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authorMasami Hiramatsu <mhiramat@redhat.com>2008-04-28 02:14:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:32 -0700
commit3b0cb4caefeca6fe6b05c6c5a76e9c633b44c58f (patch)
treecf7072f0a2a3f53b1eb36b23c17db8d4a74369c9 /Documentation/kprobes.txt
parent26b31c1908e02a316edfba08080373342e662c14 (diff)
downloadlinux-linaro-android-3b0cb4caefeca6fe6b05c6c5a76e9c633b44c58f.tar.gz
kprobes: update document about batch registration
Add the description of batch registration interfaces to Documentation/kprobes.txt. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Cc: Shaohua Li <shaohua.li@intel.com> Cc: David Miller <davem@davemloft.net> Cc: "Frank Ch. Eigler" <fche@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')
-rw-r--r--Documentation/kprobes.txt51
1 files changed, 47 insertions, 4 deletions
diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt
index be89f393274..6877e718711 100644
--- a/Documentation/kprobes.txt
+++ b/Documentation/kprobes.txt
@@ -37,6 +37,11 @@ registration function such as register_kprobe() specifies where
the probe is to be inserted and what handler is to be called when
the probe is hit.
+There are also register_/unregister_*probes() functions for batch
+registration/unregistration of a group of *probes. These functions
+can speed up unregistration process when you have to unregister
+a lot of probes at once.
+
The next three subsections explain how the different types of
probes work. They explain certain things that you'll need to
know in order to make the best use of Kprobes -- e.g., the
@@ -190,10 +195,11 @@ code mapping.
4. API Reference
The Kprobes API includes a "register" function and an "unregister"
-function for each type of probe. Here are terse, mini-man-page
-specifications for these functions and the associated probe handlers
-that you'll write. See the files in the samples/kprobes/ sub-directory
-for examples.
+function for each type of probe. The API also includes "register_*probes"
+and "unregister_*probes" functions for (un)registering arrays of probes.
+Here are terse, mini-man-page specifications for these functions and
+the associated probe handlers that you'll write. See the files in the
+samples/kprobes/ sub-directory for examples.
4.1 register_kprobe
@@ -319,6 +325,43 @@ void unregister_kretprobe(struct kretprobe *rp);
Removes the specified probe. The unregister function can be called
at any time after the probe has been registered.
+NOTE:
+If the functions find an incorrect probe (ex. an unregistered probe),
+they clear the addr field of the probe.
+
+4.5 register_*probes
+
+#include <linux/kprobes.h>
+int register_kprobes(struct kprobe **kps, int num);
+int register_kretprobes(struct kretprobe **rps, int num);
+int register_jprobes(struct jprobe **jps, int num);
+
+Registers each of the num probes in the specified array. If any
+error occurs during registration, all probes in the array, up to
+the bad probe, are safely unregistered before the register_*probes
+function returns.
+- kps/rps/jps: an array of pointers to *probe data structures
+- num: the number of the array entries.
+
+NOTE:
+You have to allocate(or define) an array of pointers and set all
+of the array entries before using these functions.
+
+4.6 unregister_*probes
+
+#include <linux/kprobes.h>
+void unregister_kprobes(struct kprobe **kps, int num);
+void unregister_kretprobes(struct kretprobe **rps, int num);
+void unregister_jprobes(struct jprobe **jps, int num);
+
+Removes each of the num probes in the specified array at once.
+
+NOTE:
+If the functions find some incorrect probes (ex. unregistered
+probes) in the specified array, they clear the addr field of those
+incorrect probes. However, other probes in the array are
+unregistered correctly.
+
5. Kprobes Features and Limitations
Kprobes allows multiple probes at the same address. Currently,