From: "Frank Ch. Eigler" <fche@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
linux-arch@vger.kernel.org,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Sandeepa Prabhu <sandeepa.prabhu@linaro.org>,
x86@kernel.org, lkml <linux-kernel@vger.kernel.org>,
"Steven Rostedt (Red Hat)" <rostedt@goodmis.org>,
systemtap@sourceware.org,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH -tip v6 00/22] kprobes: introduce NOKPROBE_SYMBOL(), cleanup and fixes crash bugs
Date: Sun, 09 Feb 2014 21:27:00 -0000 [thread overview]
Message-ID: <20140209212724.GA6892@redhat.com> (raw)
In-Reply-To: <20140209143709.GA31608@gmail.com>
Hi -
> > So the similar thing happens when we enables events as below;
> >
> > # for i in /sys/kernel/debug/tracing/events/kprobes/* ; do date; echo 1 > $i; done
> > Wed Jan 29 10:44:50 UTC 2014
> > ...
> >
> > I tried it and canceled after 4 min passed. It enabled about 17k
> > events and slowed down my system very much(I almost got hang check
> > timer).
>
> Ok, I guess that's the slowdown bug that Frank reported.
It could be, but it feels a bit different. In my testing from
December, it's as though it wasn't the activated probes *hitting* that
were associated with the slowdown, but them merely being activated.
It was as though something with the kprobes/ftrace probe-registration
code performed a lot more work than it did longer ago. (One way to
test this could be to be more careful in the selection of kprobes
being enabled. For examle, emplace thousands, but only unused loaded
modules.) I'm sorry I didn't get time to investigate further.
- FChE
next prev parent reply other threads:[~2014-02-09 21:27 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 9:09 Masami Hiramatsu
2013-12-19 9:09 ` [PATCH -tip v6 03/22] [BUGFIX] kprobes/x86: Prohibit probing on debug_stack_* Masami Hiramatsu
2013-12-19 9:09 ` [PATCH -tip v6 05/22] [BUGFIX] x86: Prohibit probing on thunk functions and restore Masami Hiramatsu
2013-12-19 9:09 ` [PATCH -tip v6 01/22] kprobes: Prohibit probing on .entry.text code Masami Hiramatsu
2013-12-19 9:09 ` [PATCH -tip v6 06/22] [BUGFIX] x86: Prohibit probing on memcpy/memset Masami Hiramatsu
2013-12-19 9:37 ` Jovi Zhangwei
2013-12-20 2:38 ` Masami Hiramatsu
2013-12-20 3:07 ` Jovi Zhangwei
2013-12-20 4:42 ` Masami Hiramatsu
2013-12-20 8:31 ` Jovi Zhangwei
2013-12-20 9:21 ` Masami Hiramatsu
2013-12-23 4:51 ` Jovi Zhangwei
2013-12-23 10:59 ` Masami Hiramatsu
2013-12-24 6:39 ` Jovi Zhangwei
2013-12-24 8:32 ` Masami Hiramatsu
2013-12-24 9:53 ` Jovi Zhangwei
2013-12-24 15:58 ` Masami Hiramatsu
2013-12-25 14:44 ` Jovi Zhangwei
2013-12-19 9:09 ` [PATCH -tip v6 02/22] kprobes: Introduce NOKPROBE_SYMBOL() macro for blacklist Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 04/22] [BUGFIX] x86: Prohibit probing on native_set_debugreg/load_idt Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 12/22] x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 11/22] x86: Allow kprobes on text_poke/hw_breakpoint Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 13/22] kprobes: Use NOKPROBE_SYMBOL macro instead of __kprobes Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 17/22] kprobes: Show blacklist entries via debugfs Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 18/22] kprobes: Support blacklist functions in module Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 07/22] kprobes/x86: Call exception handlers directly from do_int3/do_debug Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 14/22] ftrace/kprobes: Use NOKPROBE_SYMBOL macro in ftrace Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 21/22] kprobes/x86: Remove unneeded preempt_disable/enable in interrupt handlers Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 19/22] kprobes: Use NOKPROBE_SYMBOL() in sample modules Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 22/22] [RFC] kprobes/x86: Add emergency recovery process for bad kprobes Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 15/22] notifier: Use NOKPROBE_SYMBOL macro in notifier Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 20/22] kprobes/x86: Use kprobe_blacklist for .kprobes.text and .entry.text Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 09/22] kprobes: Allow probe on some kprobe functions Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 16/22] sched: Use NOKPROBE_SYMBOL macro in sched Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 08/22] kprobes/x86: Allow probe on some kprobe preparation functions Masami Hiramatsu
2013-12-19 9:10 ` [PATCH -tip v6 10/22] ftrace/kprobes: Allow probing on some " Masami Hiramatsu
2013-12-19 20:46 ` [PATCH -tip v6 00/22] kprobes: introduce NOKPROBE_SYMBOL(), cleanup and fixes crash bugs Frank Ch. Eigler
2013-12-20 4:22 ` Masami Hiramatsu
2013-12-20 8:21 ` Ingo Molnar
2013-12-20 9:31 ` Masami Hiramatsu
2013-12-20 10:46 ` Ingo Molnar
2013-12-22 21:10 ` Masami Hiramatsu
2013-12-23 13:04 ` Ingo Molnar
2013-12-24 1:19 ` Masami Hiramatsu
2014-01-29 11:22 ` Masami Hiramatsu
2014-02-09 14:37 ` Ingo Molnar
2014-02-09 21:27 ` Frank Ch. Eigler [this message]
2014-02-10 4:02 ` Masami Hiramatsu
2014-02-10 11:32 ` Masami Hiramatsu
2013-12-20 13:41 ` Frank Ch. Eigler
2013-12-22 21:32 ` Masami Hiramatsu
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