Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH -tip v5 3/8] [CLEANUP]kprobes: Separate kprobe optimizing code from optimizer | Date | Fri, 03 Dec 2010 18:54:03 +0900 |
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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: Ingo Molnar <mingo@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: linux-kernel@vger.kernel.org ---
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);
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