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    SubjectRe: [patch v2 2/3] This patch enhances OProfile to support System zs hardware sampling feature
    On 21.01.11 05:06:53, Heinz Graalfs wrote:
    > From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
    >
    > OProfile is enhanced to export all files for controlling System z's hardware sampling,
    > and to invoke hwsampler exported functions to initialize and use System z's hardware sampling.
    >
    > The patch invokes hwsampler_setup() during oprofile init and exports following
    > hwsampler files under oprofilefs if hwsampler's setup succeeded:
    >
    > A new directory for hardware sampling based files
    >
    > /dev/oprofile/hwsampling/
    >
    > The userland daemon must explicitly write to the following files
    > to disable (or enable) hardware based sampling
    >
    > /dev/oprofile/hwsampling/hwsampler
    >
    > to modify the actual sampling rate
    >
    > /dev/oprofile/hwsampling/hw_interval
    >
    > to modify the amount of sampling memory (measured in 4K pages)
    >
    > /dev/oprofile/hwsampling/hw_sdbt_blocks
    >
    > The following files are read only and show
    > the possible minimum sampling rate
    >
    > /dev/oprofile/hwsampling/hw_min_interval
    >
    > the possible maximum sampling rate
    >
    > /dev/oprofile/hwsampling/hw_max_interval
    >
    > The patch splits the oprofile_timer_[init/exit] function so that it can be also called
    > through user context (oprofilefs) to avoid kernel oops.
    >
    > Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
    > Signed-off-by: Maran Pakkirisamy <maranp@linux.vnet.ibm.com>
    > Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
    > ---
    > arch/s390/oprofile/Makefile | 3
    > arch/s390/oprofile/hwsampler_files.c | 146 +++++++++++++++++++++++++++++++++++
    > arch/s390/oprofile/init.c | 7 +
    > drivers/oprofile/oprof.c | 32 +++++++
    > drivers/oprofile/oprof.h | 2
    > drivers/oprofile/timer_int.c | 16 +++
    > include/linux/oprofile.h | 21 +++++
    > 7 files changed, 222 insertions(+), 5 deletions(-)

    Applied with following changes:
    * whitespace changes in Makefile and timer_int.c

    I reworked some changes in a follow-on patch which I apply on top of
    your patch set.

    -Robert

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



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