• Arnaldo Carvalho de Melo's avatar
    perf report: Add --symbols parameter · 7bec7a91
    Arnaldo Carvalho de Melo authored
    So that we can filter by symbol name.
    
    The 'pfunct' utility in the 'dwarves' package can be used to
    create a file with the functions one wants.
    
    Example:
    
    [acme@doppio pahole]$ pfunct /usr/lib/debug/usr/lib64/libdw-0.141.so.debug | grep dwarf > /tmp/dwarf.symbols
    [acme@doppio pahole]$ wc -l /tmp/dwarf.symbols
    93 /tmp/dwarf.symbols
    [acme@doppio pahole]$ head -3 /tmp/dwarf.symbols
    dwfl_addrdwarf
    dwfl_module_getdwarf
    dwfl_getdwarf
    [acme@doppio pahole]$ perf report --sort comm,dso,symbol --comms pahole --dsos /usr/lib64/libdw-0.141.so --symbols file:///tmp/dwarf.symbols
    
        33.99%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_tag
        29.07%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_decl_file
        27.71%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_getsrclines
         4.54%            pahole  /usr/lib64/libdw-0.141.so  0x00000000007400
         3.93%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_decl_line
         0.46%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_getlocation
         0.18%            pahole  /usr/lib64/libdw-0.141.so  [.] __libdwarf_next_prime
         0.13%            pahole  /usr/lib64/libdw-0.141.so  [.] dwarf_diecu
    
    [acme@doppio pahole]$
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <1246399282-20934-4-git-send-email-acme@redhat.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    7bec7a91
perf-report.txt 721 Bytes