Oleg Nesterov wrote:
On 07/26, Pavel Emelyanov wrote:
+#define find_pid(pid) find_pid_ns(pid, &init_pid_ns)
Again, I think find_pid() should use current's active ns, not
init_pid_ns. Just grep for find_pid/find_task_by_pid.
--- linux-2.6.23-rc1-mm1.orig/kernel/pid.c 2007-07-26 16:34:45.000000000
+0400
+++ linux-2.6.23-rc1-mm1-7/kernel/pid.c 2007-07-26 16:36:37.000000000 +0400
@@ -204,19 +221,20 @@ static void delayed_put_pid(struct rcu_h
goto out;
}
-struct pid * fastcall find_pid(int nr)
+struct pid * fastcall find_pid_ns(int nr, struct pid_namespace *ns)
{
struct hlist_node *elem;
- struct pid *pid;
+ struct upid *pnr;
+
+ hlist_for_each_entry_rcu(pnr, elem,
+ &pid_hash[pid_hashfn(nr, ns)], pid_chain)
+ if (pnr->nr == nr && pnr->ns == ns)
^^^^^^^^^^^^^
Aha, that is why we need upid->ns.
That's it :)
I am a bit surprised we don't move the global pid_hash into the
"struct pid_namespace", this could speedup the search, and we
don't need upid->ns.
Hm... Worth thinking about, but this hash itself is large enough and
its size depends on the node's number of pages, so we'll have
1. either to make per-namespace hash (much) smaller;
2. or to give (too) many memory for it.
-struct pid *find_ge_pid(int nr)
+struct pid *find_ge_pid(int nr, struct pid_namespace *ns)
{
struct pid *pid;
do {
- pid = find_pid(nr);
+ pid = find_pid_ns(nr, ns);
if (pid)
break;
- nr = next_pidmap(task_active_pid_ns(current), nr);
+ nr = next_pidmap(ns, nr);
} while (nr > 0);
return pid;
This means we should fix the caller, next_tgid(), but this is done
in 15/15.
Sorry :)
Oleg.
Thank,
Pavel
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