linux-kernel - Re: [PATCH] oprofile: disable write access to oprofilefs while profiler is running

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Message-ID: <20101012153324.GZ13563@erda.amd.com>
Date:	Tue, 12 Oct 2010 17:33:24 +0200
From:	Robert Richter <robert.richter@....com>
To:	Maynard Johnson <maynardj@...ibm.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	William Cohen <wcohen@...hat.com>,
	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH] oprofile: disable write access to oprofilefs while
 profiler is running

On 05.10.10 06:36:57, Robert Richter wrote:
> Oprofile counters are setup when profiling is disabled. Thus, writing
> to oprofilefs has no immediate effect. Changes are updated only after
> oprofile is reenabled.
> 
> To keep userland and kernel states synchronized, we now allow
> configuration of oprofile only if profiling is disabled.  In this case
> it checks if the profiler is running and then disables write access to
> oprofilefs by returning -EBUSY. The change should be backward
> compatible with current oprofile userland daemon.
> 
> Cc: Maynard Johnson <maynardj@...ibm.com>
> Cc: William Cohen <wcohen@...hat.com>
> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Signed-off-by: Robert Richter <robert.richter@....com>
> ---
>  drivers/oprofile/oprof.c          |   19 +++++--------------
>  drivers/oprofile/oprof.h          |    2 +-
>  drivers/oprofile/oprofile_files.c |    7 +++++--
>  drivers/oprofile/oprofilefs.c     |    8 ++++++--
>  4 files changed, 17 insertions(+), 19 deletions(-)

I applied the patch to oprofile/core. Maynard, thanks for review.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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