• Namhyung Kim's avatar
    perf lock contention: Add -S/--callstack-filter option · 7b204399
    Namhyung Kim authored
    The -S/--callstack-filter is to limit display entries having the given
    string in the callstack (not only in the caller in the output).
    
    The following example shows lock contention results if the callstack
    has 'net' substring somewhere.  Note that the caller '__dev_queue_xmit'
    does not match to it, but it has 'inet6_csk_xmit' in the callstack.
    
    This applies even if you don't use -v option to show the full callstack.
    
      $ sudo ./perf lock con -abv -S net sleep 1
      ...
       contended   total wait     max wait     avg wait         type   caller
    
               5     70.20 us     16.13 us     14.04 us     spinlock   __dev_queue_xmit+0xb6d
                              0xffffffffa5dd1c60  _raw_spin_lock+0x30
                              0xffffffffa5b8f6ed  __dev_queue_xmit+0xb6d
                              0xffffffffa5cd8267  ip6_finish_output2+0x2c7
                              0xffffffffa5cdac14  ip6_finish_output+0x1d4
                              0xffffffffa5cdb477  ip6_xmit+0x457
                              0xffffffffa5d1fd17  inet6_csk_xmit+0xd7
                              0xffffffffa5c5f4aa  __tcp_transmit_skb+0x54a
                              0xffffffffa5c6467d  tcp_keepalive_timer+0x2fd
    Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Ian Rogers <irogers@google.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Song Liu <song@kernel.org>
    Cc: bpf@vger.kernel.org
    Link: https://lore.kernel.org/r/20230126000936.3017683-1-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    7b204399
perf-lock.txt 4.78 KB