linux-kernel - Re: [PACTH v1] trace: Add trace events for open(), exec() and uselib()

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Message-ID: <20160801181014.GB2356@ZenIV.linux.org.uk>
Date:	Mon, 1 Aug 2016 19:10:14 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	robert.foss@...labora.com
Cc:	rostedt@...dmis.org, mingo@...hat.com, scott@...ntu.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PACTH v1] trace: Add trace events for open(), exec() and
 uselib()

On Mon, Aug 01, 2016 at 01:25:40PM -0400, robert.foss@...labora.com wrote:
> From: Scott James Remnant <scott@...ntu.com>
> 
> This patch uses TRACE_EVENT to add tracepoints for the open(),
> exec() and uselib() syscalls so that ureadahead can cheaply trace
> the boot sequence to determine what to read to speed up the next.

NAK.  No Tracepoints In VFS.  Not going to happen - any tracepoint can all too
easily become a cast-in-stone userland ABI.