path: root/Documentation/kprobes.txt
diff options
authorMasami Hiramatsu <mhiramat@redhat.com>2009-01-06 14:41:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:21 -0800
commite8386a0cb22f4a2d439384212c494ad0bda848fe (patch)
tree84c462bccddead49c0e2c0dcfcc0f70cd9cf60f7 /Documentation/kprobes.txt
parent017c39bdb1b3ac1da6db339474a77b528043c05a (diff)
kprobes: support probing module __exit function
Allows kprobes to probe __exit routine. This adds flags member to struct kprobe. When module is freed(kprobes hooks module_notifier to get this event), kprobes which probe the functions in that module are set to "Gone" flag to the flags member. These "Gone" probes are never be enabled. Users can check the GONE flag through debugfs. This also removes mod_refcounted, because we couldn't free a module if kprobe incremented the refcount of that module. [akpm@linux-foundation.org: document some locking] [mhiramat@redhat.com: bugfix: pass aggr_kprobe to arch_remove_kprobe] [mhiramat@redhat.com: bugfix: release old_p's insn_slot before error return] Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/kprobes.txt')
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt
index a79633d702b..48b3de90eb1 100644
--- a/Documentation/kprobes.txt
+++ b/Documentation/kprobes.txt
@@ -497,7 +497,10 @@ The first column provides the kernel address where the probe is inserted.
The second column identifies the type of probe (k - kprobe, r - kretprobe
and j - jprobe), while the third column specifies the symbol+offset of
the probe. If the probed function belongs to a module, the module name
-is also specified.
+is also specified. Following columns show probe status. If the probe is on
+a virtual address that is no longer valid (module init sections, module
+virtual addresses that correspond to modules that've been unloaded),
+such probes are marked with [GONE].
/debug/kprobes/enabled: Turn kprobes ON/OFF