• Don Zickus's avatar
    perf tools: Add dcacheline sort · 9b32ba71
    Don Zickus authored
    In perf's 'mem-mode', one can get access to a whole bunch of details specific to a
    particular sample instruction.  A bunch of those details relate to the data
    address.
    
    One interesting thing you can do with data addresses is to convert them into a unique
    cacheline they belong too.  Organizing these data cachelines into similar groups and sorting
    them can reveal cache contention.
    
    This patch creates an alogorithm based on various sample details that can help group
    entries together into data cachelines and allows 'perf report' to sort on it.
    
    The algorithm relies on having proper mmap2 support in the kernel to help determine
    if the memory map the data address belongs to is private to a pid or globally shared.
    
    The alogortithm is as follows:
    
    o group cpumodes together
    o group entries with discovered maps together
    o sort on major, minor, inode and inode generation numbers
    o if userspace anon, then sort on pid
    o sort on cachelines based on data addresses
    
    The 'dcacheline' sort option in 'perf report' only works in 'mem-mode'.
    
    Sample output:
    
     #
     # Samples: 206  of event 'cpu/mem-loads/pp'
     # Total weight : 2534
     # Sort order   : dcacheline,pid
     #
     # Overhead       Samples                                                          Data Cacheline       Command:  Pid
     # ........  ............  ......................................................................  ..................
     #
        13.22%             1  [k] 0xffff88042f08ebc0                                                       swapper:    0
         9.27%             1  [k] 0xffff88082e8cea80                                                       swapper:    0
         3.59%             2  [k] 0xffffffff819ba180                                                       swapper:    0
         0.32%             1  [k] arch_trigger_all_cpu_backtrace_handler_na.23901+0xffffffffffffffe0       swapper:    0
         0.32%             1  [k] timekeeper_seq+0xfffffffffffffff8                                        swapper:    0
    
    Note:  Added a '+1' to symlen size in hists__calc_col_len to prevent the next column
    from prematurely tabbing over and mis-aligning.  Not sure what the problem is.
    Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
    Link: http://lkml.kernel.org/r/1401208087-181977-8-git-send-email-dzickus@redhat.comSigned-off-by: default avatarJiri Olsa <jolsa@kernel.org>
    9b32ba71
hist.h 10.2 KB