]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
powerpc/oprofile: Fix mutex locking for cell spu-oprofile
authorCarl Love <cel@us.ibm.com>
Tue, 14 Oct 2008 23:37:01 +0000 (23:37 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 21 Oct 2008 04:17:48 +0000 (15:17 +1100)
commita5598ca0d49821912a5053c05f07fd650671eb6d
treefcfa402eeb45f76fbb03886708e5042fe5f1babb
parentbb5e6491cae4c5d6ddfa3e173e22efb35f595949
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>
arch/powerpc/oprofile/cell/pr_util.h
arch/powerpc/oprofile/cell/spu_profiler.c
arch/powerpc/oprofile/cell/spu_task_sync.c
drivers/oprofile/buffer_sync.c
drivers/oprofile/cpu_buffer.c
drivers/oprofile/event_buffer.h
include/linux/oprofile.h