linux-kernel - Re: [RFC][PATCH 0/3] ftrace: Add dynamically allocated trampolines

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Message-ID: <alpine.LNX.2.00.1407102342050.8779@pobox.suse.cz>
Date:	Thu, 10 Jul 2014 23:44:43 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [RFC][PATCH 0/3] ftrace: Add dynamically allocated trampolines

On Thu, 10 Jul 2014, Josh Poimboeuf wrote:

> I did some testing with kpatch and I found one minor issue.  The dynamically
> allocated trampoline seems to confuse dump_stack() somewhat.
> 
> I added a dump_stack() call in my ftrace_ops callback function
> (kpatch_ftrace_handler) which had a filter on meminfo_proc_show().

Interesting. Are you using dwarf2 unwinder for stack dumping by any 
chance? It seems to get things right here. Will look into it more 
tomorrow.

-- 
Jiri Kosina
SUSE Labs
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