1. 08 Aug, 2011 2 commits
  2. 03 Aug, 2011 1 commit
  3. 25 Jul, 2011 2 commits
  4. 22 Jul, 2011 1 commit
  5. 21 Jul, 2011 12 commits
  6. 15 Jul, 2011 12 commits
  7. 14 Jul, 2011 7 commits
    • Masami Hiramatsu's avatar
      tracing/kprobes: Rename probe_* to trace_probe_* · 7143f168
      Masami Hiramatsu authored
      Rename probe_* to trace_probe_* for avoiding namespace
      confliction. This also fixes improper names of find_probe_event()
      and cleanup_all_probes() to find_trace_probe() and
      release_all_trace_probes() respectively.
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Link: http://lkml.kernel.org/r/20110627072636.6528.60374.stgit@fedora15Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      7143f168
    • Cyrill Gorcunov's avatar
      perf, x86: P4 PMU - Introduce event alias feature · f9129870
      Cyrill Gorcunov authored
      Instead of hw_nmi_watchdog_set_attr() weak function
      and appropriate x86_pmu::hw_watchdog_set_attr() call
      we introduce even alias mechanism which allow us
      to drop this routines completely and isolate quirks
      of Netburst architecture inside P4 PMU code only.
      
      The main idea remains the same though -- to allow
      nmi-watchdog and perf top run simultaneously.
      
      Note the aliasing mechanism applies to generic
      PERF_COUNT_HW_CPU_CYCLES event only because arbitrary
      event (say passed as RAW initially) might have some
      additional bits set inside ESCR register changing
      the behaviour of event and we can't guarantee anymore
      that alias event will give the same result.
      
      P.S. Thanks a huge to Don and Steven for for testing
           and early review.
      Acked-by: default avatarDon Zickus <dzickus@redhat.com>
      Tested-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
      CC: Ingo Molnar <mingo@elte.hu>
      CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
      CC: Stephane Eranian <eranian@google.com>
      CC: Lin Ming <ming.m.lin@intel.com>
      CC: Arnaldo Carvalho de Melo <acme@redhat.com>
      CC: Frederic Weisbecker <fweisbec@gmail.com>
      Link: http://lkml.kernel.org/r/20110708201712.GS23657@sunSigned-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      f9129870
    • Steven Rostedt's avatar
      tracing: Have dynamic size event stack traces · 4a9bd3f1
      Steven Rostedt authored
      Currently the stack trace per event in ftace is only 8 frames.
      This can be quite limiting and sometimes useless. Especially when
      the "ignore frames" is wrong and we also use up stack frames for
      the event processing itself.
      
      Change this to be dynamic by adding a percpu buffer that we can
      write a large stack frame into and then copy into the ring buffer.
      
      For interrupts and NMIs that come in while another event is being
      process, will only get to use the 8 frame stack. That should be enough
      as the task that it interrupted will have the full stack frame anyway.
      Requested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      4a9bd3f1
    • Sonny Rao's avatar
      perf: Robustify proc and debugfs file recording · 259032bf
      Sonny Rao authored
      While attempting to create a timechart of boot up I found perf didn't
      tolerate modules being loaded/unloaded.  This patch fixes this by
      reading the file once and then writing the size read at the correct
      point in the file.  It also simplifies the code somewhat.
      
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
      Signed-off-by: default avatarSonny Rao <sonnyrao@chromium.org>
      Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
      Link: http://lkml.kernel.org/r/10011.1310614483@neuling.orgSigned-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      259032bf
    • Steven Rostedt's avatar
      ftrace: Fix dynamic selftest failure on some archs · 6331c28c
      Steven Rostedt authored
      Archs that do not implement CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST, will
      fail the dynamic ftrace selftest.
      
      The function tracer has a quick 'off' variable that will prevent
      the call back functions from being called. This variable is called
      function_trace_stop. In x86, this is implemented directly in the mcount
      assembly, but for other archs, an intermediate function is used called
      ftrace_test_stop_func().
      
      In dynamic ftrace, the function pointer variable ftrace_trace_function is
      used to update the caller code in the mcount caller. But for archs that
      do not have CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST set, it only calls
      ftrace_test_stop_func() instead, which in turn calls __ftrace_trace_function.
      
      When more than one ftrace_ops is registered, the function it calls is
      ftrace_ops_list_func(), which will iterate over all registered ftrace_ops
      and call the callbacks that have their hash matching.
      
      The issue happens when two ftrace_ops are registered for different functions
      and one is then unregistered. The __ftrace_trace_function is then pointed
      to the remaining ftrace_ops callback function directly. This mean it will
      be called for all functions that were registered to trace by both ftrace_ops
      that were registered.
      
      This is not an issue for archs with CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST,
      because the update of ftrace_trace_function doesn't happen until after all
      functions have been updated, and then the mcount caller is updated. But
      for those archs that do use the ftrace_test_stop_func(), the update is
      immediate.
      
      The dynamic selftest fails because it hits this situation, and the
      ftrace_ops that it registers fails to only trace what it was suppose to
      and instead traces all other functions.
      
      The solution is to delay the setting of __ftrace_trace_function until
      after all the functions have been updated according to the registered
      ftrace_ops. Also, function_trace_stop is set during the update to prevent
      function tracing from calling code that is caused by the function tracer
      itself.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      6331c28c
    • Steven Rostedt's avatar
      ftrace: Update filter when tracing enabled in set_ftrace_filter() · 072126f4
      Steven Rostedt authored
      Currently, if set_ftrace_filter() is called when the ftrace_ops is
      active, the function filters will not be updated. They will only be updated
      when tracing is disabled and re-enabled.
      
      Update the functions immediately during set_ftrace_filter().
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      072126f4
    • Steven Rostedt's avatar
      ftrace: Balance records when updating the hash · 41fb61c2
      Steven Rostedt authored
      Whenever the hash of the ftrace_ops is updated, the record counts
      must be balance. This requires disabling the records that are set
      in the original hash, and then enabling the records that are set
      in the updated hash.
      
      Moving the update into ftrace_hash_move() removes the bug where the
      hash was updated but the records were not, which results in ftrace
      triggering a warning and disabling itself because the ftrace_ops filter
      is updated while the ftrace_ops was registered, and then the failure
      happens when the ftrace_ops is unregistered.
      
      The current code will not trigger this bug, but new code will.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      41fb61c2
  8. 11 Jul, 2011 1 commit
  9. 08 Jul, 2011 2 commits
    • Steven Rostedt's avatar
      ftrace: Do not disable interrupts for modules in mcount update · 4376cac6
      Steven Rostedt authored
      When I mounted an NFS directory, it caused several modules to be loaded. At the
      time I was running the preemptirqsoff tracer, and it showed the following
      output:
      
      # tracer: preemptirqsoff
      #
      # preemptirqsoff latency trace v1.1.5 on 2.6.33.9-rt30-mrg-test
      # --------------------------------------------------------------------
      # latency: 1177 us, #4/4, CPU#3 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:4)
      #    -----------------
      #    | task: modprobe-19370 (uid:0 nice:0 policy:0 rt_prio:0)
      #    -----------------
      #  => started at: ftrace_module_notify
      #  => ended at:   ftrace_module_notify
      #
      #
      #                  _------=> CPU#
      #                 / _-----=> irqs-off
      #                | / _----=> need-resched
      #                || / _---=> hardirq/softirq
      #                ||| / _--=> preempt-depth
      #                |||| /_--=> lock-depth
      #                |||||/     delay
      #  cmd     pid   |||||| time  |   caller
      #     \   /      ||||||   \   |   /
      modprobe-19370   3d....    0us!: ftrace_process_locs <-ftrace_module_notify
      modprobe-19370   3d.... 1176us : ftrace_process_locs <-ftrace_module_notify
      modprobe-19370   3d.... 1178us : trace_hardirqs_on <-ftrace_module_notify
      modprobe-19370   3d.... 1178us : <stack trace>
       => ftrace_process_locs
       => ftrace_module_notify
       => notifier_call_chain
       => __blocking_notifier_call_chain
       => blocking_notifier_call_chain
       => sys_init_module
       => system_call_fastpath
      
      That's over 1ms that interrupts are disabled on a Real-Time kernel!
      
      Looking at the cause (being the ftrace author helped), I found that the
      interrupts are disabled before the code modification of mcounts into nops. The
      interrupts only need to be disabled on start up around this code, not when
      modules are being loaded.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      4376cac6
    • Steven Rostedt's avatar
      tracing: Still trace filtered irq functions when irq trace is disabled · e4a3f541
      Steven Rostedt authored
      If a function is set to be traced by the set_graph_function, but the
      option funcgraph-irqs is zero, and the traced function happens to be
      called from a interrupt, it will not be traced.
      
      The point of funcgraph-irqs is to not trace interrupts when we are
      preempted by an irq, not to not trace functions we want to trace that
      happen to be *in* a irq.
      
      Luckily the current->trace_recursion element is perfect to add a flag
      to help us be able to trace functions within an interrupt even when
      we are not tracing interrupts that preempt the trace.
      Reported-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      Tested-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      e4a3f541