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authormao, bibo <bibo.mao@intel.com>2006-06-26 00:25:22 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:22 -0700
commit36721656776f177280ccb50477a02e86e6444292 (patch)
tree20cb06eb08e98636e97703d6e0df77790ede23cf /kernel/kprobes.c
parent585deacaca3e7bfc63580623f0344d1fa9c47f11 (diff)
downloadlinux-36721656776f177280ccb50477a02e86e6444292.tar.bz2
[PATCH] Kprobe: multi kprobe posthandler for booster
If there are multi kprobes on the same probepoint, there will be one extra aggr_kprobe on the head of kprobe list. The aggr_kprobe has aggr_post_handler/aggr_break_handler whether the other kprobe post_hander/break_handler is NULL or not. This patch modifies this, only when there is one or more kprobe in the list whose post_handler is not NULL, post_handler of aggr_kprobe will be set as aggr_post_handler. [soshima@redhat.com: !CONFIG_PREEMPT fix] Signed-off-by: bibo, mao <bibo.mao@intel.com> Cc: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Yumiko Sugita <sugita@sdl.hitachi.co.jp> Cc: Hideo Aoki <haoki@redhat.com> Signed-off-by: Satoshi Oshima <soshima@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1fbf466a29aa..f095178e48c3 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -368,16 +368,15 @@ static inline void copy_kprobe(struct kprobe *old_p, struct kprobe *p)
*/
static int __kprobes add_new_kprobe(struct kprobe *old_p, struct kprobe *p)
{
- struct kprobe *kp;
-
if (p->break_handler) {
- list_for_each_entry_rcu(kp, &old_p->list, list) {
- if (kp->break_handler)
- return -EEXIST;
- }
+ if (old_p->break_handler)
+ return -EEXIST;
list_add_tail_rcu(&p->list, &old_p->list);
+ old_p->break_handler = aggr_break_handler;
} else
list_add_rcu(&p->list, &old_p->list);
+ if (p->post_handler && !old_p->post_handler)
+ old_p->post_handler = aggr_post_handler;
return 0;
}
@@ -390,9 +389,11 @@ static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
copy_kprobe(p, ap);
ap->addr = p->addr;
ap->pre_handler = aggr_pre_handler;
- ap->post_handler = aggr_post_handler;
ap->fault_handler = aggr_fault_handler;
- ap->break_handler = aggr_break_handler;
+ if (p->post_handler)
+ ap->post_handler = aggr_post_handler;
+ if (p->break_handler)
+ ap->break_handler = aggr_break_handler;
INIT_LIST_HEAD(&ap->list);
list_add_rcu(&p->list, &ap->list);
@@ -536,6 +537,21 @@ valid_p:
kfree(old_p);
}
arch_remove_kprobe(p);
+ } else {
+ mutex_lock(&kprobe_mutex);
+ if (p->break_handler)
+ old_p->break_handler = NULL;
+ if (p->post_handler){
+ list_for_each_entry_rcu(list_p, &old_p->list, list){
+ if (list_p->post_handler){
+ cleanup_p = 2;
+ break;
+ }
+ }
+ if (cleanup_p == 0)
+ old_p->post_handler = NULL;
+ }
+ mutex_unlock(&kprobe_mutex);
}
}