1. 13 Nov, 2008 4 commits
    • Steven Rostedt's avatar
      ftrace: rename iter_ctrl to trace_options · ee6bce52
      Steven Rostedt authored
      
      
      Impact: rename file /debug/tracing/iter_ctrl to /debug/tracing/trace_options
      
      The original ftrace had a file called "iter_ctrl" that would control
      the way the output was iterated. But this file grew into a catch all
      for different trace options. This patch renames the file from iter_ctrl
      to trace_options to reflect this change.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      ee6bce52
    • Steven Rostedt's avatar
      ftrace: show buffer size in kilobytes · 1696b2b0
      Steven Rostedt authored
      
      
      Impact: change the units of buffer_size_kb to kilobytes
      
      This patch changes the units of the buffer_size_kb file to kilobytes.
      Reading and writing to the file uses kilobytes as units. To help
      users to know what units are used, the output of the file now
      looks like:
      
        # cat /debug/tracing/buffer_size_kb
        1408
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1696b2b0
    • Steven Rostedt's avatar
      ftrace: rename trace_entries to buffer_size_kb · a94c80e7
      Steven Rostedt authored
      
      
      Impact: rename of debugfs file trace_entries to buffer_size_kb
      
      The original ftrace had fixed size entries, and the number of entries
      was shown and modified via the file called trace_entries. By converting
      to the unified trace buffer, we now allow for variable size entries
      which makes the meaning of trace_entries pointless.
      
      Since trace_size might be confused to the size of the trace, this patch
      names it "buffer_size_kb" (thanks to Arjan van de Ven for this idea).
      
      [ mingo@elte.hu: changed from buffer_size to buffer_size_kb ]
      
      ( Note, the units are still bytes - the next patch changes that,
        to keep the wide rename patch separate from the unit-change patch. )
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a94c80e7
    • Ingo Molnar's avatar
      Merge branches 'tracing/branch-tracer', 'tracing/fastboot',... · 24de3862
      Ingo Molnar authored
      Merge branches 'tracing/branch-tracer', 'tracing/fastboot', 'tracing/function-return-tracer' and 'tracing/urgent' into tracing/core
      24de3862
  2. 12 Nov, 2008 19 commits
    • Frederic Weisbecker's avatar
      tracing/function-return-tracer: call prepare_ftrace_return by registers · 1dc1c6ad
      Frederic Weisbecker authored
      
      
      Impact: Optimize a bit the function return tracer
      
      This patch changes the calling convention of prepare_ftrace_return to
      pass its arguments by register. This will optimize it a bit and
      prepare it to support dynamic tracing.
      
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1dc1c6ad
    • Frederic Weisbecker's avatar
      tracing/function-return-tracer: make the function return tracer lockless · 62d59d17
      Frederic Weisbecker authored
      
      
      Impact: remove spinlocks and irq disabling in function return tracer.
      
      I've tried to figure out all of the race condition that could happen
      when the tracer pushes or pops a return address trace to/from the
      current thread_info.
      
      Theory:
      
      _ One thread can only execute on one cpu at a time. So this code
        doesn't need to be SMP-safe. Just drop the spinlock.
      
      _ The only race could happen between the current thread and an
        interrupt. If an interrupt is raised, it will increase the index of
        the return stack storage and then execute until the end of the
        tracing to finally free the index it used. We don't need to disable
        irqs.
      
      This is theorical. In practice, I've tested it with a two-core SMP and
      had no problem at all. Perhaps -tip testing could confirm it.
      
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      62d59d17
    • Steven Rostedt's avatar
      ftrace: rename trace_unlikely.c file · 94b80ffd
      Steven Rostedt authored
      
      
      Impact: File name change of trace_unlikely.c
      
      The "unlikely" name for the tracer is quite ugly. We renamed all the
      parts of it to "branch" and now it is time to rename the file too.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      94b80ffd
    • Steven Rostedt's avatar
      ftrace: add tracer called branch · 80e5ea45
      Steven Rostedt authored
      
      
      Impact: added new branch tracer
      
      Currently the tracing of branch profiling (unlikelys and likelys hit)
      is only activated by the iter_ctrl. This patch adds a tracer called
      "branch" that will just trace the branch profiling. The advantage
      of adding this tracer is that it can be added to the ftrace selftests
      on startup.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      80e5ea45
    • Steven Rostedt's avatar
      ftrace: rename unlikely iter_ctrl to branch · 9f029e83
      Steven Rostedt authored
      
      
      Impact: rename of iter_ctrl unlikely to branch
      
      The unlikely name is ugly. This patch converts the iter_ctrl command
      "unlikely" and "nounlikely" to "branch" and "nobranch" respectively.
      
      It also renames a lot of internal functions to use "branch" instead
      of "unlikely".
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      9f029e83
    • Steven Rostedt's avatar
      trace: rename unlikely profiler to branch profiler · 2ed84eeb
      Steven Rostedt authored
      
      
      Impact: name change of unlikely tracer and profiler
      
      Ingo Molnar suggested changing the config from UNLIKELY_PROFILE
      to BRANCH_PROFILING. I never did like the "unlikely" name so I
      went one step farther, and renamed all the unlikely configurations
      to a "BRANCH" variant.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      2ed84eeb
    • Stephen Hemminger's avatar
      tracing/fastboot: fix perlcritic warning · 68f96c0c
      Stephen Hemminger authored
      
      
      Impact: cleanup
      
      Fix the following warning from the perl syntax checking tool perlcritic.
      This tool is a lint like tool that checks for perl best practices.
      
      Loop iterator is not lexical at line 113, column 1.
      See page 108 of PBP.  (Severity: 5)
      
      Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      68f96c0c
    • Ingo Molnar's avatar
      tracing: finetune branch-tracer output · 68d119f0
      Ingo Molnar authored
      
      
      Steve suggested the to change the output from this:
      
      >  bash-3471  [003]   357.014755: [ MISS ] sched_info_dequeued:sched_stats.h:177
      >  bash-3471  [003]   357.014756: [ .... ] update_curr:sched_fair.c:489
      >  bash-3471  [003]   357.014758: [ .... ] calc_delta_fair:sched_fair.c:411
      
      to this:
      
      >  bash-3471  [003]   357.014755: [ MISS ] sched_info_dequeued:sched_stats.h:177
      >  bash-3471  [003]   357.014756: [  ok  ] update_curr:sched_fair.c:489
      >  bash-3471  [003]   357.014758: [  ok  ] calc_delta_fair:sched_fair.c:411
      
      as it makes it clearer to the user what it means exactly.
      
      Acked-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      68d119f0
    • Ingo Molnar's avatar
      tracing: branch tracer, fix vdso crash · 2b7d0390
      Ingo Molnar authored
      
      
      Impact: fix bootup crash
      
      the branch tracer missed arch/x86/vdso/vclock_gettime.c from
      disabling tracing, which caused such bootup crashes:
      
        [  201.840097] init[1]: segfault at 7fffed3fe7c0 ip 00007fffed3fea2e sp 000077
      
      also clean up the ugly ifdefs in arch/x86/kernel/vsyscall_64.c by
      creating DISABLE_UNLIKELY_PROFILE facility for code to turn off
      instrumentation on a per file basis.
      
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      2b7d0390
    • Ingo Molnar's avatar
      tracing: branch tracer, tweak output · f88c4ae9
      Ingo Molnar authored
      
      
      Impact: modify the tracer output, to make it a bit easier to read
      
      Change the output from:
      
      >  bash-3471  [003]   357.014755: [INCORRECT] sched_info_dequeued:sched_stats.h:177
      >  bash-3471  [003]   357.014756: [correct] update_curr:sched_fair.c:489
      >  bash-3471  [003]   357.014758: [correct] calc_delta_fair:sched_fair.c:411
      
      to:
      
      >  bash-3471  [003]   357.014755: [ MISS ] sched_info_dequeued:sched_stats.h:177
      >  bash-3471  [003]   357.014756: [ .... ] update_curr:sched_fair.c:489
      >  bash-3471  [003]   357.014758: [ .... ] calc_delta_fair:sched_fair.c:411
      
      it's good to have fields aligned vertically, and the only important
      information is a prediction miss, so display only that information.
      
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f88c4ae9
    • Steven Rostedt's avatar
      tracing: likely/unlikely branch annotation tracer · 52f232cb
      Steven Rostedt authored
      
      
      Impact: new likely/unlikely branch tracer
      
      This patch adds a way to record the instances of the likely() and unlikely()
      branch condition annotations.
      
      When "unlikely" is set in /debugfs/tracing/iter_ctrl the unlikely conditions
      will be added to any of the ftrace tracers. The change takes effect when
      a new tracer is passed into the current_tracer file.
      
      For example:
      
       bash-3471  [003]   357.014755: [INCORRECT] sched_info_dequeued:sched_stats.h:177
       bash-3471  [003]   357.014756: [correct] update_curr:sched_fair.c:489
       bash-3471  [003]   357.014758: [correct] calc_delta_fair:sched_fair.c:411
       bash-3471  [003]   357.014759: [correct] account_group_exec_runtime:sched_stats.h:356
       bash-3471  [003]   357.014761: [correct] update_curr:sched_fair.c:489
       bash-3471  [003]   357.014763: [INCORRECT] calc_delta_fair:sched_fair.c:411
       bash-3471  [003]   357.014765: [correct] calc_delta_mine:sched.c:1279
      
      Which shows the normal tracer heading, as well as whether the condition was
      correct "[correct]" or was mistaken "[INCORRECT]", followed by the function,
      file name and line number.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      52f232cb
    • Steven Rostedt's avatar
      tracing: profile likely and unlikely annotations · 1f0d69a9
      Steven Rostedt authored
      
      
      Impact: new unlikely/likely profiler
      
      Andrew Morton recently suggested having an in-kernel way to profile
      likely and unlikely macros. This patch achieves that goal.
      
      When configured, every(*) likely and unlikely macro gets a counter attached
      to it. When the condition is hit, the hit and misses of that condition
      are recorded. These numbers can later be retrieved by:
      
        /debugfs/tracing/profile_likely    - All likely markers
        /debugfs/tracing/profile_unlikely  - All unlikely markers.
      
      # cat /debug/tracing/profile_unlikely | head
       correct incorrect  %        Function                  File              Line
       ------- ---------  -        --------                  ----              ----
          2167        0   0 do_arch_prctl                  process_64.c         832
             0        0   0 do_arch_prctl                  process_64.c         804
          2670        0   0 IS_ERR                         err.h                34
         71230     5693   7 __switch_to                    process_64.c         673
         76919        0   0 __switch_to                    process_64.c         639
         43184    33743  43 __switch_to                    process_64.c         624
         12740    64181  83 __switch_to                    process_64.c         594
         12740    64174  83 __switch_to                    process_64.c         590
      
      # cat /debug/tracing/profile_unlikely | \
        awk '{ if ($3 > 25) print $0; }' |head -20
         44963    35259  43 __switch_to                    process_64.c         624
         12762    67454  84 __switch_to                    process_64.c         594
         12762    67447  84 __switch_to                    process_64.c         590
          1478      595  28 syscall_get_error              syscall.h            51
             0     2821 100 syscall_trace_leave            ptrace.c             1567
             0        1 100 native_smp_prepare_cpus        smpboot.c            1237
         86338   265881  75 calc_delta_fair                sched_fair.c         408
        210410   108540  34 calc_delta_mine                sched.c              1267
             0    54550 100 sched_info_queued              sched_stats.h        222
         51899    66435  56 pick_next_task_fair            sched_fair.c         1422
             6       10  62 yield_task_fair                sched_fair.c         982
          7325     2692  26 rt_policy                      sched.c              144
             0     1270 100 pre_schedule_rt                sched_rt.c           1261
          1268    48073  97 pick_next_task_rt              sched_rt.c           884
             0    45181 100 sched_info_dequeued            sched_stats.h        177
             0       15 100 sched_move_task                sched.c              8700
             0       15 100 sched_move_task                sched.c              8690
         53167    33217  38 schedule                       sched.c              4457
             0    80208 100 sched_info_switch              sched_stats.h        270
         30585    49631  61 context_switch                 sched.c              2619
      
      # cat /debug/tracing/profile_likely | awk '{ if ($3 > 25) print $0; }'
         39900    36577  47 pick_next_task                 sched.c              4397
         20824    15233  42 switch_mm                      mmu_context_64.h     18
             0        7 100 __cancel_work_timer            workqueue.c          560
           617    66484  99 clocksource_adjust             timekeeping.c        456
             0   346340 100 audit_syscall_exit             auditsc.c            1570
            38   347350  99 audit_get_context              auditsc.c            732
             0   345244 100 audit_syscall_entry            auditsc.c            1541
            38     1017  96 audit_free                     auditsc.c            1446
             0     1090 100 audit_alloc                    auditsc.c            862
          2618     1090  29 audit_alloc                    auditsc.c            858
             0        6 100 move_masked_irq                migration.c          9
             1      198  99 probe_sched_wakeup             trace_sched_switch.c 58
             2        2  50 probe_wakeup                   trace_sched_wakeup.c 227
             0        2 100 probe_wakeup_sched_switch      trace_sched_wakeup.c 144
          4514     2090  31 __grab_cache_page              filemap.c            2149
         12882   228786  94 mapping_unevictable            pagemap.h            50
             4       11  73 __flush_cpu_slab               slub.c               1466
        627757   330451  34 slab_free                      slub.c               1731
          2959    61245  95 dentry_lru_del_init            dcache.c             153
           946     1217  56 load_elf_binary                binfmt_elf.c         904
           102       82  44 disk_put_part                  genhd.h              206
             1        1  50 dst_gc_task                    dst.c                82
             0       19 100 tcp_mss_split_point            tcp_output.c         1126
      
      As you can see by the above, there's a bit of work to do in rethinking
      the use of some unlikelys and likelys. Note: the unlikely case had 71 hits
      that were more than 25%.
      
      Note:  After submitting my first version of this patch, Andrew Morton
        showed me a version written by Daniel Walker, where I picked up
        the following ideas from:
      
        1)  Using __builtin_constant_p to avoid profiling fixed values.
        2)  Using __FILE__ instead of instruction pointers.
        3)  Using the preprocessor to stop all profiling of likely
             annotations from vsyscall_64.c.
      
      Thanks to Andrew Morton, Arjan van de Ven, Theodore Tso and Ingo Molnar
      for their feed back on this patch.
      
      (*) Not ever unlikely is recorded, those that are used by vsyscalls
       (a few of them) had to have profiling disabled.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Theodore Tso <tytso@mit.edu>
      Cc: Arjan van de Ven <arjan@infradead.org>
      Cc: Steven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1f0d69a9
    • Ingo Molnar's avatar
      Merge branches 'tracing/fastboot', 'tracing/function-return-tracer' and... · cb9382e5
      Ingo Molnar authored
      Merge branches 'tracing/fastboot', 'tracing/function-return-tracer' and 'tracing/ring-buffer' into tracing/core
      cb9382e5
    • Steven Rostedt's avatar
      ring-buffer: fix deadlock from reader_lock in read_start · 642edba5
      Steven Rostedt authored
      
      
      Impact: deadlock fix in ring_buffer_read_start
      
      The ring_buffer_iter_reset was called from ring_buffer_read_start
      where both grabbed the reader_lock.
      
      This patch separates out the internals of ring_buffer_iter_reset
      to its own function so that both APIs may grab the reader_lock.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      642edba5
    • Steven Rostedt's avatar
      ring-buffer: no preempt for sched_clock() · 47e74f2b
      Steven Rostedt authored
      
      
      Impact: disable preemption when calling sched_clock()
      
      The ring_buffer_time_stamp still uses sched_clock as its counter.
      But it is a bug to call it with preemption enabled. This requirement
      should not be pushed to the ring_buffer_time_stamp callers, so
      the ring_buffer_time_stamp needs to disable preemption when calling
      sched_clock.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      47e74f2b
    • Frederic Weisbecker's avatar
      tracing/fastboot: Use the ring-buffer timestamp for initcall entries · 74239072
      Frederic Weisbecker authored
      
      
      Impact: Split the boot tracer entries in two parts: call and return
      
      Now that we are using the sched tracer from the boot tracer, we want
      to use the same timestamp than the ring-buffer to have consistent time
      captures between sched events and initcall events.
      
      So we get rid of the old time capture by the boot tracer and split the
      initcall events in two parts: call and return. This way we have the
      ring buffer timestamp of both.
      
      An example trace:
      
      [   27.904149584] calling  net_ns_init+0x0/0x1c0 @ 1
      [   27.904429624] initcall net_ns_init+0x0/0x1c0 returned 0 after 0 msecs
      [   27.904575926] calling  reboot_init+0x0/0x20 @ 1
      [   27.904655399] initcall reboot_init+0x0/0x20 returned 0 after 0 msecs
      [   27.904800228] calling  sysctl_init+0x0/0x30 @ 1
      [   27.905142914] initcall sysctl_init+0x0/0x30 returned 0 after 0 msecs
      [   27.905287211] calling  ksysfs_init+0x0/0xb0 @ 1
       ##### CPU 0 buffer started ####
                  init-1     [000]    27.905395:      1:120:R   + [001]    11:115:S
       ##### CPU 1 buffer started ####
                <idle>-0     [001]    27.905425:      0:140:R ==> [001]    11:115:R
                  init-1     [000]    27.905426:      1:120:D ==> [000]     0:140:R
                <idle>-0     [000]    27.905431:      0:140:R   + [000]     4:115:S
                <idle>-0     [000]    27.905451:      0:140:R ==> [000]     4:115:R
           ksoftirqd/0-4     [000]    27.905456:      4:115:S ==> [000]     0:140:R
                 udevd-11    [001]    27.905458:     11:115:R   + [001]    14:115:R
                <idle>-0     [000]    27.905459:      0:140:R   + [000]     4:115:S
                <idle>-0     [000]    27.905462:      0:140:R ==> [000]     4:115:R
                 udevd-11    [001]    27.905462:     11:115:R ==> [001]    14:115:R
           ksoftirqd/0-4     [000]    27.905467:      4:115:S ==> [000]     0:140:R
                <idle>-0     [000]    27.905470:      0:140:R   + [000]     4:115:S
                <idle>-0     [000]    27.905473:      0:140:R ==> [000]     4:115:R
           ksoftirqd/0-4     [000]    27.905476:      4:115:S ==> [000]     0:140:R
                <idle>-0     [000]    27.905479:      0:140:R   + [000]     4:115:S
                <idle>-0     [000]    27.905482:      0:140:R ==> [000]     4:115:R
           ksoftirqd/0-4     [000]    27.905486:      4:115:S ==> [000]     0:140:R
                 udevd-14    [001]    27.905499:     14:120:X ==> [001]    11:115:R
                 udevd-11    [001]    27.905506:     11:115:R   + [000]     1:120:D
                <idle>-0     [000]    27.905515:      0:140:R ==> [000]     1:120:R
                 udevd-11    [001]    27.905517:     11:115:S ==> [001]     0:140:R
      [   27.905557107] initcall ksysfs_init+0x0/0xb0 returned 0 after 3906 msecs
      [   27.905705736] calling  init_jiffies_clocksource+0x0/0x10 @ 1
      [   27.905779239] initcall init_jiffies_clocksource+0x0/0x10 returned 0 after 0 msecs
      [   27.906769814] calling  pm_init+0x0/0x30 @ 1
      [   27.906853627] initcall pm_init+0x0/0x30 returned 0 after 0 msecs
      [   27.906997803] calling  pm_disk_init+0x0/0x20 @ 1
      [   27.907076946] initcall pm_disk_init+0x0/0x20 returned 0 after 0 msecs
      [   27.907222556] calling  swsusp_header_init+0x0/0x30 @ 1
      [   27.907294325] initcall swsusp_header_init+0x0/0x30 returned 0 after 0 msecs
      [   27.907439620] calling  stop_machine_init+0x0/0x50 @ 1
                  init-1     [000]    27.907485:      1:120:R   + [000]     2:115:S
                  init-1     [000]    27.907490:      1:120:D ==> [000]     2:115:R
              kthreadd-2     [000]    27.907507:      2:115:R   + [001]    15:115:R
                <idle>-0     [001]    27.907517:      0:140:R ==> [001]    15:115:R
              kthreadd-2     [000]    27.907517:      2:115:D ==> [000]     0:140:R
                <idle>-0     [000]    27.907521:      0:140:R   + [000]     4:115:S
                <idle>-0     [000]    27.907524:      0:140:R ==> [000]     4:115:R
                 udevd-15    [001]    27.907527:     15:115:D   + [000]     2:115:D
           ksoftirqd/0-4     [000]    27.907537:      4:115:S ==> [000]     2:115:R
                 udevd-15    [001]    27.907537:     15:115:D ==> [001]     0:140:R
              kthreadd-2     [000]    27.907546:      2:115:R   + [000]     1:120:D
              kthreadd-2     [000]    27.907550:      2:115:S ==> [000]     1:120:R
                  init-1     [000]    27.907584:      1:120:R   + [000]    15:  0:D
                  init-1     [000]    27.907589:      1:120:R   + [000]     2:115:S
                  init-1     [000]    27.907593:      1:120:D ==> [000]    15:  0:R
                 udevd-15    [000]    27.907601:     15:  0:S ==> [000]     2:115:R
       ##### CPU 0 buffer started ####
              kthreadd-2     [000]    27.907616:      2:115:R   + [001]    16:115:R
       ##### CPU 1 buffer started ####
                <idle>-0     [001]    27.907620:      0:140:R ==> [001]    16:115:R
              kthreadd-2     [000]    27.907621:      2:115:D ==> [000]     0:140:R
                 udevd-16    [001]    27.907625:     16:115:D   + [000]     2:115:D
                <idle>-0     [000]    27.907628:      0:140:R   + [000]     4:115:S
                 udevd-16    [001]    27.907629:     16:115:D ==> [001]     0:140:R
                <idle>-0     [000]    27.907631:      0:140:R ==> [000]     4:115:R
           ksoftirqd/0-4     [000]    27.907636:      4:115:S ==> [000]     2:115:R
              kthreadd-2     [000]    27.907644:      2:115:R   + [000]     1:120:D
              kthreadd-2     [000]    27.907647:      2:115:S ==> [000]     1:120:R
                  init-1     [000]    27.907657:      1:120:R   + [001]    16:  0:D
                <idle>-0     [001]    27.907666:      0:140:R ==> [001]    16:  0:R
      [   27.907703862] initcall stop_machine_init+0x0/0x50 returned 0 after 0 msecs
      [   27.907850704] calling  filelock_init+0x0/0x30 @ 1
      [   27.907926573] initcall filelock_init+0x0/0x30 returned 0 after 0 msecs
      [   27.908071327] calling  init_script_binfmt+0x0/0x10 @ 1
      [   27.908165195] initcall init_script_binfmt+0x0/0x10 returned 0 after 0 msecs
      [   27.908309461] calling  init_elf_binfmt+0x0/0x10 @ 1
      
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      74239072
    • Frederic Weisbecker's avatar
      tracing/fastboot: move boot tracer structs and funcs into their own header. · 3f5ec136
      Frederic Weisbecker authored
      
      
      Impact: Cleanups on the boot tracer and ftrace
      
      This patch bring some cleanups about the boot tracer headers. The
      functions and structures of this tracer have nothing related to ftrace
      and should have so their own header file.
      
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      3f5ec136
    • Ingo Molnar's avatar
    • Ingo Molnar's avatar
      Merge branches 'tracing/ftrace' and 'tracing/urgent' into tracing/core · d06bbd66
      Ingo Molnar authored
      Conflicts:
      	kernel/trace/ring_buffer.c
      d06bbd66
  3. 11 Nov, 2008 17 commits
    • Steven Rostedt's avatar
      ring-buffer: clean up warn ons · 3e89c7bb
      Steven Rostedt authored
      
      
      Impact: Restructure WARN_ONs in ring_buffer.c
      
      The current WARN_ON macros in ring_buffer.c are quite ugly.
      
      This patch cleans them up and uses a single RB_WARN_ON that returns
      the value of the condition. This allows the caller to abort the
      function if the condition is true.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      3e89c7bb
    • Ingo Molnar's avatar
      Merge branch 'devel' of... · c1e7abbc
      Ingo Molnar authored
      Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent
      c1e7abbc
    • Steven Rostedt's avatar
      ring-buffer: buffer record on/off switch · a3583244
      Steven Rostedt authored
      
      
      Impact: enable/disable ring buffer recording API added
      
      Several kernel developers have requested that there be a way to stop
      recording into the ring buffers with a simple switch that can also
      be enabled from userspace. This patch addes a new kernel API to the
      ring buffers called:
      
       tracing_on()
       tracing_off()
      
      When tracing_off() is called, all ring buffers will not be able to record
      into their buffers.
      
      tracing_on() will enable the ring buffers again.
      
      These two act like an on/off switch. That is, there is no counting of the
      number of times tracing_off or tracing_on has been called.
      
      A new file is added to the debugfs/tracing directory called
      
        tracing_on
      
      This allows for userspace applications to also flip the switch.
      
        echo 0 > debugfs/tracing/tracing_on
      
      disables the tracing.
      
        echo 1 > /debugfs/tracing/tracing_on
      
      enables it.
      
      Note, this does not disable or enable any tracers. It only sets or clears
      a flag that needs to be set in order for the ring buffers to write to
      their buffers. It is a global flag, and affects all ring buffers.
      
      The buffers start out with tracing_on enabled.
      
      There are now three flags that control recording into the buffers:
      
       tracing_on: which affects all ring buffer tracers.
      
       buffer->record_disabled: which affects an allocated buffer, which may be set
           if an anomaly is detected, and tracing is disabled.
      
       cpu_buffer->record_disabled: which is set by tracing_stop() or if an
           anomaly is detected. tracing_start can not reenable this if
           an anomaly occurred.
      
      The userspace debugfs/tracing/tracing_enabled is implemented with
      tracing_stop() but the user space code can not enable it if the kernel
      called tracing_stop().
      
      Userspace can enable the tracing_on even if the kernel disabled it.
      It is just a switch used to stop tracing if a condition was hit.
      tracing_on is not for protecting critical areas in the kernel nor is
      it for stopping tracing if an anomaly occurred. This is because userspace
      can reenable it at any time.
      
      Side effect: With this patch, I discovered a dead variable in ftrace.c
        called tracing_on. This patch removes it.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      a3583244
    • Linus Torvalds's avatar
      Merge branch 'timers-fixes-for-linus' of... · f21f237c
      Linus Torvalds authored
      Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
      
      * 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
        timers: handle HRTIMER_CB_IRQSAFE_UNLOCKED correctly from softirq context
        nohz: disable tick_nohz_kick_tick() for now
        irq: call __irq_enter() before calling the tick_idle_check
        x86: HPET: enter hpet_interrupt_handler with interrupts disabled
        x86: HPET: read from HPET_Tn_CMP() not HPET_T0_CMP
        x86: HPET: convert WARN_ON to WARN_ON_ONCE
      f21f237c
    • Linus Torvalds's avatar
      Merge branch 'sched-fixes-for-linus' of... · 2f96cb57
      Linus Torvalds authored
      Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
      
      * 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
        sched: release buddies on yield
        fix for account_group_exec_runtime(), make sure ->signal can't be freed under rq->lock
        sched: clean up debug info
      2f96cb57
    • Linus Torvalds's avatar
      Merge branch 'tracing-fixes-for-linus' of... · 09eb3b5b
      Linus Torvalds authored
      Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
      
      * 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
        ring-buffer: prevent infinite looping on time stamping
        ftrace: disable tracing on resize
        ftrace: fix breakage in bin_fmt results
        ftrace: ftrace.txt version update
        ftrace: update txt document
      09eb3b5b
    • Steven Rostedt's avatar
      ring-buffer: add reader lock · f83c9d0f
      Steven Rostedt authored
      
      
      Impact: serialize reader accesses to individual CPU ring buffers
      
      The code in the ring buffer expects only one reader at a time, but currently
      it puts that requirement on the caller. This is not strong enough, and this
      patch adds a "reader_lock" that serializes the access to the reader API
      of the ring buffer.
      
      Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f83c9d0f
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs · 04ca2c17
      Linus Torvalds authored
      * 'for-linus' of git://oss.sgi.com/xfs/xfs:
        [XFS] XFS: Check for valid transaction headers in recovery
        [XFS] handle memory allocation failures during log initialisation
        [XFS] Account for allocated blocks when expanding directories
        [XFS] Wait for all I/O on truncate to zero file size
        [XFS] Fix use-after-free with log and quotas
      04ca2c17
    • Linus Torvalds's avatar
      Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2 · ad1164b7
      Linus Torvalds authored
      * 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2: (21 commits)
        ocfs2: Check search result in ocfs2_xattr_block_get()
        ocfs2: fix printk related build warnings in xattr.c
        ocfs2: truncate outstanding block after direct io failure
        ocfs2/xattr: Proper hash collision handle in bucket division
        ocfs2: return 0 in page_mkwrite to let VFS retry.
        ocfs2: Set journal descriptor to NULL after journal shutdown
        ocfs2: Fix check of return value of ocfs2_start_trans() in xattr.c.
        ocfs2: Let inode be really deleted when ocfs2_mknod_locked() fails
        ocfs2: Fix checking of return value of new_inode()
        ocfs2: Fix check of return value of ocfs2_start_trans()
        ocfs2: Fix some typos in xattr annotations.
        ocfs2: Remove unused ocfs2_restore_xattr_block().
        ocfs2: Don't repeat ocfs2_xattr_block_find()
        ocfs2: Specify appropriate journal access for new xattr buckets.
        ocfs2: Check errors from ocfs2_xattr_update_xattr_search()
        ocfs2: Don't return -EFAULT from a corrupt xattr entry.
        ocfs2: Check xattr block signatures properly.
        ocfs2: add handler_map array bounds checking
        ocfs2: remove duplicate definition in xattr
        ocfs2: fix function declaration and definition in xattr
        ...
      ad1164b7
    • Alan Cox's avatar
      0906dd9d
    • Alan Cox's avatar
    • Linus Torvalds's avatar
      Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 · 853041f0
      Linus Torvalds authored
      * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (35 commits)
        V4L/DVB (9516): cx18: Move DVB buffer transfer handling from irq handler to work_queue
        V4L/DVB (9557): gspca: Small changes for the sensor HV7131B in zc3xx.
        V4L/DVB (9556): gspca: Bad init sequence for sensor HV7131B in zc3xx.
        V4L/DVB (9549): gspca: Fix a typo in one of gspca chips name.
        V4L/DVB (9515): cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup
        V4L/DVB (9493): kconfig patch
        V4L/DVB (9527): af9015: fix compile warnings
        V4L/DVB (9524): af9013: fix bug in status reading
        V4L/DVB (9511): cx18: Mark CX18_CPU_DE_RELEASE_MDL as a slow API call
        V4L/DVB (9510): cx18: Fix write retries for registers that always change - part 2.
        V4L/DVB (9506): ivtv/cx18: fix test whether modules should be loaded or not.
        V4L/DVB (9499): cx88-mpeg: final fix for analogue only compilation + de-alloc fix
        V4L/DVB (9496): cx88-blackbird: bugfix: cx88-blackbird-mpeg-users
        V4L/DVB (9495): cx88-blackbird: bugfix: cx88-blackbird-poll-fix
        V4L/DVB (9494): anysee: initialize anysee_usb_mutex statically
        V4L/DVB (9492): unplug oops from dvb_frontend_init...
        V4L/DVB (9486): ivtv/ivtvfb: no longer experimental
        V4L/DVB (9485): ivtv: remove incorrect V4L1 & tvaudio dependency
        V4L/DVB (9482): Documentation, especially regarding audio and informational links
        V4L/DVB (9475): cx18: Disable write retries for registers that always change - part 1.
        ...
      853041f0
    • Linus Torvalds's avatar
      Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc · e892873c
      Linus Torvalds authored
      * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
        powerpc: Update desktop/server defconfigs
        powerpc: Fix msr check in compat_sys_swapcontext
        powerpc: Repair device bindings documentation
        powerpc: Updated Freescale PPC related defconfigs
        powerpc: Update QE/CPM2 usb_ctlr structures for USB support
        powerpc/86xx: Correct SOC bus-frequency in GE Fanuc SBC610 DTS
        powerpc: Fix Book-E watchdog timer interval setting
        powerpc/fsl-booke: Fix synchronization bug w/local tlb invalidates
      e892873c
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 · eda1be63
      Linus Torvalds authored
      * 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
        drm/i915: Move legacy breadcrumb out of the reserved status page area
        drm/i915: Filter pci devices based on PCI_CLASS_DISPLAY_VGA
        drm/radeon: map registers at load time
        drm: Remove infrastructure for supporting i915's vblank swapping.
        i915: Remove racy delayed vblank swap ioctl.
        i915: Don't whine when pci_enable_msi() fails.
        i915: Don't attempt to short-circuit object_wait_rendering by checking domains.
        i915: Clean up sarea pointers on leavevt
        i915: Save/restore MCHBAR_RENDER_STANDBY on GM965/GM45
      eda1be63
    • Linus Torvalds's avatar
      Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev · 5da38d32
      Linus Torvalds authored
      * 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
        libata: fix last_reset timestamp handling
        libata: Avoid overflow in ata_tf_read_block() when tf->hba_lbal > 127
        [libata] pata_pcmcia: another memory card support
        [libata] pata_sch: notice attached slave devices
        [libata] pata_cs553*.c: cleanup kernel-doc
      5da38d32
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 · 7e2cec86
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
        sparc64: Update defconfig.
        Revert "sparc: correct section of current_pc()"
      7e2cec86
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 · 0a4cf2c8
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
        dsa: fix master interface allmulti/promisc handling
        dsa: fix skb->pkt_type when mac address of slave interface differs
        net: fix setting of skb->tail in skb_recycle_check()
        net: fix /proc/net/snmp as memory corruptor
        mac80211: fix a buffer overrun in station debug code
        netfilter: payload_len is be16, add size of struct rather than size of pointer
        ipv6: fix ip6_mr_init error path
        [4/4] dca: fixup initialization dependency
        [3/4] I/OAT: fix async_tx.callback checking
        [2/4] I/OAT: fix dma_pin_iovec_pages() error handling
        [1/4] I/OAT: fix channel resources free for not allocated channels
        ssb: Fix DMA-API compilation for non-PCI systems
        SSB: hide empty sub menu
        vlan: Fix typos in proc output string
        [netdrvr] usb/hso: Cleanup rfkill error handling
        sfc: Correct address of gPXE boot configuration in EEPROM
        el3_common_init() should be __devinit, not __init
        hso: rfkill type should be WWAN
        mlx4_en: Start port error flow bug fix
        af_key: mark policy as dead before destroying
      0a4cf2c8