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| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2010-12-03 18:54:28 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-12-06 17:59:31 +0100 |
| commit | cd7ebe2298ff1c3112232878678ce5fe6be8a15b (patch) | |
| tree | 7bac7adf40ce2141e779b7d99b2784279c2dc45c /kernel | |
| parent | 7deb18dcf0478940ac979de002db1ed8ba6531dc (diff) | |
| download | linux-cd7ebe2298ff1c3112232878678ce5fe6be8a15b.tar.gz linux-cd7ebe2298ff1c3112232878678ce5fe6be8a15b.tar.bz2 linux-cd7ebe2298ff1c3112232878678ce5fe6be8a15b.zip | |
kprobes: Use text_poke_smp_batch for optimizing
Use text_poke_smp_batch() in optimization path for reducing
the number of stop_machine() issues. If the number of optimizing
probes is more than MAX_OPTIMIZE_PROBES(=256), kprobes optimizes
first MAX_OPTIMIZE_PROBES probes and kicks optimizer for
remaining probes.
Changes in v5:
- Use kick_kprobe_optimizer() instead of directly calling
schedule_delayed_work().
- Rescheduling optimizer outside of kprobe mutex lock.
Changes in v2:
- Allocate code buffer and parameters in arch_init_kprobes()
instead of using static arraies.
- Merge previous max optimization limit patch into this patch.
So, this patch introduces upper limit of optimization at
once.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.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
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20101203095428.2961.8994.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kprobes.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 134754d18bb4..531e10164836 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -480,8 +480,6 @@ static DECLARE_COMPLETION(optimizer_comp); */ static __kprobes void do_optimize_kprobes(void) { - struct optimized_kprobe *op, *tmp; - /* Optimization never be done when disarmed */ if (kprobes_all_disarmed || !kprobes_allow_optimization || list_empty(&optimizing_list)) @@ -499,12 +497,7 @@ static __kprobes void do_optimize_kprobes(void) */ get_online_cpus(); mutex_lock(&text_mutex); - list_for_each_entry_safe(op, tmp, &optimizing_list, list) { - WARN_ON(kprobe_disabled(&op->kp)); - if (arch_optimize_kprobe(op) < 0) - op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED; - list_del_init(&op->list); - } + arch_optimize_kprobes(&optimizing_list); mutex_unlock(&text_mutex); put_online_cpus(); } @@ -598,8 +591,12 @@ static __kprobes void kprobe_optimizer(struct work_struct *work) mutex_unlock(&kprobe_mutex); mutex_unlock(&module_mutex); - /* Wake up all waiters */ - complete_all(&optimizer_comp); + /* Step 5: Kick optimizer again if needed */ + if (!list_empty(&optimizing_list)) + kick_kprobe_optimizer(); + else + /* Wake up all waiters */ + complete_all(&optimizer_comp); } /* Wait for completing optimization and unoptimization */ |