[Bug kprobes/2666] List active probes

["jamesd dot wi at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From jamesd dot wi at gmail dot com  2007-01-16 15:55 -------
Subject: Re:  List active probes

On 16 Jan 2007 13:09:20 -0000, srinivasa at in dot ibm dot com
<sourceware-bugzilla@sourceware.org> wrote:
>
> ------- Additional Comments From srinivasa at in dot ibm dot com  2007-01-16 13:09 -------
> (In reply to comment #2)
> > any idea how the system will respond when there are 40,000 active
> > probes or more?
> >
> > James Dickens
> > uadmin.blogspot.com
> >
> >
>  Eventhough I haven't tested the patch for 40,000 active probes,  size of
> /proc/kprobes/list file depends on available memory and maximum  size of the
> proc file.
>
i was thinking about the time spent in
+	preempt_disable();
+	hlist_for_each_entry_rcu(p, node, head, hlist) {
+		sym = kallsyms_lookup((unsigned long)p->addr, &size,
+					&offset, &modname, namebuf);
+		if (p->pre_handler == aggr_pre_handler) {
+			list_for_each_entry_rcu(kp, &p->list, list)
+				report_probe(pi, kp, sym, offset, modname);
+		} else
+			report_probe(pi, p, sym, offset, modname);
+	}
+	preempt_enable();

with preemption disabled... it could a second or more, if many probes
are enabled, it could have a negative effect on a production server.

James


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