1
linux/arch
Jason Yeh 4d4036e0e7 oprofile: Implement performance counter multiplexing
The number of hardware counters is limited. The multiplexing feature
enables OProfile to gather more events than counters are provided by
the hardware. This is realized by switching between events at an user
specified time interval.

A new file (/dev/oprofile/time_slice) is added for the user to specify
the timer interval in ms. If the number of events to profile is higher
than the number of hardware counters available, the patch will
schedule a work queue that switches the event counter and re-writes
the different sets of values into it. The switching mechanism needs to
be implemented for each architecture to support multiplexing. This
patch only implements AMD CPU support, but multiplexing can be easily
extended for other models and architectures.

There are follow-on patches that rework parts of this patch.

Signed-off-by: Jason Yeh <jason.yeh@amd.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
2009-07-20 16:33:53 +02:00
..
alpha headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
arm sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
avr32 sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
blackfin headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
cris headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
frv sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
h8300 sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
ia64 headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
m32r headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
m68k sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
m68knommu Remove multiple KERN_ prefixes from printk formats 2009-07-08 10:30:03 -07:00
microblaze headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
mips headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
mn10300 mn10300: remove duplicated #include 2009-07-13 09:09:08 -07:00
parisc sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
powerpc headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
s390 headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
sh headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-07-13 10:24:08 -07:00
um sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
x86 oprofile: Implement performance counter multiplexing 2009-07-20 16:33:53 +02:00
xtensa sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
.gitignore
Kconfig oprofile: Implement performance counter multiplexing 2009-07-20 16:33:53 +02:00