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oprofile, s390: Rework hwsampler implementation

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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>
This commit is contained in:
Robert Richter
2011-02-11 17:31:44 +01:00
parent 997dbb4967
commit a0d76247e0
6 changed files with 41 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
include/linux/oprofile.h
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@@ -91,27 +91,6 @@ int oprofile_arch_init(struct oprofile_operations * ops);
*/
void oprofile_arch_exit(void);
#ifdef CONFIG_HAVE_HWSAMPLER
/**
* setup hardware sampler for oprofiling.
*/
int oprofile_set_hwsampler(unsigned long);
/**
* hardware sampler module initialization for the s390 arch
*/
int oprofile_arch_set_hwsampler(struct oprofile_operations *ops);
/**
* Add an s390 hardware sample.
*/
void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
unsigned long event, int is_kernel,
struct task_struct *task);
#endif /* CONFIG_HAVE_HWSAMPLER */
/**
* Add a sample. This may be called from any context.
*/