From: Masami Hiramatsu <mhiramat@redhat.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Arjan van de Ven <arjan@infradead.org>,
"H. Peter Anvin" <hpa@zytor.com>,
rostedt@goodmis.org, Jason Baron <jbaron@redhat.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de,
andi@firstfloor.org, roland@redhat.com, rth@redhat.com
Subject: Re: [RFC PATCH 2/8] jump label v4 - x86: Introduce generic jump patching without stop_machine
Date: Mon, 18 Jan 2010 13:21:02 -0500 [thread overview]
Message-ID: <4B54A68E.4050409@redhat.com> (raw)
In-Reply-To: <20100118165443.GB29764@Krystal>
Mathieu Desnoyers wrote:
> * Arjan van de Ven (arjan@infradead.org) wrote:
>> On Mon, 18 Jan 2010 10:59:30 -0500
>> Masami Hiramatsu <mhiramat@redhat.com> wrote:
>>
>>> Yeah, so in the latest patch, I updated it to use int3 even if
>>> len == 1. :-)
>>>
>>
>>
>> int3 is not making a difference for your case; there is no guarantee
>> that the other processor even sees the "int3 inbetween state" at all;
>> if it's not safe without int3 then it won't be safe with int3 either.
>
> What Masami means is that he updated his patch to use the int3+IPI
> broadcast scheme.
Right.
>
> Therefore, the CPUs not seeing the int3 inbetween state will be forced
> to issue a serializing instruction while the int3 is in place anyway.
By the way, in kprobes, we just use a text_poke() to put int3.
I assume that we'd better send IPI afterward, wouldn't it?
Thank you,
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2010-01-18 18:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 16:26 [RFC PATCH 0/8] jump label v4 Jason Baron
2010-01-12 16:26 ` [RFC PATCH 1/8] jump label v4 - kprobes/x86: Cleanup RELATIVEJUMP_INSTRUCTION to RELATIVEJUMP_OPCODE Jason Baron
2010-01-12 16:26 ` [RFC PATCH 2/8] jump label v4 - x86: Introduce generic jump patching without stop_machine Jason Baron
2010-01-12 23:16 ` H. Peter Anvin
2010-01-13 2:06 ` Mathieu Desnoyers
2010-01-13 4:55 ` H. Peter Anvin
2010-01-13 14:30 ` Mathieu Desnoyers
2010-01-14 6:57 ` Masami Hiramatsu
2010-01-14 18:45 ` Masami Hiramatsu
2010-04-13 17:16 ` Mathieu Desnoyers
2010-01-13 5:38 ` Masami Hiramatsu
2010-01-14 15:32 ` Steven Rostedt
2010-01-14 15:36 ` H. Peter Anvin
2010-01-17 18:55 ` Mathieu Desnoyers
2010-01-17 19:16 ` Arjan van de Ven
2010-01-18 15:59 ` Masami Hiramatsu
2010-01-18 16:23 ` H. Peter Anvin
2010-01-18 16:52 ` Mathieu Desnoyers
2010-01-18 18:50 ` H. Peter Anvin
2010-01-18 20:53 ` Masami Hiramatsu
2010-01-18 21:18 ` H. Peter Anvin
2010-01-18 21:32 ` Mathieu Desnoyers
2010-01-18 16:31 ` Arjan van de Ven
2010-01-18 16:54 ` Mathieu Desnoyers
2010-01-18 18:21 ` Masami Hiramatsu [this message]
2010-01-18 18:33 ` Mathieu Desnoyers
2010-01-14 15:39 ` Mathieu Desnoyers
2010-01-14 16:23 ` Masami Hiramatsu
2010-01-14 16:42 ` Jason Baron
2010-01-12 16:26 ` [RFC PATCH 3/8] jump label v4 - move opcode definitions Jason Baron
2010-01-12 16:26 ` [RFC PATCH 4/8] jump label v4 - notifier atomic call chain notrace Jason Baron
2010-01-12 16:26 ` [RFC PATCH 5/8] jump label v4 - base patch Jason Baron
2010-01-12 16:26 ` [RFC PATCH 6/8] jump label v4 - x86 support Jason Baron
2010-01-12 16:26 ` [RFC PATCH 7/8] jump label v4 - tracepoint support Jason Baron
2010-01-12 16:26 ` [RFC PATCH 8/8] jump label v4 - add module support Jason Baron
-- strict thread matches above, loose matches on Subject: below --
2010-01-17 22:56 [RFC PATCH 2/8] jump label v4 - x86: Introduce generic jump patching without stop_machine H. Peter Anvin
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