Commit-ID: 61f4e13ffd85c037a942c5b7fd13f2b0c3162862
Gitweb: http://git.kernel.org/tip/61f4e13ffd85c037a942c5b7fd13f2b0c3162862
Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Fri, 3 Dec 2010 18:54:03 +0900
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 6 Dec 2010 17:59:30 +0100
kprobes: Separate kprobe optimizing code from optimizer
Separate kprobe optimizing code from optimizer, this
will make easy to introducing unoptimizing code in
optimizer.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: 2nddept-manager@sdl.hitachi.co.jp
LKML-Reference: <20101203095403.2961.91201.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/kprobes.c | 43 ++++++++++++++++++++++++++-----------------
1 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index ab99caf..1f4f9b9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -427,26 +427,14 @@ static void kprobe_optimizer(struct work_struct *work);
static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer);
#define OPTIMIZE_DELAY 5
-/* Kprobe jump optimizer */
-static __kprobes void kprobe_optimizer(struct work_struct *work)
+/*
+ * Optimize (replace a breakpoint with a jump) kprobes listed on
+ * optimizing_list.
+ */
+static __kprobes void do_optimize_kprobes(void)
{
struct optimized_kprobe *op, *tmp;
- /* Lock modules while optimizing kprobes */
- mutex_lock(&module_mutex);
- mutex_lock(&kprobe_mutex);
- if (kprobes_all_disarmed || !kprobes_allow_optimization)
- goto end;
-
- /*
- * Wait for quiesence period to ensure all running interrupts
- * are done. Because optprobe may modify multiple instructions
- * there is a chance that Nth instruction is interrupted. In that
- * case, running interrupt can return to 2nd-Nth byte of jump
- * instruction. This wait is for avoiding it.
- */
- synchronize_sched();
-
/*
* The optimization/unoptimization refers online_cpus via
* stop_machine() and cpu-hotplug modifies online_cpus.
@@ -467,6 +455,27 @@ static __kprobes void kprobe_optimizer(struct work_struct *work)
}
mutex_unlock(&text_mutex);
put_online_cpus();
+}
+
+/* Kprobe jump optimizer */
+static __kprobes void kprobe_optimizer(struct work_struct *work)
+{
+ /* Lock modules while optimizing kprobes */
+ mutex_lock(&module_mutex);
+ mutex_lock(&kprobe_mutex);
+ if (kprobes_all_disarmed || !kprobes_allow_optimization)
+ goto end;
+
+ /*
+ * Wait for quiesence period to ensure all running interrupts
+ * are done. Because optprobe may modify multiple instructions
+ * there is a chance that Nth instruction is interrupted. In that
+ * case, running interrupt can return to 2nd-Nth byte of jump
+ * instruction. This wait is for avoiding it.
+ */
+ synchronize_sched();
+
+ do_optimize_kprobes();
end:
mutex_unlock(&kprobe_mutex);
mutex_unlock(&module_mutex);
--
