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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>
This commit is contained in:
Masami Hiramatsu 2010-12-03 18:54:03 +09:00 committed by Ingo Molnar
parent 6f0f1dd719
commit 61f4e13ffd
1 changed files with 26 additions and 17 deletions
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43
kernel/kprobes.c
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@ -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);