• Ananth N Mavinakayanahalli's avatar
    Kprobes: The ON/OFF knob thru debugfs · bf8f6e5b
    Ananth N Mavinakayanahalli authored
    This patch provides a debugfs knob to turn kprobes on/off
    o A new file /debug/kprobes/enabled indicates if kprobes is enabled or
      not (default enabled)
    o Echoing 0 to this file will disarm all installed probes
    o Any new probe registration when disabled will register the probe but
      not arm it. A message will be printed out in such a case.
    o When a value 1 is echoed to the file, all probes (including ones
      registered in the intervening period) will be enabled
    o Unregistration will happen irrespective of whether probes are globally
      enabled or not.
    o Update Documentation/kprobes.txt to reflect these changes. While there
      also update the doc to make it current.
    We are also looking at providing sysrq key support to tie to the disabling
    feature provided by this patch.
    [akpm@linux-foundation.org: Use bool like a bool!]
    [akpm@linux-foundation.org: add printk facility levels]
    [cornelia.huck@de.ibm.com: Add the missing arch_trampoline_kprobe() for s390]
    Signed-off-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
    Signed-off-by: default avatarSrinivasa DS <srinivasa@in.ibm.com>
    Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
kprobes.txt 23.2 KB