) ==> distccd:12793 [125] true-32686 [000] 0.000000: sched_process_exit: task true:32686 [120] true-32686 [000] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767985949080 [ns] true-32686 [000] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767986139446 [ns] true-32686 [000] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 132844 [ns] true-32686 [000] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 131724 [ns] After: perf-32685 [001] 0.000000: sched_wakeup_new: task perf:32686 [120] success=1 [011] perf-32685 [001] 0.000000: sched_migrate_task: task perf:32685 [120] from: 1 to: 11 perf-32685 [001] 0.000000: sched_process_fork: parent perf:32685 child perf:32686 true-32686 [011] 0.000000: sched_wakeup: task migration/11:25 [0] success=1 [011] true-32686 [015] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015] true-32686 [015] 0.000000: sched_wakeup: task distccd:12793 [125] success=1 [015] perf-32685 [001] 0.000000: sched_switch: task perf:32685 [120] (S) ==> swapper:0 [140] true-32686 [011] 0.000000: sched_switch: task perf:32686 [120] (R) ==> migration/11:25 [0] true-32686 [015] 0.000000: sched_switch: task perf:32686 [120] (R) ==> distccd:12793 [125] true-32686 [015] 0.000000: sched_switch: task true:32686 [120] (R) ==> distccd:12793 [125] true-32686 [015] 0.000000: sched_process_exit: task true:32686 [120] true-32686 [015] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767985949080 [ns] true-32686 [015] 0.000000: sched_stat_wait: task: distccd:12793 wait: 6767986139446 [ns] true-32686 [015] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 132844 [ns] true-32686 [015] 0.000000: sched_stat_sleep: task: distccd:12793 sleep: 131724 [ns] So we can now see how this workload migrated between CPUs. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-02perf tools: Work around strict aliasing related warningsIngo Molnar2-7/+7
Older versions of GCC are rather stupid about strict aliasing: util/trace-event-parse.c: In function 'parse_cmdlines': util/trace-event-parse.c:93: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c: In function 'parse_proc_kallsyms': util/trace-event-parse.c:155: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:157: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:158: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c: In function 'parse_ftrace_printk': util/trace-event-parse.c:294: warning: dereferencing type-punned pointer will break strict-aliasing rules util/trace-event-parse.c:295: warning: dereferencing type-punned pointer will break strict-aliasing rules make: *** [util/trace-event-parse.o] Error 1 Make it clear to GCC that we intend with those pointers, by passing them through via an explicit (void *) cast. We might want to add -fno-strict-aliasing as well, like the kernel itself does. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-02perf tools: Clean up warnings list in the MakefileIngo Molnar1-1/+24
Make it easier to turn warnings on/off by using a separate line for each warning added. Some of the warnings have too much of a nuisance factor and we might want to turn them off in the future. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-31perf tools: Complete support for dynamic stringsFrederic Weisbecker2-2/+15
Complete support for __str_loc type strings of ftrace events which have dynamic offsets values set for each of them inside their sammples. Before: geany-5759 [000] 0.000000: lock_release: name geany-5759 [000] 0.000000: lock_release: name geany-5759 [000] 0.000000: lock_release: name kondemand/0-362 [000] 0.000000: lock_release: name pdflush-421 [000] 0.000000: lock_release: name After: geany-5759 [000] 0.000000: lock_release: &u->lock geany-5759 [000] 0.000000: lock_release: key geany-5759 [000] 0.000000: lock_release: &group->notification_mutex kondemand/0-362 [000] 0.000000: lock_release: &rq->lock pdflush-421 [000] 0.000000: lock_release: &rq->lock Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1251693921-6579-4-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org>
2009-08-31perf tools: Unify swapper tasks namingFrederic Weisbecker1-1/+1
In perf tools, we hardcode the pid 0 cmdline resolving to "idle" because the init task is not included in the COMM events. But the idle tasks secondary cpus are resolved into their "init" name through the COMM events. We have then such strange result in perf report (ditto with trace): 19.66% init [kernel] [k] acpi_idle_enter_c1 17.32% [idle] [kernel] [k] acpi_idle_enter_c1 It's then better to unify the swapper tasks into a single init name. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1251693921-6579-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
2009-08-31perf tools: Resolve idle thread cmdline for perf traceFrederic Weisbecker1-0/+1
The cmd-trace tool used the cmdline file and resolved the idle thread using a hardcoded check for the 0 task pid. Now we have a centralized way to do that from perf using register_idle_thread() API. Before: :0-0 [000] 0.000000: irq_handler_entry: irq=0 handler=name :0-0 [000] 0.000000: irq_handler_entry: irq=0 handler=name After: [idle]-0 [000] 0.000000: irq_handler_entry: irq=0 handler=name [idle]-0 [000] 0.000000: irq_handler_entry: irq=0 handler=name Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1251693921-6579-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-31perf tools: Librarize idle thread registrationFrederic Weisbecker4-29/+31
Librarize register_idle_thread() used by annotate and report. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1251693921-6579-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-31perf tools: Add missing parameters documentationFrederic Weisbecker2-0/+14
Add missing documentation for the following parameters: - perf record -R - perf report -g Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1251682323-10395-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-31Merge branch 'perfcounters/tracing' into perfcounters/coreIngo Molnar12-10/+4569
Merge reason: this topic is ready now to merge into the main development branch for .32, with functional perf trace output. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-28perf tools: do not complain if root is owning perf.dataPierre Habouzit2-4/+4
This improves patch fa6963b24 so that perf.data stuff that has been dumped as root can be read (annotate/report) by a user without the use of the --force. Rationale is that root has plenty of ways to screw us (usually) that do not require twisted schemes involving specially crafting a perf.data. Signed-off-by: Pierre Habouzit <pierre.habouzit@intersec.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@kernel.org> LKML-Reference: <20090827075902.GF19653@laphroaig.corp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-28perf tools: Fix missing string field printing in perf traceFrederic Weisbecker1-0/+1
Some string fields are not printed because of a missing printf in the post-processing. Before: perf-10070 [000] 0.000000: sched_switch: task :10070 [120] (R) ==> :5720 [120] geany-5720 [000] 0.000000: sched_switch: task :5720 [120] (S) ==> :10070 [120] perf-10070 [000] 0.000000: sched_switch: task :10070 [120] (R) ==> :5720 [120] geany-5720 [000] 0.000000: sched_switch: task :5720 [120] (S) ==> :10070 [120] <idle>-0 [000] 0.000000: sched_switch: task :0 [140] (R) ==> :361 [115] After: perf-10070 [000] 0.000000: sched_switch: task perf:10070 [120] (R) ==> geany:5720 [120] geany-5720 [000] 0.000000: sched_switch: task geany:5720 [120] (S) ==> perf:10070 [120] perf-10070 [000] 0.000000: sched_switch: task perf:10070 [120] (R) ==> geany:5720 [120] geany-5720 [000] 0.000000: sched_switch: task geany:5720 [120] (S) ==> perf:10070 [120] <idle>-0 [000] 0.000000: sched_switch: task swapper:0 [140] (R) ==> kondemand/1:361 [115] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1251427567-10551-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-28perf tools: Only save the event formats we needFrederic Weisbecker7-27/+120
While opening a trace event counter, every events are saved in the trace.info file. But we only want to save the specifications of the events we are using. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1251421798-9101-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-26perf top: Show RIP only in verbose modeArnaldo Carvalho de Melo1-5/+12
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090826145126.GA5255@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-24Merge branch 'perfcounters/urgent' into perfcounters/coreIngo Molnar4-1/+22
Conflicts: tools/perf/builtin-annotate.c tools/perf/builtin-report.c Merge reason: resolve these conflicts. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-21perf trace: Add OPT_END to option array of perf-traceMasami Hiramatsu1-0/+1
Add OPT_END to option array of perf-trace for fixing a SEGV bug when showing perf-trace help message. Without this patch; ./perf trace -h usage: perf trace [<options>] <command> -D, --dump-raw-trace dump raw trace in ASCII -v, --verbose be more verbose (show symbol address, etc) -f, Segmentation fault With this patch: ./perf trace -h usage: perf trace [<options>] <command> -D, --dump-raw-trace dump raw trace in ASCII -v, --verbose be more verbose (show symbol address, etc) Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Zhaolei <zhaolei@cn.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <20090821185603.11039.62109.stgit@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-19perf tools: Check perf.data ownerPeter Zijlstra2-0/+14
Add an owner check to opening perf.data files and a switch to silence it. Because perf-report/perf-annotate are binary parsers reading another users' perf.data file could be a security risk if the file were explicitly engineered to trigger bugs in the parser (we hope of course there are non such bugs, but you never know). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20090819092023.896648538@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Make 'make html' workKyle McMartin1-1/+1
pushd tools/perf/Documentation make html popd is failing for me... ASCIIDOC perf-annotate.html ERROR: unsafe: include file: /etc/asciidoc/./stylesheets/xhtml11.css ERROR: unsafe: include file: /etc/asciidoc/./stylesheets/xhtml11-manpage.css ERROR: unsafe: include file: /etc/asciidoc/./stylesheets/xhtml11-quirks.css make: *** [perf-annotate.html] Error 1 Apparently asciidoc "unsafe" is the default mode of operation in practice. https://bugzilla.redhat.com/show_bug.cgi?id=506953 Works tidily now. Signed-off-by: Kyle McMartin <kyle@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090818164125.GM25206@bombadil.infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Save partial non-overlapping mapFrederic Weisbecker1-3/+22
The librarization of the thread helpers between annotate and report lost some perf report specifics. thread__insert_map() had its most uptodate version in perf report which cared about partial map overlapping. In case of overlap between two maps, perf annotate's version removes the whole old map without considering if it partially or absolutely overlaps the new map. We exported the odd version, change it by using the perf report version. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1250607843-7395-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Fix comm column adjustingFrederic Weisbecker1-2/+23
The librarization of the thread helpers between annotate and report lost some perf report specifics. This patch fixes the thread comm column adjusting that has been omitted during this export. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1250604226-6852-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf annotate: Fix segmentation faultIngo Molnar1-0/+7
Linus reported this perf annotate segfault: [torvalds@nehalem git]$ perf annotate unmap_vmas Segmentation fault #0 map__clone (self=<value optimized out>) at builtin-annotate.c:236 #1 thread__fork (self=<value optimized out>) at builtin-annotate.c:372 The bug here was that builtin-annotate.c was a copy of builtin-report.c and a threading related fix to builtin-report.c didnt get propagated to builtin-annotate.c ... Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Remove obsolete definesIngo Molnar1-4/+0
The _XOPEN_SOURCE* defines are not really needed on Linux and it's not like we'll port this to AIX ;-) The define also broke the build with gcc 4.4.1: CC util/trace-event-parse.o In file included from util/trace-event-parse.c:32: util/util.h:43:1: error: "_XOPEN_SOURCE" redefined So remove them. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Make trace event format parser aware of cast to pointersFrederic Weisbecker1-4/+27
The ftrace event format parser handles the usual casts but not the cast to pointers. Such casts have been introduced recently with the module trace events and raise the following parsing error: Fatal: bad op token ) This is because it considers the "*" character as a binary operator. Make it then aware of casts to pointers. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1250543271-8383-4-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Record events info also when :record suffix is used.Frederic Weisbecker1-3/+11
You can enable a counter's PERF_SAMPLE_RAW attribute in two fashions: - using the -R option (every counters get PERF_SAMPLE_RAW) - using the :record suffix in a trace event counter name Currently we record the events info in a trace.info file from perf record when the former method is used but we omit it with the latter. Check both situations. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1250543271-8383-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Warn while running perf trace without sampleFrederic Weisbecker1-0/+4
When a user runs perf trace using an input with logged counters without PERF_SAMPLE_RAW attribute, warn by giving a nice tip. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1250543271-8383-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18perf tools: Fix spelling mistake in callchain errorFrederic Weisbecker1-1/+1
While running perf report -g in a perf.data file that hasn't been recorded in callchain mode, the error reported has a spelling issue: ./perf report -g selected -c but no callchain data. Did you call perf record without -g? Fix it. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1250543271-8383-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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