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Pull optimize-ptrace-threads into release branch

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This commit is contained in:
Tony Luck 2005-10-28 15:27:48 -07:00
commit 9590204d31
1 changed files with 10 additions and 16 deletions
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26
arch/ia64/kernel/ptrace.c
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@ -589,6 +589,7 @@ find_thread_for_addr (struct task_struct *child, unsigned long addr)
{
struct task_struct *g, *p;
struct mm_struct *mm;
struct list_head *this, *next;
int mm_users;
if (!(mm = get_task_mm(child)))
@ -600,28 +601,21 @@ find_thread_for_addr (struct task_struct *child, unsigned long addr)
goto out; /* not multi-threaded */
/*
* First, traverse the child's thread-list. Good for scalability with
* NPTL-threads.
* Traverse the current process' children list. Every task that
* one attaches to becomes a child. And it is only attached children
* of the debugger that are of interest (ptrace_check_attach checks
* for this).
*/
p = child;
do {
if (thread_matches(p, addr)) {
child = p;
goto out;
}
if (mm_users-- <= 1)
goto out;
} while ((p = next_thread(p)) != child);
do_each_thread(g, p) {
if (child->mm != mm)
list_for_each_safe(this, next, &current->children) {
p = list_entry(this, struct task_struct, sibling);
if (p->mm != mm)
continue;
if (thread_matches(p, addr)) {
child = p;
goto out;
}
} while_each_thread(g, p);
}
out:
mmput(mm);
return child;