From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>,
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: Fri, 20 Dec 2013 13:21:58 +0900 [thread overview]
Message-ID: <52B3C5E6.2040802@hitachi.com> (raw)
In-Reply-To: <y0m38loefhx.fsf@fche.csb>
(2013/12/20 5:46), Frank Ch. Eigler wrote:
>
> Hi, Masami -
>
>
> masami.hiramatsu.pt wrote:
>
>> Here is the version 6 of NOKPROBE_SYMBOL series. :)
>> [...]
>
> Some preliminary results from building these on top of tip/master on
> x86-64.
>
> # stap -te "probe kprobe.function("*") {}"
>
> starts up OK, without crashes, which looks like great progress.
That's a good news :)
> But a
> closer look indicates that the insertion of kprobes is taking about
> three (!!) orders of magnitude longer than before, as judged by the
> rate of increase of 'wc -l /sys/kernel/debug/kprobes/list'.
Right, because kprobes are not designed for thousands of probes.
> So, one
> has to let the thing run for several hours just to get all the kprobes
> inserted, never mind letting stress-testing begin.
>
> For reference, here's the steady-state "perf top" output during all this
> insertion work:
>
> 54.81% [kernel] [k] _raw_spin_unlock_irqrestore
> 38.13% [kernel] [k] __slab_alloc
> 1.11% [kernel] [k] kprobe_ftrace_handler
> 0.88% [kernel] [k] _raw_spin_unlock_irq
Hmm, interesting. Those probes are registered as disabled?
Thank you,
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
next prev parent reply other threads:[~2013-12-20 4:21 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 9:03 [PATCH -tip v6 00/22] kprobes: introduce NOKPROBE_SYMBOL(), cleanup and fixes crash bugs Masami Hiramatsu
2013-12-19 9:03 ` [PATCH -tip v6 01/22] kprobes: Prohibit probing on .entry.text code Masami Hiramatsu
2013-12-19 9:03 ` [PATCH -tip v6 02/22] kprobes: Introduce NOKPROBE_SYMBOL() macro for blacklist Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 03/22] [BUGFIX] kprobes/x86: Prohibit probing on debug_stack_* Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 04/22] [BUGFIX] x86: Prohibit probing on native_set_debugreg/load_idt Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 05/22] [BUGFIX] x86: Prohibit probing on thunk functions and restore Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 06/22] [BUGFIX] x86: Prohibit probing on memcpy/memset Masami Hiramatsu
2013-12-19 9:37 ` Jovi Zhangwei
2013-12-20 2:37 ` 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 9:04 ` [PATCH -tip v6 07/22] kprobes/x86: Call exception handlers directly from do_int3/do_debug Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 08/22] kprobes/x86: Allow probe on some kprobe preparation functions Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 09/22] kprobes: Allow probe on some kprobe functions Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 10/22] ftrace/kprobes: Allow probing on some preparation functions Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 11/22] x86: Allow kprobes on text_poke/hw_breakpoint Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 12/22] x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 13/22] kprobes: Use NOKPROBE_SYMBOL macro instead of __kprobes Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 14/22] ftrace/kprobes: Use NOKPROBE_SYMBOL macro in ftrace Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 15/22] notifier: Use NOKPROBE_SYMBOL macro in notifier Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 16/22] sched: Use NOKPROBE_SYMBOL macro in sched Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 17/22] kprobes: Show blacklist entries via debugfs Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 18/22] kprobes: Support blacklist functions in module Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 19/22] kprobes: Use NOKPROBE_SYMBOL() in sample modules Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 20/22] kprobes/x86: Use kprobe_blacklist for .kprobes.text and .entry.text Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 21/22] kprobes/x86: Remove unneeded preempt_disable/enable in interrupt handlers Masami Hiramatsu
2013-12-19 9:04 ` [PATCH -tip v6 22/22] [RFC] kprobes/x86: Add emergency recovery process for bad kprobes 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 4:21 ` Masami Hiramatsu [this message]
2013-12-20 8:20 ` 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
2014-02-10 4:02 ` Masami Hiramatsu
2014-02-10 11:31 ` Masami Hiramatsu
2013-12-20 13:40 ` Frank Ch. Eigler
2013-12-22 21:32 ` Masami Hiramatsu
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