From: "H. Peter Anvin" <hpa@zytor.com>
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu,
mathieu.desnoyers@polymtl.ca, tglx@linutronix.de,
rostedt@goodmis.org, andi@firstfloor.org, roland@redhat.com,
rth@redhat.com
Subject: Re: [RFC PATCH 2/6] jump label v3 - x86: Introduce generic jump patching without stop_machine
Date: Fri, 20 Nov 2009 16:19:48 -0800 [thread overview]
Message-ID: <4B073224.5050908@zytor.com> (raw)
In-Reply-To: <4B072EF5.2090402@redhat.com>
On 11/20/2009 04:06 PM, Masami Hiramatsu wrote:
>
> If we don't care about NMI, we can use stop_machine() (for
> this reason, kprobe-jump-optimization can use stop_machine(),
> because kprobes can't probe NMI code), but tracepoint has
> to support NMI.
>
Ingo pointed out that the NMI issue can be dealt with by having the NMI
handler check a flag if code modification is in progress on the entry to
the NMI handler. So yes, NMI can trap out of the IPI hold, but it will
not go any further.
-hpa
next prev parent reply other threads:[~2009-11-21 0:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-18 22:43 [RFC PATCH 0/6] jump label v3 Jason Baron
2009-11-18 22:43 ` [RFC PATCH 1/6] jump label v3 - kprobes/x86: Cleanup RELATIVEJUMP_INSTRUCTION to RELATIVEJUMP_OPCODE Jason Baron
2009-11-18 22:43 ` [RFC PATCH 2/6] jump label v3 - x86: Introduce generic jump patching without stop_machine Jason Baron
2009-11-19 0:28 ` Mathieu Desnoyers
2009-11-19 0:58 ` Paul E. McKenney
2009-11-19 1:22 ` Steven Rostedt
2009-11-19 1:39 ` Paul E. McKenney
2009-11-19 1:57 ` Mathieu Desnoyers
2009-11-19 4:16 ` Paul E. McKenney
2009-11-19 14:04 ` Masami Hiramatsu
2009-11-19 16:03 ` Mathieu Desnoyers
2009-11-20 1:00 ` Masami Hiramatsu
2009-11-21 15:32 ` Mathieu Desnoyers
2009-11-21 1:11 ` Masami Hiramatsu
2009-11-21 15:38 ` Mathieu Desnoyers
2009-11-20 21:54 ` H. Peter Anvin
2009-11-21 0:06 ` Masami Hiramatsu
2009-11-21 0:19 ` H. Peter Anvin [this message]
2009-11-21 16:21 ` Mathieu Desnoyers
2009-11-21 21:55 ` Masami Hiramatsu
2009-11-22 1:46 ` Mathieu Desnoyers
2009-11-21 16:12 ` Mathieu Desnoyers
2009-11-18 22:43 ` [RFC PATCH 3/6] jump label v3 - move opcode defs Jason Baron
2009-11-18 22:43 ` [RFC PATCH 4/6] jump label v3 - base patch Jason Baron
2009-11-18 23:38 ` [PATCH] notifier atomic call chain notrace Mathieu Desnoyers
2009-11-19 0:02 ` Paul E. McKenney
2009-11-19 3:59 ` Masami Hiramatsu
2009-11-19 16:48 ` Jason Baron
2009-11-18 22:43 ` [RFC PATCH 5/6] jump label v3 - add module support Jason Baron
2009-11-18 22:43 ` [RFC PATCH 6/6] jump label v3 - tracepoint support Jason Baron
2009-11-18 22:51 ` [RFC PATCH 0/6] jump label v3 H. Peter Anvin
2009-11-18 23:07 ` Roland McGrath
2009-11-18 23:18 ` H. Peter Anvin
2009-11-19 3:54 ` Roland McGrath
2009-11-19 21:55 ` Jason Baron
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