Eric Lee / linux-smarc-t335x-v3.2

15 Feb, 2011

2 commits

  • a0d76247e   oprofile, s390: Rework hwsampler implementation ... Browse Code »

    This patch is a rework of the hwsampler oprofile implementation that
    has been applied recently. Now there are less non-architectural
    changes. The only changes are:

    * introduction of oprofile_add_ext_hw_sample(), and
    * removal of section attributes of oprofile_timer_init/_exit().

    To setup hwsampler for oprofile we need to modify start()/stop()
    callbacks and additional hwsampler control files in oprofilefs. We do
    not reinitialize the timer or hwsampler mode by restarting calling
    init/exit() anymore, instead hwsampler_running is used to switch the
    mode directly in oprofile_hwsampler_start/_stop(). For locking reasons
    there is also hwsampler_file that reflects the value in oprofilefs.

    The overall diffstat of the oprofile s390 hwsampler implemenation
    shows the low impact to non-architectural code:

    arch/Kconfig | 3 +
    arch/s390/Kconfig | 1 +
    arch/s390/oprofile/Makefile | 2 +-
    arch/s390/oprofile/hwsampler.c | 1256 ++++++++++++++++++++++++++++++++++
    arch/s390/oprofile/hwsampler.h | 113 +++
    arch/s390/oprofile/hwsampler_files.c | 162 +++++
    arch/s390/oprofile/init.c | 6 +-
    drivers/oprofile/cpu_buffer.c | 24 +-
    drivers/oprofile/timer_int.c | 4 +-
    include/linux/oprofile.h | 7 +
    10 files changed, 1567 insertions(+), 11 deletions(-)

    Acked-by: Heiko Carstens
    Signed-off-by: Robert Richter

    Robert Richter
     
  • 997dbb496   oprofile, s390: Enhance OProfile to support System zs hardware sampling feature ... Browse Code »

    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.

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

    Signed-off-by: Mahesh Salgaonkar
    Signed-off-by: Maran Pakkirisamy
    Signed-off-by: Heinz Graalfs
    Acked-by: Heiko Carstens
    Signed-off-by: Robert Richter

    Heinz Graalfs
     

29 Oct, 2010

1 commit

  • 4ac3dbec8   oprofile: Fix the hang while taking the cpu offline ... Browse Code »

    The kernel build with CONFIG_OPROFILE and CPU_HOTPLUG enabled.
    The oprofile is initialised using system timer in absence of hardware
    counters supports. Oprofile isn't started from userland.

    In this setup while doing a CPU offline the kernel hangs in infinite
    for loop inside lock_hrtimer_base() function

    This happens because as part of oprofile_cpu_notify(, it tries to
    stop an hrtimer which was never started. These per-cpu hrtimers
    are started when the oprfile is started.
    echo 1 > /dev/oprofile/enable

    This problem also existwhen the cpu is booted with maxcpus parameter
    set. When bringing the remaining cpus online the timers are started
    even if oprofile is not yet enabled.

    This patch fix this issue by adding a state variable so that
    these hrtimer start/stop is only attempted when oprofile is
    started

    For stable kernels v2.6.35.y and v2.6.36.y.

    Reported-by: Jan Sebastien
    Tested-by: sricharan
    Signed-off-by: Santosh Shilimkar
    Cc: stable@kernel.org
    Signed-off-by: Robert Richter

    Santosh Shilimkar
     

03 Mar, 2010

1 commit

  • bc078e4ea   oprofile: convert oprofile from timer_hook to hrtimer ... Browse Code »

    Oprofile is currently broken on systems running with NOHZ enabled.
    A maximum of 1 tick is accounted via the timer_hook if a cpu sleeps
    for a longer period of time. This does bad things to the percentages
    in the profiler output. To solve this problem convert oprofile to
    use a restarting hrtimer instead of the timer_hook.

    Signed-off-by: Martin Schwidefsky
    Signed-off-by: Robert Richter

    Martin Schwidefsky
     

16 Oct, 2008

2 commits

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds