linux/arch/powerpc/oprofile
Carl Love a5598ca0d4 powerpc/oprofile: Fix mutex locking for cell spu-oprofile
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 <carll@us.ibm.com>
Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Acked-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2008-10-21 15:17:48 +11:00
..
cell powerpc/oprofile: Fix mutex locking for cell spu-oprofile 2008-10-21 15:17:48 +11:00
backtrace.c [POWERPC] powerpc oprofile __user annotations 2006-09-26 15:25:33 +10:00
common.c on_each_cpu(): kill unused 'retry' parameter 2008-06-26 11:24:38 +02:00
Makefile [POWERPC] Made FSL Book-E PMC support more generic 2008-02-05 23:34:14 -06:00
op_model_7450.c [CELL] oprofile: add support to OProfile for profiling CELL BE SPUs 2007-07-20 21:42:24 +02:00
op_model_cell.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
op_model_fsl_emb.c [POWERPC] Made FSL Book-E PMC support more generic 2008-02-05 23:34:14 -06:00
op_model_pa6t.c [CELL] oprofile: add support to OProfile for profiling CELL BE SPUs 2007-07-20 21:42:24 +02:00
op_model_power4.c powerpc: Expose PMCs & cache topology in sysfs on 32-bit 2008-08-20 16:34:58 +10:00
op_model_rs64.c [CELL] oprofile: add support to OProfile for profiling CELL BE SPUs 2007-07-20 21:42:24 +02:00