1. 06 12月, 2009 1 次提交
  2. 02 12月, 2009 7 次提交
  3. 01 12月, 2009 1 次提交
    • M
      trace_kprobes: Fix a memory leak bug and check kstrdup() return value · ba8665d7
      Masami Hiramatsu 提交于
      Fix a memory leak case in create_trace_probe(). When an argument
      is too long (> MAX_ARGSTR_LEN), it just jumps to error path. In
      that case tp->args[i].name is not released.
      This also fixes a bug to check kstrdup()'s return value.
      Signed-off-by: NMasami Hiramatsu <mhiramat@redhat.com>
      Cc: systemtap <systemtap@sources.redhat.com>
      Cc: DLE <dle-develop@lists.sourceforge.net>
      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: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <20091201001919.10235.56455.stgit@harusame>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      ba8665d7
  4. 27 11月, 2009 5 次提交
  5. 26 11月, 2009 2 次提交
  6. 25 11月, 2009 1 次提交
    • T
      trace/syscalls: Change ret param in struct syscall_trace_exit to long · 99df5a6a
      Tom Zanussi 提交于
      Commit ee949a86 ("tracing/syscalls:
      Use long for syscall ret format and field definitions") changed the
      syscall exit return type to long, but forgot to change it in the
      struct.
      Signed-off-by: NTom Zanussi <tzanussi@gmail.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <1259133299-23594-3-git-send-email-tzanussi@gmail.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      99df5a6a
  7. 23 11月, 2009 1 次提交
  8. 22 11月, 2009 2 次提交
    • F
      tracing: Forget about the NMI buffer for syscall events · 28889bf9
      Frederic Weisbecker 提交于
      We are never in an NMI context when we commit a syscall trace to
      perf. So just forget about the nmi buffer there.
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jason Baron <jbaron@redhat.com>
      LKML-Reference: <1258863695-10464-2-git-send-email-fweisbec@gmail.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      28889bf9
    • F
      tracing: Use the perf recursion protection from trace event · ce71b9df
      Frederic Weisbecker 提交于
      When we commit a trace to perf, we first check if we are
      recursing in the same buffer so that we don't mess-up the buffer
      with a recursing trace. But later on, we do the same check from
      perf to avoid commit recursion. The recursion check is desired
      early before we touch the buffer but we want to do this check
      only once.
      
      Then export the recursion protection from perf and use it from
      the trace events before submitting a trace.
      
      v2: Put appropriate Reported-by tag
      Reported-by: NPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Cc: Jason Baron <jbaron@redhat.com>
      LKML-Reference: <1258864015-10579-1-git-send-email-fweisbec@gmail.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      ce71b9df
  9. 10 11月, 2009 1 次提交
    • P
      ksym_tracer: Support read accesses independent of read/write. · 676c0dbe
      Paul Mundt 提交于
      All of the infrastructure already exists to support read accesses
      for platforms that support a read access independently of read/write
      (such as in the case of the SuperH UBC). This just trivially hooks
      up the read case by itself.
      Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Prasad <prasad@linux.vnet.ibm.com>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Jan Kiszka <jan.kiszka@web.de>
      Cc: Jiri Slaby <jirislaby@gmail.com>
      Cc: Avi Kivity <avi@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      LKML-Reference: <20091109083733.GA25848@linux-sh.org>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      676c0dbe
  10. 08 11月, 2009 3 次提交
    • L
      ksym_tracer: Remove KSYM_SELFTEST_ENTRY · 30ff21e3
      Li Zefan 提交于
      The macro used to be used in both trace_selftest.c and
      trace_ksym.c, but no longer, so remove it from header file.
      Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
      Cc: Prasad <prasad@linux.vnet.ibm.com>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      30ff21e3
    • F
      hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events · 24f1e32c
      Frederic Weisbecker 提交于
      This patch rebase the implementation of the breakpoints API on top of
      perf events instances.
      
      Each breakpoints are now perf events that handle the
      register scheduling, thread/cpu attachment, etc..
      
      The new layering is now made as follows:
      
             ptrace       kgdb      ftrace   perf syscall
                \          |          /         /
                 \         |         /         /
                                              /
                  Core breakpoint API        /
                                            /
                           |               /
                           |              /
      
                    Breakpoints perf events
      
                           |
                           |
      
                     Breakpoints PMU ---- Debug Register constraints handling
                                          (Part of core breakpoint API)
                           |
                           |
      
                   Hardware debug registers
      
      Reasons of this rewrite:
      
      - Use the centralized/optimized pmu registers scheduling,
        implying an easier arch integration
      - More powerful register handling: perf attributes (pinned/flexible
        events, exclusive/non-exclusive, tunable period, etc...)
      
      Impact:
      
      - New perf ABI: the hardware breakpoints counters
      - Ptrace breakpoints setting remains tricky and still needs some per
        thread breakpoints references.
      
      Todo (in the order):
      
      - Support breakpoints perf counter events for perf tools (ie: implement
        perf_bpcounter_event())
      - Support from perf tools
      
      Changes in v2:
      
      - Follow the perf "event " rename
      - The ptrace regression have been fixed (ptrace breakpoint perf events
        weren't released when a task ended)
      - Drop the struct hw_breakpoint and store generic fields in
        perf_event_attr.
      - Separate core and arch specific headers, drop
        asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h
      - Use new generic len/type for breakpoint
      - Handle off case: when breakpoints api is not supported by an arch
      
      Changes in v3:
      
      - Fix broken CONFIG_KVM, we need to propagate the breakpoint api
        changes to kvm when we exit the guest and restore the bp registers
        to the host.
      
      Changes in v4:
      
      - Drop the hw_breakpoint_restore() stub as it is only used by KVM
      - EXPORT_SYMBOL_GPL hw_breakpoint_restore() as KVM can be built as a
        module
      - Restore the breakpoints unconditionally on kvm guest exit:
        TIF_DEBUG_THREAD doesn't anymore cover every cases of running
        breakpoints and vcpu->arch.switch_db_regs might not always be
        set when the guest used debug registers.
        (Waiting for a reliable optimization)
      
      Changes in v5:
      
      - Split-up the asm-generic/hw-breakpoint.h moving to
        linux/hw_breakpoint.h into a separate patch
      - Optimize the breakpoints restoring while switching from kvm guest
        to host. We only want to restore the state if we have active
        breakpoints to the host, otherwise we don't care about messed-up
        address registers.
      - Add asm/hw_breakpoint.h to Kbuild
      - Fix bad breakpoint type in trace_selftest.c
      
      Changes in v6:
      
      - Fix wrong header inclusion in trace.h (triggered a build
        error with CONFIG_FTRACE_SELFTEST
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Prasad <prasad@linux.vnet.ibm.com>
      Cc: Alan Stern <stern@rowland.harvard.edu>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Jan Kiszka <jan.kiszka@web.de>
      Cc: Jiri Slaby <jirislaby@gmail.com>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Avi Kivity <avi@redhat.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      24f1e32c
    • F
      tracing, perf_events: Protect the buffer from recursion in perf · 444a2a3b
      Frederic Weisbecker 提交于
      While tracing using events with perf, if one enables the
      lockdep:lock_acquire event, it will infect every other perf
      trace events.
      
      Basically, you can enable whatever set of trace events through
      perf but if this event is part of the set, the only result we
      can get is a long list of lock_acquire events of rcu read lock,
      and only that.
      
      This is because of a recursion inside perf.
      
      1) When a trace event is triggered, it will fill a per cpu
         buffer and submit it to perf.
      
      2) Perf will commit this event but will also protect some data
         using rcu_read_lock
      
      3) A recursion appears: rcu_read_lock triggers a lock_acquire
         event that will fill the per cpu event and then submit the
         buffer to perf.
      
      4) Perf detects a recursion and ignores it
      
      5) Perf continues its work on the previous event, but its buffer
         has been overwritten by the lock_acquire event, it has then
         been turned into a lock_acquire event of rcu read lock
      
      Such scenario also happens with lock_release with
      rcu_read_unlock().
      
      We could turn the rcu_read_lock() into __rcu_read_lock() to drop
      the lock debugging from perf fast path, but that would make us
      lose the rcu debugging and that doesn't prevent from other
      possible kind of recursion from perf in the future.
      
      This patch adds a recursion protection based on a counter on the
      perf trace per cpu buffers to solve the problem.
      
      -v2: Fixed lost whitespace, added reviewed-by tag
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Reviewed-by: NMasami Hiramatsu <mhiramat@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Jason Baron <jbaron@redhat.com>
      LKML-Reference: <1257477185-7838-1-git-send-email-fweisbec@gmail.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      444a2a3b
  11. 04 11月, 2009 3 次提交
  12. 29 10月, 2009 2 次提交
    • L
      tracing/filters: Fix to make system filter work · 3ed67776
      Li Zefan 提交于
      commit fce29d15
      ("tracing/filters: Refactor subsystem filter code")
      broke system filter accidentally.
      Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      LKML-Reference: <4AE810BD.3070009@cn.fujitsu.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3ed67776
    • M
      kprobe-tracer: Compare both of event-name and event-group to find probe · dd004c47
      Masami Hiramatsu 提交于
      Fix find_probe_event() to compare both of event-name and
      event-group. Without this fix, kprobe-tracer overwrites existing
      same event-name probe even if its group-name is different.
      Signed-off-by: NMasami 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>
      LKML-Reference: <20091027204244.30545.27516.stgit@harusame>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      dd004c47
  13. 24 10月, 2009 4 次提交
  14. 17 10月, 2009 2 次提交
  15. 15 10月, 2009 5 次提交
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