linux-toradex.git/include/linux/oprofile.h, branch v2.6.36-rc5

oprofile: Implement performance counter multiplexing

2009-07-20T14:33:53+00:00

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 
Signed-off-by: Robert Richter

x86/oprofile: introduce oprofile_add_data64()

2009-06-11T18:16:00+00:00

The IBS implemention writes 64 bit register values to the cpu buffer
by writing two 32 values using oprofile_add_data(). This patch
introduces oprofile_add_data64() to write a single 64 bit value to the
buffer.

Signed-off-by: Robert Richter

oprofile: remove irq_flags in struct op_entry

2009-06-11T14:10:11+00:00

This became obsolete with this commit:

 304cc6a ring_buffer: remove unused flags parameter, fix

Signed-off-by: Robert Richter

oprofile: make new cpu buffer functions part of the api

2009-01-07T21:48:15+00:00

This patch creates the new functions

 oprofile_write_reserve()
 oprofile_add_data()
 oprofile_write_commit()

and makes them part of the oprofile api.

Signed-off-by: Robert Richter

oprofile: update comment for oprofile_add_sample()

2008-12-10T13:20:03+00:00

The cpu argument is no longer part of the parameter list.

Signed-off-by: Robert Richter

powerpc/oprofile: Fix mutex locking for cell spu-oprofile

2008-10-21T04:17:48+00:00

The issue is the SPU code is not holding the kernel mutex lock while
adding samples to the kernel buffer.

This patch creates per SPU buffers to hold the data.  Data
is added to the buffers from in interrupt context.  The data
is periodically pushed to the kernel buffer via a new Oprofile
function oprofile_put_buff(). The oprofile_put_buff() function
is called via a work queue enabling the funtion to acquire the
mutex lock.

The existing user controls for adjusting the per CPU buffer
size is used to control the size of the per SPU buffers.
Similarly, overflows of the SPU buffers are reported by
incrementing the per CPU buffer stats.  This eliminates the
need to have architecture specific controls for the per SPU
buffers which is not acceptable to the OProfile user tool
maintainer.

The export of the oprofile add_event_entry() is removed as it
is no longer needed given this patch.

Note, this patch has not addressed the issue of indexing arrays
by the spu number.  This still needs to be fixed as the spu
numbering is not guarenteed to be 0 to max_num_spus-1.

Signed-off-by: Carl Love 
Signed-off-by: Maynard Johnson 
Signed-off-by: Arnd Bergmann 
Acked-by: Acked-by: Robert Richter 
Signed-off-by: Benjamin Herrenschmidt

OProfile: add IBS code macros

2008-07-26T09:48:04+00:00

Signed-off-by: Robert Richter 
Cc: oprofile-list 
Cc: Barry Kasindorf 
Signed-off-by: Ingo Molnar

[CELL] oprofile: add support to OProfile for profiling CELL BE SPUs

2007-07-20T19:42:24+00:00

From: Maynard Johnson 

This patch updates the existing arch/powerpc/oprofile/op_model_cell.c
to add in the SPU profiling capabilities.  In addition, a 'cell' subdirectory
was added to arch/powerpc/oprofile to hold Cell-specific SPU profiling code.
Exports spu_set_profile_private_kref and spu_get_profile_private_kref which
are used by OProfile to store private profile information in spufs data
structures.

Also incorporated several fixes from other patches (rrn).  Check pointer
returned from kzalloc.  Eliminated unnecessary cast.  Better error
handling and cleanup in the related area.  64-bit unsigned long parameter
was being demoted to 32-bit unsigned int and eventually promoted back to
unsigned long.

Signed-off-by: Carl Love 
Signed-off-by: Maynard Johnson 
Signed-off-by: Bob Nelson 
Signed-off-by: Arnd Bergmann 
Acked-by: Paul Mackerras

[PATCH] mark f_ops const in the inode

2006-03-28T17:16:05+00:00

Mark the f_ops members of inodes as const, as well as fix the
ripple-through this causes by places that copy this f_ops and then "do
stuff" with it.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Add oprofile_add_ext_sample

2006-03-28T17:16:02+00:00

On ppc64 we look at a profiling register to work out the sample address and
if it was in userspace or kernel.

The backtrace interface oprofile_add_sample does not allow this.  Create
oprofile_add_ext_sample and make oprofile_add_sample use it too.

Signed-off-by: Anton Blanchard 
Cc: Philippe Elie 
Cc: John Levon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds