1. 09 Dec, 2009 8 commits
    • Masami Hiramatsu's avatar
      perf probe: Update perf-probe document · c937fe20
      Masami Hiramatsu authored
      Add --list and --del option descriptions to perf-probe.txt.
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <20091208220330.10142.73296.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      c937fe20
    • Masami Hiramatsu's avatar
      perf probe: Support --del option · fa28244d
      Masami Hiramatsu authored
      Support perf probe --del <event> option. Currently,
      perf probe can have only one event for each --del option.
      If you'd like to delete several probe events, you need
      to specify --del for each events.
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220323.10142.62079.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      fa28244d
    • Masami Hiramatsu's avatar
      trace-kprobe: Support delete probe syntax · a7c312be
      Masami Hiramatsu authored
      Support delete probe syntax. The syntax is "-:[group/]event".
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220316.10142.39192.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      a7c312be
    • Masami Hiramatsu's avatar
      perf probe: Support vmlinux on cwd by default · f984f03d
      Masami Hiramatsu authored
      Support vmlinux on current working direcotry by default and
      also update file-open messages.
      Now perf probe searches ./vmlinux too.
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220309.10142.33040.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f984f03d
    • Masami Hiramatsu's avatar
      perf probe: Remove event suffix number _0 · 17f88fcd
      Masami Hiramatsu authored
      Remove event suffix number _0 if it is the first.
      The first event has no suffix, and from the second,
      each event has suffix number counted from _1. This
      reduces typing cost :-).
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220301.10142.50031.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      17f88fcd
    • Masami Hiramatsu's avatar
      perf probe: Fix add-probe command syntax without --add option · d1bde3f7
      Masami Hiramatsu authored
      Fix add-probe command syntax without --add option.
      perf-probe supports add-probe command without --add
      option. But it treats each argument as an event definition.
      e.g.
      
      perf probe func arg1 arg2
      
       is interpreted as
      
      perf probe --add func --add arg1 --add arg2
      
      But it may be useless in many cases.
      
      This patch fixes this syntax to fold those arguments into
      one event definition if there is no --add option. With this
      change, above command is interpreted as below;
      
      perf probe --add "func arg1 arg2"
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220254.10142.73767.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      d1bde3f7
    • Masami Hiramatsu's avatar
      perf probe: Change probe-added message more user-friendly · a9b495b0
      Masami Hiramatsu authored
      Change probe-added message more user-friendly expression and
      show usage of new events.
      
      Before:
      Added new event: p:probe/schedule_0 schedule+10 prev=%ax cpu=%bx
      
      After:
      Added new event:
        probe:schedule_1                         (on schedule+1 with prev cpu)
      
      You can now use it on all perf tools, such as:
      
              perf record -e probe:schedule_1 -a sleep 1
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220247.10142.91642.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a9b495b0
    • Masami Hiramatsu's avatar
      perf probe: Change event list format · 278498d4
      Masami Hiramatsu authored
      Change event list format for user readability. perf probe --list
      shows event list in "[GROUP:EVENT] EVENT-DEFINITION" format, but
      this format is different from the output of perf-list, and
      EVENT-DEFINITION is a bit blunt. This patch changes the format to
      more user friendly one.
      
      Before:
      [probe:schedule_0]	schedule+10 prev cpu
      
      After:
        probe:schedule_0                         (on schedule+10 with prev cpu)
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      LKML-Reference: <20091208220240.10142.42916.stgit@dhcp-100-2-132.bos.redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      278498d4
  2. 08 Dec, 2009 2 commits
  3. 07 Dec, 2009 16 commits
  4. 06 Dec, 2009 14 commits
    • Arnaldo Carvalho de Melo's avatar
      perf buildid-list: Fix copy'n'paste help message · b9b1e1c7
      Arnaldo Carvalho de Melo authored
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frédéric 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: <1260129790-11520-1-git-send-email-acme@infradead.org>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      b9b1e1c7
    • OGAWA Hirofumi's avatar
      perf tools: Misc small fixes · 7691b1ec
      OGAWA Hirofumi authored
      - util/header.c
      	"len" is aligned to 64. So, it tries to write the out of
      	long_name buffer.
      
      	So, this use "zero_buf" to write aligned area.
      
      - util/trace-event-read.c
      	"size" is not including nul byte. So, this allocates it, and set '\0'.
      
      - util/trace-event-parse.c
      	It needs parens to calc correct size.
      Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <87d42s8iiu.fsf_-_@devron.myhome.or.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      7691b1ec
    • OGAWA Hirofumi's avatar
      perf: Make common SAMPLE_EVENT parser · 180f95e2
      OGAWA Hirofumi authored
      Currently, sample event data is parsed for each commands, and it
      is assuming that the data is not including other data. (E.g.
      timechart, trace, etc. can't parse the event if it has
      PERF_SAMPLE_CALLCHAIN)
      
      So, even if we record the superset data for multiple commands at
      a time, commands can't parse. etc.
      
      To fix it, this makes common sample event parser, and use it to
      parse sample event correctly. (PERF_SAMPLE_READ is unsupported
      for now though, it seems to be not using.)
      Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <87hbs48imv.fsf@devron.myhome.or.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      180f95e2
    • OGAWA Hirofumi's avatar
      perf timechart: Fix header handling · 028c5152
      OGAWA Hirofumi authored
      Update "struct trace_entry" to match with current one. And
      remove "size" field from it.
      
      If it has "size", it become cause of alignment mismatch of
      structure with kernel.
      Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
      Acked-by: default avatarArjan van de Ven <arjan@infradead.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      LKML-Reference: <87ljhg8ioe.fsf@devron.myhome.or.jp>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      028c5152
    • Jean Delvare's avatar
      x86, perf probe: Fix warning in test_get_len() · be2bf0a2
      Jean Delvare authored
      Fix the following warning:
      
       arch/x86/tools/test_get_len.c: In function "main":
       arch/x86/tools/test_get_len.c:116: warning: unused variable "c"
      Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      be2bf0a2
    • Julia Lawall's avatar
      perf tools: Correct size computation in tracepoint_id_to_path() · 59b4caeb
      Julia Lawall authored
      The size argument to zalloc should be the size of desired
      structure, not the pointer to it.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @expression@
      expression *x;
      @@
      
      x =
       <+...
      -sizeof(x)
      +sizeof(*x)
      ...+>// </smpl>
      Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
      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: <Pine.LNX.4.64.0912061016120.20858@ask.diku.dk>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      59b4caeb
    • Frederic Weisbecker's avatar
      x86: Fixup wrong irq frame link in stacktraces · af2d8289
      Frederic Weisbecker authored
      When we enter in irq, two things can happen to preserve the link
      to the previous frame pointer:
      
      - If we were in an irq already, we don't switch to the irq stack
        as we are inside. We just need to save the previous frame
        pointer and to link the new one to the previous.
      
      - Otherwise we need another level of indirection. We enter the irq with
        the previous stack. We save the previous bp inside and make bp
        pointing to its saved address. Then we switch to the irq stack and
        push bp another time but to the new stack. This makes two levels to
        dereference instead of one.
      
      In the second case, the current stacktrace code omits the second level
      and loses the frame pointer accuracy. The stack that follows will then
      be considered as unreliable.
      
      Handling that makes the perf callchain happier.
      Before:
      
      43.94%  [k] _raw_read_lock
                  |
                  --- _read_lock
                     |
                     |--60.53%-- send_sigio
                     |          __kill_fasync
                     |          kill_fasync
                     |          evdev_pass_event
                     |          evdev_event
                     |          input_pass_event
                     |          input_handle_event
                     |          input_event
                     |          synaptics_process_byte
                     |          psmouse_handle_byte
                     |          psmouse_interrupt
                     |          serio_interrupt
                     |          i8042_interrupt
                     |          handle_IRQ_event
                     |          handle_edge_irq
                     |          handle_irq
                     |          __irqentry_text_start
                     |          ret_from_intr
                     |          |
                     |          |--30.43%-- __select
                     |          |
                     |          |--17.39%-- 0x454f15
                     |          |
                     |          |--13.04%-- __read
                     |          |
                     |          |--13.04%-- vread_hpet
                     |          |
                     |          |--13.04%-- _xcb_lock_io
                     |          |
                     |           --13.04%-- 0x7f630878ce8
      
      After:
      
          50.00%  [k] _raw_read_lock
                  |
                  --- _read_lock
                     |
                     |--98.97%-- send_sigio
                     |          __kill_fasync
                     |          kill_fasync
                     |          evdev_pass_event
                     |          evdev_event
                     |          input_pass_event
                     |          input_handle_event
                     |          input_event
                     |          |
                     |          |--96.88%-- synaptics_process_byte
                     |          |          psmouse_handle_byte
                     |          |          psmouse_interrupt
                     |          |          serio_interrupt
                     |          |          i8042_interrupt
                     |          |          handle_IRQ_event
                     |          |          handle_edge_irq
                     |          |          handle_irq
                     |          |          __irqentry_text_start
                     |          |          ret_from_intr
                     |          |          |
                     |          |          |--39.78%-- __const_udelay
                     |          |          |          |
                     |          |          |          |--91.89%-- ath5k_hw_register_timeout
                     |          |          |          |          ath5k_hw_noise_floor_calibration
                     |          |          |          |          ath5k_hw_reset
                     |          |          |          |          ath5k_reset
                     |          |          |          |          ath5k_config
                     |          |          |          |          ieee80211_hw_config
                     |          |          |          |          |
                     |          |          |          |          |--88.24%-- ieee80211_scan_work
                     |          |          |          |          |          worker_thread
                     |          |          |          |          |          kthread
                     |          |          |          |          |          child_rip
                     |          |          |          |          |
                     |          |          |          |           --11.76%-- ieee80211_scan_completed
                     |          |          |          |                     ieee80211_scan_work
                     |          |          |          |                     worker_thread
                     |          |          |          |                     kthread
                     |          |          |          |                     child_rip
                     |          |          |          |
                     |          |          |           --8.11%-- ath5k_hw_noise_floor_calibration
                     |          |          |                     ath5k_hw_reset
                     |          |          |                     ath5k_reset
                     |          |          |                     ath5k_config
      
      Note: This does not only affect perf events but also x86-64
      stacktraces. They were considered as unreliable once we quit
      the irq stack frame.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      af2d8289
    • Frederic Weisbecker's avatar
      x86: Fixup wrong debug exception frame link in stacktraces · b625b3b3
      Frederic Weisbecker authored
      While dumping a stacktrace, the end of the exception stack won't link
      the frame pointer to the previous stack.
      
      The interrupted stack will then be considered as unreliable and ignored
      by perf, as the frame pointer is unreliable itself.
      
      This happens because we overwrite the frame pointer that links to the
      interrupted frame with the address of the exception stack. This is
      done in order to reserve space inside.
      But rbp has been chosen here only because it is not a scratch register,
      so that the address of the exception stack remains in rbp after calling
      do_debug(), we can then release the exception stack space without the
      need to retrieve its address again.
      
      But we can pick another non-scratch register to do that, so that we
      preserve the link to the interrupted stack frame in the stacktraces.
      
      Just randomly choose r12. Every registers are saved just before and
      restored just after calling do_debug(). And r12 is not used in the
      middle, which makes it a perfect candidate.
      
      Example: perf record -g -a -c 1 -f -e mem:$(tasklist_lock_addr):rw
      
      Before:
          44.18%  [k] _raw_read_lock
                  |
                  |
                  ---  |--6.31%-- waitid
                       |
                       |--4.26%-- writev
                       |
                       |--3.63%-- __select
                       |
                       |--3.15%-- __waitpid
                       |          |
                       |          |--28.57%-- 0x8b52e00000139f
                       |          |
                       |          |--28.57%-- 0x8b52e0000013c6
                       |          |
                       |          |--14.29%-- 0x7fde786dc000
                       |          |
                       |          |--14.29%-- 0x62696c2f7273752f
                       |          |
                       |           --14.29%-- 0x1ea9df800000000
                       |
                       |--3.00%-- __poll
      
      After:
      
          43.94%  [k] _raw_read_lock
                  |
                  --- _read_lock
                     |
                     |--60.53%-- send_sigio
                     |          __kill_fasync
                     |          kill_fasync
                     |          evdev_pass_event
                     |          evdev_event
                     |          input_pass_event
                     |          input_handle_event
                     |          input_event
                     |          synaptics_process_byte
                     |          psmouse_handle_byte
                     |          psmouse_interrupt
                     |          serio_interrupt
                     |          i8042_interrupt
                     |          handle_IRQ_event
                     |          handle_edge_irq
                     |          handle_irq
                     |          __irqentry_text_start
                     |          ret_from_intr
                     |          |
                     |          |--30.43%-- __select
                     |          |
                     |          |--17.39%-- 0x454f15
                     |          |
                     |          |--13.04%-- __read
                     |          |
                     |          |--13.04%-- vread_hpet
                     |          |
                     |          |--13.04%-- _xcb_lock_io
                     |          |
                     |           --13.04%-- 0x7f630878ce87
      
      Note: it does not only affect perf events but also other stacktraces in
      x86-64. They were considered as unreliable once we quit the debug
      stack frame.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      b625b3b3
    • Frederic Weisbecker's avatar
      x86/perf: Exclude the debug stack from the callchains · 7f33f9c5
      Frederic Weisbecker authored
      Dumping the callchains from breakpoint events with perf gives strange
      results:
      
      3.75%             perf  [kernel]           [k] _raw_read_unlock
                             |
                             --- _raw_read_unlock
                                 perf_callchain
                                 perf_prepare_sample
                                 __perf_event_overflow
                                 perf_swevent_overflow
                                 perf_swevent_add
                                 perf_bp_event
                                 hw_breakpoint_exceptions_notify
                                 notifier_call_chain
                                 __atomic_notifier_call_chain
                                 atomic_notifier_call_chain
                                 notify_die
                                 do_debug
                                 debug
                                 munmap
      
      We are infected with all the debug stack. Like the nmi stack, the debug
      stack is undesired as it is part of the profiling path, not helpful for
      the user.
      
      Ignore it.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      7f33f9c5
    • Frederic Weisbecker's avatar
      perf: Remove the "event" callback from perf events · c0dfb2fe
      Frederic Weisbecker authored
      As it is not used anymore and has been superseded by overflow_handler.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      c0dfb2fe
    • Frederic Weisbecker's avatar
      hw-breakpoints: Use overflow handler instead of the event callback · b326e956
      Frederic Weisbecker authored
      struct perf_event::event callback was called when a breakpoint
      triggers. But this is a rather opaque callback, pretty
      tied-only to the breakpoint API and not really integrated into perf
      as it triggers even when we don't overflow.
      
      We prefer to use overflow_handler() as it fits into the perf events
      rules, being called only when we overflow.
      Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      b326e956
    • Frederic Weisbecker's avatar
      hw-breakpoints: Drop callback and task parameters from modify helper · 2f0993e0
      Frederic Weisbecker authored
      Drop the callback and task parameters from modify_user_hw_breakpoint().
      For now we have no user that need to modify a breakpoint to the point
      of changing its handler or its task context.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      2f0993e0
    • Frederic Weisbecker's avatar
      perf: Remove unused struct perf_event::event_callback · 9cef3081
      Frederic Weisbecker authored
      This field might result from an older manual rebasing mistake.
      We don't use it.
      Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      9cef3081
    • Frederic Weisbecker's avatar
      perf: Remove pointless union that wraps the hw breakpoint fields · 189f202e
      Frederic Weisbecker authored
      It stands to anonymize a structure, but structures can already
      anonymize by themselves.
      Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
      189f202e