linux-kernel - [RFC] [PATCH 0/2] x86: make jump labels use int3-based breakpoint instead of stop

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Message-ID: <alpine.LNX.2.00.1307102213140.25858@pobox.suse.cz>
Date:	Wed, 10 Jul 2013 22:25:46 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...hat.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC] [PATCH 0/2] x86: make jump labels use int3-based breakpoint
 instead of stop_machine()

Hi,

this is a resurrection of a few years old idea to have jump labels use 
synchronization based on int3 breakpoint rather than relying on 
stop_machine() with all the consequences.

ftrace has been doing exactly this kind of patching for year since 
08d636b6 ("ftrace/x86: Have arch x86_64 use breakpoints instead of stop 
machine").

This patchset first introduces generic text_poke_bp() that provides means 
to perform this method of patching in parallel to text_poke_smp(), and 
then converts x86 jump label code to use it.

If this is merged, I'll do a followup patch converting ftrace to use this 
infrastructure as well, as it's doing the same thing in principle already.

Comments welcome.

-- 
Jiri Kosina
SUSE Labs
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