linux-kernel - Re: [RFC][PATCH 0/5] tracing: Add new file system tracefs

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Message-ID: <20150122152431.GC4507@htj.dyndns.org>
Date:	Thu, 22 Jan 2015 10:24:31 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 0/5] tracing: Add new file system tracefs

On Thu, Jan 22, 2015 at 10:15:30AM -0500, Steven Rostedt wrote:
> > kernfs provides two sets of file operations.  One is seq_file based
> > and the other is direct read/write.  In both cases, bouncing data
> > between userland and kernel is handled by kernfs.  If you already have
> > existing read write ops implemented doing custom buffer handling and
> > direct userland memory access, it'll take some adaptation but for a
> > lot of cases this would consolidate duplicate code paths.
> 
> Does it also handle splice? That's a key part of the tracing code.

It doesn't yet.  We can add it as a part of kernfs_syscall_ops tho
which exists to support these specialized bypass operations.  kernfs
doesn't do much with these.  It just passes over the calls to the
registered callbacks.

Thanks.

-- 
tejun
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