linux-kernel - Re: [PATCH 10/13] tracing/uprobes: Fetch args before reserving a ring buffer

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Message-ID: <20131103202037.GA2785@redhat.com>
Date:	Sun, 3 Nov 2013 21:20:37 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hyeoncheol Lee <cheol.lee@....com>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 10/13] tracing/uprobes: Fetch args before reserving a
	ring buffer

On 11/01, Oleg Nesterov wrote:
>
> Ah, please ignore... handler_chain() is not self-serialized, so
> tu->buffer needs locking/waiting too.

Still I have to admit that I strongly dislike this yet another
(and imho strange) memory pool. However, I am not going to argue
because I can't suggest something better right now.

But. Perhaps it makes sense to at least add a couple of trivial
helpers in 10/13? Something like arg_buf_get/put/init, just to
simplify the potential changes.

Also. I think we should not use this pool unconditionally but
again, this is another improvement we can do later.

Oleg.

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