• M
    perf annotate: Properly interpret indirect call · 1dc27f63
    Martin Liška 提交于
    The patch changes the parsing of:
    
    	callq  *0x8(%rbx)
    
    from:
    
      0.26 │     → callq  *8
    
    to:
    
      0.26 │     → callq  *0x8(%rbx)
    
    in this case an address is followed by a register, thus one can't parse
    only the address.
    
    Committer testing:
    
    1) run 'perf record sleep 10'
    2) before applying the patch, run:
    
         perf annotate --stdio2 > /tmp/before
    
    3) after applying the patch, run:
    
         perf annotate --stdio2 > /tmp/after
    
    4) diff /tmp/before /tmp/after:
      --- /tmp/before 2018-08-28 11:16:03.238384143 -0300
      +++ /tmp/after  2018-08-28 11:15:39.335341042 -0300
      @@ -13274,7 +13274,7 @@
                    ↓ jle    128
                      hash_value = hash_table->hash_func (key);
                      mov    0x8(%rsp),%rdi
      -  0.91       → callq  *30
      +  0.91       → callq  *0x30(%r12)
                      mov    $0x2,%r8d
                      cmp    $0x2,%eax
                      node_hash = hash_table->hashes[node_index];
      @@ -13848,7 +13848,7 @@
                       mov    %r14,%rdi
                       sub    %rbx,%r13
                       mov    %r13,%rdx
      -              → callq  *38
      +              → callq  *0x38(%r15)
                       cmp    %rax,%r13
         1.91        ↓ je     240
                1b4:   mov    $0xffffffff,%r13d
      @@ -14026,7 +14026,7 @@
                       mov    %rcx,-0x500(%rbp)
                       mov    %r15,%rsi
                       mov    %r14,%rdi
      -              → callq  *38
      +              → callq  *0x38(%rax)
                       mov    -0x500(%rbp),%rcx
                       cmp    %rax,%rcx
                     ↓ jne    9b0
    <SNIP tons of other such cases>
    Signed-off-by: NMartin Liška <mliska@suse.cz>
    Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    Tested-by: NKim Phillips <kim.phillips@arm.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Link: http://lkml.kernel.org/r/bd1f3932-be2b-85f9-7582-111ee0a43b07@suse.czSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
    1dc27f63
annotate.c 68.8 KB