diff options
author | Robert Richter <robert.richter@amd.com> | 2011-02-11 17:31:44 +0100 |
---|---|---|
committer | Robert Richter <robert.richter@amd.com> | 2011-02-15 11:10:20 +0100 |
commit | a0d76247e07abd14968adc4486aaa8e270e9c209 (patch) | |
tree | bec9fa0f5a3c7b3d1f3c3032900d74f41941ed2d /drivers/oprofile/oprof.c | |
parent | 997dbb4967da248808850c250182ef2528fff2d1 (diff) |
oprofile, s390: Rework hwsampler implementation
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 <heiko.carstens@de.ibm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'drivers/oprofile/oprof.c')
-rw-r--r-- | drivers/oprofile/oprof.c | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c index 43b01daa91e1..f9bda64fcd1b 100644 --- a/drivers/oprofile/oprof.c +++ b/drivers/oprofile/oprof.c @@ -239,38 +239,6 @@ int oprofile_set_ulong(unsigned long *addr, unsigned long val) return err; } -#ifdef CONFIG_HAVE_HWSAMPLER -int oprofile_set_hwsampler(unsigned long val) -{ - int err = 0; - - mutex_lock(&start_mutex); - - if (oprofile_started) { - err = -EBUSY; - goto out; - } - - switch (val) { - case 1: - /* Switch to hardware sampling. */ - __oprofile_timer_exit(); - err = oprofile_arch_set_hwsampler(&oprofile_ops); - break; - case 0: - printk(KERN_INFO "oprofile: using timer interrupt.\n"); - err = __oprofile_timer_init(&oprofile_ops); - break; - default: - err = -EINVAL; - } - -out: - mutex_unlock(&start_mutex); - return err; -} -#endif /* CONFIG_HAVE_HWSAMPLER */ - static int __init oprofile_init(void) { int err; |