• Masami Hiramatsu's avatar
    perf probe: Support adding probes on offline kernel modules · 14a8fd7c
    Masami Hiramatsu authored
    Support adding probes on offline kernel modules. This enables
    perf-probe to trace kernel-module init functions via perf-probe.
    If user gives the path of module with -m option, perf-probe
    expects the module is offline.
    This feature works with --add, --funcs, and --vars.
    
    E.g)
     # perf probe -m /lib/modules/`uname -r`/kernel/fs/btrfs/btrfs.ko \
       -a "extent_io_init:5 extent_state_cache"
     Add new events:
       probe:extent_io_init (on extent_io_init:5 with extent_state_cache)
       probe:extent_io_init_1 (on extent_io_init:5 with extent_state_cache)
    
     You can now use it on all perf tools, such as:
    
             perf record -e probe:extent_io_init_1 -aR sleep 1
    Signed-off-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
    Link: http://lkml.kernel.org/r/20110627072751.6528.10230.stgit@fedora15Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    14a8fd7c
perf-probe.txt 6.65 KB