linux-kernel - Re: [PATCH v5 3.1.0-rc4-tip 0/26] Uprobes patchset with perf probe support

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Message-ID: <20110920142843.GA9995@infradead.org>
Date:	Tue, 20 Sep 2011 10:28:43 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3.1.0-rc4-tip 0/26]   Uprobes patchset with perf probe
 support

On Tue, Sep 20, 2011 at 07:42:04PM +0530, Srikar Dronamraju wrote:
> I could use any other inode/file/mapping based sleepable lock that is of
> higher order than mmap_sem. Can you please let me know if we have
> alternatives.

Please do not overload unrelated locks for this, but add a specific one.

There's two options:

 (a) add it to the inode (conditionally)
 (b) use global, hashed locks

I think (b) is good enough as adding/removing probes isn't exactly the
most critical fast path.

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