1. 09 May, 2012 14 commits
  2. 08 May, 2012 1 commit
    • Ingo Molnar's avatar
      Merge branch 'perf/annotate' of... · 149936a0
      Ingo Molnar authored
      Merge branch 'perf/annotate' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Perf annotate browser improvements:
      
       - Get back the line separating the overheads from the disassembly, requested by
         Peter Zijlstra, Linus agreed now that it is a solid line and more column real
         state was harvested. Also it has the jump->arrow lines separated from it by
         the address/jump target column.
      
       - Don't change asm line color when toggling source code view. Requested by
         Peter Zijlstra.
      
      Current snapshot:
      
       avtab_search_node
              │      push   %rbp
              │      mov    %rsp,%rbp
              │    → callq  mcount
              │      movzwl 0x6(%rsi),%edx
              │      and    $0x7fff,%dx
              │      test   %rdi,%rdi
              │    ↓ jne    20
         0.42 │17:┌─→xor    %eax,%eax
              │19:│  leaveq
         0.42 │   │← retq
              │   │  nopl   0x0(%rax,%rax,1)
              │20:│  mov    (%rdi),%rax
         0.08 │   │  test   %rax,%rax
              │   └──je     17
              │      movzwl (%rsi),%ecx
              │      movzwl 0x2(%rsi),%r9d
              │      movzwl 0x4(%rsi),%r8d
              │      movzwl %cx,%esi
              │      movzwl %r9w,%r10d
              │      shl    $0x9,%esi
              │      lea    (%rsi,%r10,4),%esi
              │      lea    (%r8,%rsi,1),%esi
              │      and    0x10(%rdi),%si
              │      movzwl %si,%esi
              │      mov    (%rax,%rsi,8),%rax
         1.01 │      test   %rax,%rax
              │    ↑ je     19
              │      nopw   0x0(%rax,%rax,1)
         3.19 │60:   cmp    %cx,(%rax)
              │    ↓ jne    7e
         0.08 │      cmp    %r9w,0x2(%rax)
              │    ↓ jne    7e
              │      cmp    %r8w,0x4(%rax)
              │    ↓ jne    79
              │      test   %dx,0x6(%rax)
              │    ↑ jne    19
              │79:   cmp    %r8w,0x4(%rax)
        83.45 │7e: ↑ ja     17
         3.36 │      mov    0x10(%rax),%rax
         7.98 │      test   %rax,%rax
              │    ↑ jne    60
              │      leaveq
              │    ← retq
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      149936a0
  3. 07 May, 2012 3 commits
  4. 04 May, 2012 1 commit
  5. 03 May, 2012 3 commits
  6. 28 Apr, 2012 2 commits
    • Steven Rostedt's avatar
      ftrace/x86: Remove the complex ftrace NMI handling code · 4a6d70c9
      Steven Rostedt authored
      As ftrace function tracing would require modifying code that could
      be executed in NMI context, which is not stopped with stop_machine(),
      ftrace had to do a complex algorithm with various stages of setup
      and memory barriers to make it work.
      
      With the new breakpoint method, this is no longer required. The changes
      to the code can be done without any problem in NMI context, as well as
      without stop machine altogether. Remove the complex code as it is
      no longer needed.
      
      Also, a lot of the notrace annotations could be removed from the
      NMI code as it is now safe to trace them. With the exception of
      do_nmi itself, which does some special work to handle running in
      the debug stack. The breakpoint method can cause NMIs to double
      nest the debug stack if it's not setup properly, and that is done
      in do_nmi(), thus that function must not be traced.
      
      (Note the arch sh may want to do the same)
      
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      4a6d70c9
    • Steven Rostedt's avatar
      ftrace/x86: Have arch x86_64 use breakpoints instead of stop machine · 08d636b6
      Steven Rostedt authored
      This method changes x86 to add a breakpoint to the mcount locations
      instead of calling stop machine.
      
      Now that iret can be handled by NMIs, we perform the following to
      update code:
      
      1) Add a breakpoint to all locations that will be modified
      
      2) Sync all cores
      
      3) Update all locations to be either a nop or call (except breakpoint
         op)
      
      4) Sync all cores
      
      5) Remove the breakpoint with the new code.
      
      6) Sync all cores
      
      [
        Added updates that Masami suggested:
         Use unlikely(modifying_ftrace_code) in int3 trap to keep kprobes efficient.
         Don't use NOTIFY_* in ftrace handler in int3 as it is not a notifier.
      ]
      
      Cc: H. Peter Anvin <hpa@zytor.com>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      08d636b6
  7. 27 Apr, 2012 6 commits
  8. 26 Apr, 2012 4 commits
  9. 25 Apr, 2012 6 commits