1. 13 Sep, 2010 3 commits
  2. 10 Sep, 2010 2 commits
  3. 09 Sep, 2010 23 commits
    • Frederic Weisbecker's avatar
      irq: Fix circular headers dependency · 3b8fad3e
      Frederic Weisbecker authored
      asm-generic/hardirq.h needs asm/irq.h which might include
      linux/interrupt.h as in the sparc 32 case. At this point
      we need irq_cpustat generic definitions, but those are
      included later in asm-generic/hardirq.h.
      
      Then delay a bit the inclusion of irq.h from
      asm-generic/hardirq.h, it doesn't need to be included early.
      
      This fixes:
      
       include/linux/interrupt.h: In function '__raise_softirq_irqoff':
       include/linux/interrupt.h:414: error: implicit declaration of function 'local_softirq_pending'
       include/linux/interrupt.h:414: error: lvalue required as left operand of assignment
      Reported-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
      Cc: mathieu.desnoyers@efficios.com
      Cc: rostedt@goodmis.org
      Cc: nhorman@tuxdriver.com
      Cc: scott.a.mcmillan@intel.com
      Cc: eric.dumazet@gmail.com
      Cc: kaneshige.kenji@jp.fujitsu.com
      Cc: davem@davemloft.net
      Cc: izumi.taku@jp.fujitsu.com
      Cc: kosaki.motohiro@jp.fujitsu.com
      LKML-Reference: <20100908122557.GA5310@nowhere>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      3b8fad3e
    • Peter Zijlstra's avatar
      perf: Fix up delayed_put_task_struct() · 4e231c79
      Peter Zijlstra authored
      I missed a perf_event_ctxp user when converting it to an array. Pull this
      last user into perf_event.c as well and fix it up.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      4e231c79
    • Peter Zijlstra's avatar
      perf: Optimize context ops · 1b9a644f
      Peter Zijlstra authored
      Assuming we don't mix events of different pmus onto a single context
      (with the exeption of software events inside a hardware group) we can
      now assume that all events on a particular context belong to the same
      pmu, hence we can disable the pmu for the entire context operations.
      
      This reduces the amount of hardware writes.
      
      The exception for swevents comes from the fact that the sw pmu disable
      is a nop.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1b9a644f
    • Peter Zijlstra's avatar
      perf: Provide a separate task context for swevents · 89a1e187
      Peter Zijlstra authored
      Since software events are always schedulable, mixing them up with
      hardware events (who are not) can lead to funny scheduling oddities.
      
      Giving them their own context solves this.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      89a1e187
    • Peter Zijlstra's avatar
      perf: Multiple task contexts · 8dc85d54
      Peter Zijlstra authored
      Provide the infrastructure for multiple task contexts.
      
      A more flexible approach would have resulted in more pointer chases
      in the scheduling hot-paths. This approach has the limitation of a
      static number of task contexts.
      
      Since I expect most external PMUs to be system wide, or at least node
      wide (as per the intel uncore unit) they won't actually need a task
      context.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      8dc85d54
    • Peter Zijlstra's avatar
      perf: Clean up perf_event_context allocation · eb184479
      Peter Zijlstra authored
      Unify the two perf_event_context allocation sites.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      eb184479
    • Peter Zijlstra's avatar
      perf: Move some code around · 97dee4f3
      Peter Zijlstra authored
      Move all inherit code near each other.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      97dee4f3
    • Peter Zijlstra's avatar
      perf: Per-pmu-per-cpu contexts · 108b02cf
      Peter Zijlstra authored
      Allocate per-cpu contexts per pmu.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      108b02cf
    • Peter Zijlstra's avatar
      perf: Per cpu-context rotation timer · b5ab4cd5
      Peter Zijlstra authored
      Give each cpu-context its own timer so that it is a self contained
      entity, this eases the way for per-pmu-per-cpu contexts as well as
      provides the basic infrastructure to allow different rotation
      times per pmu.
      
      Things to look at:
       - folding the tick and these TICK_NSEC timers
       - separate task context rotation
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      b5ab4cd5
    • Peter Zijlstra's avatar
      perf: Remove the swevent hash-table from the cpu context · b28ab83c
      Peter Zijlstra authored
      Separate the swevent hash-table from the cpu_context bits in
      preparation for per pmu cpu contexts.
      
      This keeps the swevent hash a global entity.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      b28ab83c
    • Peter Zijlstra's avatar
      perf: Separate find_get_context() from event initialization · c3f00c70
      Peter Zijlstra authored
      Separate find_get_context() from the event allocation and
      initialization so that we may make find_get_context() depend
      on the event pmu in a later patch.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      c3f00c70
    • Peter Zijlstra's avatar
      perf: Remove the sysfs bits · 15ac9a39
      Peter Zijlstra authored
      Neither the overcommit nor the reservation sysfs parameter were
      actually working, remove them as they'll only get in the way.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      15ac9a39
    • Peter Zijlstra's avatar
      perf: Rework the PMU methods · a4eaf7f1
      Peter Zijlstra authored
      Replace pmu::{enable,disable,start,stop,unthrottle} with
      pmu::{add,del,start,stop}, all of which take a flags argument.
      
      The new interface extends the capability to stop a counter while
      keeping it scheduled on the PMU. We replace the throttled state with
      the generic stopped state.
      
      This also allows us to efficiently stop/start counters over certain
      code paths (like IRQ handlers).
      
      It also allows scheduling a counter without it starting, allowing for
      a generic frozen state (useful for rotating stopped counters).
      
      The stopped state is implemented in two different ways, depending on
      how the architecture implemented the throttled state:
      
       1) We disable the counter:
          a) the pmu has per-counter enable bits, we flip that
          b) we program a NOP event, preserving the counter state
      
       2) We store the counter state and ignore all read/overflow events
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a4eaf7f1
    • Peter Zijlstra's avatar
      perf: Shrink hw_perf_event · fa407f35
      Peter Zijlstra authored
      Use hw_perf_event::period_left instead of hw_perf_event::remaining
      and win back 8 bytes.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      fa407f35
    • Peter Zijlstra's avatar
      perf: Default PMU ops · ad5133b7
      Peter Zijlstra authored
      Provide default implementations for the pmu txn methods, this
      allows us to remove some conditional code.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      ad5133b7
    • Peter Zijlstra's avatar
      perf: Per PMU disable · 33696fc0
      Peter Zijlstra authored
      Changes perf_disable() into perf_pmu_disable().
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      33696fc0
    • Peter Zijlstra's avatar
      perf: Reduce perf_disable() usage · 24cd7f54
      Peter Zijlstra authored
      Since the current perf_disable() usage is only an optimization,
      remove it for now. This eases the removal of the __weak
      hw_perf_enable() interface.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      24cd7f54
    • Peter Zijlstra's avatar
      perf: Unindent labels · 9ed6060d
      Peter Zijlstra authored
      Fixup random annoying style bits.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      9ed6060d
    • Peter Zijlstra's avatar
      perf: Register PMU implementations · b0a873eb
      Peter Zijlstra authored
      Simple registration interface for struct pmu, this provides the
      infrastructure for removing all the weak functions.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      b0a873eb
    • Peter Zijlstra's avatar
      perf: Deconstify struct pmu · 51b0fe39
      Peter Zijlstra authored
      sed -ie 's/const struct pmu\>/struct pmu/g' `git grep -l "const struct pmu\>"`
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      Cc: stephane eranian <eranian@googlemail.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Cyrill Gorcunov <gorcunov@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Yanmin <yanmin_zhang@linux.intel.com>
      Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Michael Cree <mcree@orcon.net.nz>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      51b0fe39
    • Ingo Molnar's avatar
      Merge branch 'perf/urgent' into perf/core · 2aa61274
      Ingo Molnar authored
      Merge reason: Pick up pending fixes before applying dependent new changes.
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      2aa61274
    • Peter Zijlstra's avatar
      perf: Fix CPU hotplug · 5e11637e
      Peter Zijlstra authored
      Since we have UP_PREPARE, we should also have UP_CANCELED.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: paulus <paulus@samba.org>
      LKML-Reference: <new-submission>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      5e11637e
    • Li Zefan's avatar
      perf, trace: Fix module leak · 9cb627d5
      Li Zefan authored
      Commit 1c024eca (perf, trace: Optimize tracepoints by using
      per-tracepoint-per-cpu hlist to track events) caused a module
      refcount leak.
      Reported-And-Tested-by: default avatarAvi Kivity <avi@redhat.com>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      LKML-Reference: <4C7E1F12.8030304@cn.fujitsu.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      9cb627d5
  4. 08 Sep, 2010 6 commits
    • Masami Hiramatsu's avatar
      tracing/kprobe: Fix handling of C-unlike argument names · da34634f
      Masami Hiramatsu authored
      Check the argument name whether it is invalid (not C-like symbol name). This
      makes event format simple.
      Reported-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      LKML-Reference: <20100827113912.22882.62313.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      da34634f
    • Masami Hiramatsu's avatar
      tracing/kprobes: Fix handling of argument names · aba91595
      Masami Hiramatsu authored
      Set "argN" name for each argument automatically if it has no specified name.
      Since dynamic trace event(kprobe_events) accepts special characters for its
      argument, its format can show those special characters (e.g. '$', '%', '+').
      However, perf can't parse those format because of the character (especially
      '%') mess up the format.  This sets "argX" name for those arguments if user
      omitted the argument names.
      
      E.g.
       # echo 'p do_fork %ax IP=%ip $stack' > tracing/kprobe_events
       # cat tracing/kprobe_events
       p:kprobes/p_do_fork_0 do_fork arg1=%ax IP=%ip arg3=$stack
      Reported-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      LKML-Reference: <20100827113906.22882.59312.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      aba91595
    • Masami Hiramatsu's avatar
      perf probe: Fix handling of arguments names · 367e94c1
      Masami Hiramatsu authored
      Don't make argument names from raw parameters (means the parameters are written
      in kprobe-tracer syntax), because the argument syntax may include special
      characters.  Just leave it, then kprobe-tracer gives a new name.
      Reported-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
      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@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <20100827113859.22882.75598.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      367e94c1
    • Masami Hiramatsu's avatar
      perf probe: Fix return probe support · 04ddd04b
      Masami Hiramatsu authored
      Fix a bug to support %return probe syntax again. Previous commit 4235b045 has a
      bug which disables the %return syntax on perf probe.
      
      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@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <20100827113852.22882.87447.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      04ddd04b
    • Masami Hiramatsu's avatar
      tracing/kprobe: Fix a memory leak in error case · 61a52736
      Masami Hiramatsu authored
      Fix a memory leak which happens when a field name conflicts with others. In
      error case, free_trace_probe() will free all arguments until nr_args, so this
      increments nr_args the begining of the loop instead of the end.
      
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      LKML-Reference: <20100827113846.22882.12670.stgit@ltc236.sdl.hitachi.co.jp>
      Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      61a52736
    • Steven Rostedt's avatar
      tracing: Do not allow llseek to set_ftrace_filter · 9c55cb12
      Steven Rostedt authored
      Reading the file set_ftrace_filter does three things.
      
      1) shows whether or not filters are set for the function tracer
      2) shows what functions are set for the function tracer
      3) shows what triggers are set on any functions
      
      3 is independent from 1 and 2.
      
      The way this file currently works is that it is a state machine,
      and as you read it, it may change state. But this assumption breaks
      when you use lseek() on the file. The state machine gets out of sync
      and the t_show() may use the wrong pointer and cause a kernel oops.
      
      Luckily, this will only kill the app that does the lseek, but the app
      dies while holding a mutex. This prevents anyone else from using the
      set_ftrace_filter file (or any other function tracing file for that matter).
      
      A real fix for this is to rewrite the code, but that is too much for
      a -rc release or stable. This patch simply disables llseek on the
      set_ftrace_filter() file for now, and we can do the proper fix for the
      next major release.
      Reported-by: default avatarRobert Swiecki <swiecki@google.com>
      Cc: Chris Wright <chrisw@sous-sol.org>
      Cc: Tavis Ormandy <taviso@google.com>
      Cc: Eugene Teo <eugene@redhat.com>
      Cc: vendor-sec@lst.de
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      9c55cb12
  5. 07 Sep, 2010 5 commits
    • Koki Sanagi's avatar
      perf: Add a script to show packets processing · 359d5106
      Koki Sanagi authored
      Add a perf script which shows packets processing and processed
      time. It helps us to investigate networking or network devices.
      
      If you want to use it, install perf and record perf.data like
      following.
      
      If you set script, perf gathers records until it ends.
      If not, you must Ctrl-C to stop recording.
      
      And if you want a report from record,
      
      If you use some options, you can limit the output.
      Option is below.
      
      tx: show only tx packets processing
      rx: show only rx packets processing
      dev=: show processing on this device
      debug: work with debug mode. It shows buffer status.
      
      For example, if you want to show received packets processing
      associated with eth4,
      
      106133.171439sec cpu=0
        irq_entry(+0.000msec irq=24:eth4)
               |
        softirq_entry(+0.006msec)
               |
               |---netif_receive_skb(+0.010msec skb=f2d15900 len=100)
               |            |
               |      skb_copy_datagram_iovec(+0.039msec 10291::10291)
               |
        napi_poll_exit(+0.022msec eth4)
      
      This perf script helps us to analyze the processing time of a
      transmit/receive sequence.
      Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Cc: Neil Horman <nhorman@tuxdriver.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
      Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
      Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      LKML-Reference: <4C72439D.3040001@jp.fujitsu.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      359d5106
    • Koki Sanagi's avatar
      skb: Add tracepoints to freeing skb · 07dc22e7
      Koki Sanagi authored
      This patch adds tracepoint to consume_skb and add trace_kfree_skb
      before __kfree_skb in skb_free_datagram_locked and net_tx_action.
      Combinating with tracepoint on dev_hard_start_xmit, we can check
      how long it takes to free transmitted packets. And using it, we can
      calculate how many packets driver had at that time. It is useful when
      a drop of transmitted packet is a problem.
      
                  sshd-6828  [000] 112689.258154: consume_skb: skbaddr=f2d99bb8
      Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
      Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
      Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      LKML-Reference: <4C724364.50903@jp.fujitsu.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      07dc22e7
    • Koki Sanagi's avatar
      netdev: Add tracepoints to netdev layer · cf66ba58
      Koki Sanagi authored
      This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit,
      netif_rx and netif_receive_skb. These tracepoints help you to monitor
      network driver's input/output.
      
                <idle>-0     [001] 112447.902030: netif_rx: dev=eth1 skbaddr=f3ef0900 len=84
                <idle>-0     [001] 112447.902039: netif_receive_skb: dev=eth1 skbaddr=f3ef0900 len=84
                  sshd-6828  [000] 112447.903257: net_dev_queue: dev=eth4 skbaddr=f3fca538 len=226
                  sshd-6828  [000] 112447.903260: net_dev_xmit: dev=eth4 skbaddr=f3fca538 len=226 rc=0
      Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
      Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
      Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      LKML-Reference: <4C72431E.3000901@jp.fujitsu.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      cf66ba58
    • Neil Horman's avatar
      napi: Convert trace_napi_poll to TRACE_EVENT · 3e4b10d7
      Neil Horman authored
      This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT
      to improve the usability of napi_poll tracepoint.
      
                <idle>-0     [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
                <idle>-0     [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1
      
      The original patch is below:
      http://marc.info/?l=linux-kernel&m=126021713809450&w=2
      
      [ sanagi.koki@jp.fujitsu.com: And add a fix by Steven Rostedt:
      http://marc.info/?l=linux-kernel&m=126150506519173&w=2 ]
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
      Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
      Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      LKML-Reference: <4C7242D7.4050009@jp.fujitsu.com>
      Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      3e4b10d7
    • Lai Jiangshan's avatar
      irq: Add tracepoint to softirq_raise · 2bf2160d
      Lai Jiangshan authored
      Add a tracepoint for tracing when softirq action is raised.
      
      This and the existing tracepoints complete softirq's tracepoints:
      softirq_raise, softirq_entry and softirq_exit.
      
      And when this tracepoint is used in combination with
      the softirq_entry tracepoint we can determine
      the softirq raise latency.
      Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
      Acked-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Cc: David Miller <davem@davemloft.net>
      Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
      Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
      Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      LKML-Reference: <4C724298.4050509@jp.fujitsu.com>
      [ factorize softirq events with DECLARE_EVENT_CLASS ]
      Signed-off-by: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      2bf2160d
  6. 03 Sep, 2010 1 commit
    • Robert Richter's avatar
      perf, x86: Try to handle unknown nmis with an enabled PMU · 4177c42a
      Robert Richter authored
      When the PMU is enabled it is valid to have unhandled nmis, two
      events could trigger 'simultaneously' raising two back-to-back
      NMIs. If the first NMI handles both, the latter will be empty
      and daze the CPU.
      
      The solution to avoid an 'unknown nmi' massage in this case was
      simply to stop the nmi handler chain when the PMU is enabled by
      stating the nmi was handled. This has the drawback that a) we
      can not detect unknown nmis anymore, and b) subsequent nmi
      handlers are not called.
      
      This patch addresses this. Now, we check this unknown NMI if it
      could be a PMU back-to-back NMI. Otherwise we pass it and let
      the kernel handle the unknown nmi.
      
      This is a debug log:
      
       cpu #6, nmi #32333, skip_nmi #32330, handled = 1, time = 1934364430
       cpu #6, nmi #32334, skip_nmi #32330, handled = 1, time = 1934704616
       cpu #6, nmi #32335, skip_nmi #32336, handled = 2, time = 1936032320
       cpu #6, nmi #32336, skip_nmi #32336, handled = 0, time = 1936034139
       cpu #6, nmi #32337, skip_nmi #32336, handled = 1, time = 1936120100
       cpu #6, nmi #32338, skip_nmi #32336, handled = 1, time = 1936404607
       cpu #6, nmi #32339, skip_nmi #32336, handled = 1, time = 1937983416
       cpu #6, nmi #32340, skip_nmi #32341, handled = 2, time = 1938201032
       cpu #6, nmi #32341, skip_nmi #32341, handled = 0, time = 1938202830
       cpu #6, nmi #32342, skip_nmi #32341, handled = 1, time = 1938443743
       cpu #6, nmi #32343, skip_nmi #32341, handled = 1, time = 1939956552
       cpu #6, nmi #32344, skip_nmi #32341, handled = 1, time = 1940073224
       cpu #6, nmi #32345, skip_nmi #32341, handled = 1, time = 1940485677
       cpu #6, nmi #32346, skip_nmi #32347, handled = 2, time = 1941947772
       cpu #6, nmi #32347, skip_nmi #32347, handled = 1, time = 1941949818
       cpu #6, nmi #32348, skip_nmi #32347, handled = 0, time = 1941951591
       Uhhuh. NMI received for unknown reason 00 on CPU 6.
       Do you have a strange power saving mode enabled?
       Dazed and confused, but trying to continue
      
      Deltas:
      
       nmi #32334 340186
       nmi #32335 1327704
       nmi #32336 1819      <<<< back-to-back nmi [1]
       nmi #32337 85961
       nmi #32338 284507
       nmi #32339 1578809
       nmi #32340 217616
       nmi #32341 1798      <<<< back-to-back nmi [2]
       nmi #32342 240913
       nmi #32343 1512809
       nmi #32344 116672
       nmi #32345 412453
       nmi #32346 1462095   <<<< 1st nmi (standard) handling 2 counters
       nmi #32347 2046      <<<< 2nd nmi (back-to-back) handling one
       counter nmi #32348 1773      <<<< 3rd nmi (back-to-back)
       handling no counter! [3]
      
      For  back-to-back nmi detection there are the following rules:
      
      The PMU nmi handler was handling more than one counter and no
      counter was handled in the subsequent nmi (see [1] and [2]
      above).
      
      There is another case if there are two subsequent back-to-back
      nmis [3]. The 2nd is detected as back-to-back because the first
      handled more than one counter. If the second handles one counter
      and the 3rd handles nothing, we drop the 3rd nmi because it
      could be a back-to-back nmi.
      Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      [ renamed nmi variable to pmu_nmi to avoid clash with .nmi in entry.S ]
      Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
      Cc: peterz@infradead.org
      Cc: gorcunov@gmail.com
      Cc: fweisbec@gmail.com
      Cc: ying.huang@intel.com
      Cc: ming.m.lin@intel.com
      Cc: eranian@google.com
      LKML-Reference: <1283454469-1909-3-git-send-email-dzickus@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      4177c42a