13 Sep, 2011
1 commit
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The oprofilefs_lock can be taken in atomic context (in profiling
interrupts) and therefore cannot cannot be preempted on -rt -
annotate it.In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
27 Jul, 2011
1 commit
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This allows us to move duplicated code in
(atomic_inc_not_zero() for now) toSigned-off-by: Arun Sharma
Reviewed-by: Eric Dumazet
Cc: Ingo Molnar
Cc: David Miller
Cc: Eric Dumazet
Acked-by: Mike Frysinger
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
15 Feb, 2011
3 commits
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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
Signed-off-by: Robert Richter -
OProfile is enhanced to export all files for controlling System z's
hardware sampling, and to invoke hwsampler exported functions to
initialize and use System z's hardware sampling.The patch invokes hwsampler_setup() during oprofile init and exports
following hwsampler files under oprofilefs if hwsampler's setup
succeeded:A new directory for hardware sampling based files
/dev/oprofile/hwsampling/
The userland daemon must explicitly write to the following files
to disable (or enable) hardware based sampling/dev/oprofile/hwsampling/hwsampler
to modify the actual sampling rate
/dev/oprofile/hwsampling/hw_interval
to modify the amount of sampling memory (measured in 4K pages)
/dev/oprofile/hwsampling/hw_sdbt_blocks
The following files are read only and show
the possible minimum sampling rate/dev/oprofile/hwsampling/hw_min_interval
the possible maximum sampling rate
/dev/oprofile/hwsampling/hw_max_interval
The patch splits the oprofile_timer_[init/exit] function so that it
can be also called through user context (oprofilefs) to avoid kernel
oops.Applied with following changes:
* whitespace changes in Makefile and timer_int.cSigned-off-by: Mahesh Salgaonkar
Signed-off-by: Maran Pakkirisamy
Signed-off-by: Heinz Graalfs
Acked-by: Heiko Carstens
Signed-off-by: Robert Richter -
This patch introduces a new oprofile sample add function
(oprofile_add_ext_hw_sample) that can also take task_struct as an
argument, which is used by the hwsampler kernel module when copying
hardware samples to OProfile buffers.Applied with following changes:
* removed #include
* whitespace changes
* removed conditional compilation (CONFIG_HAVE_HWSAMPLER)
* modified order of functions
* fix missing function definition in header fileSigned-off-by: Mahesh Salgaonkar
Signed-off-by: Maran Pakkirisamy
Signed-off-by: Heinz Graalfs
Acked-by: Heiko Carstens
Signed-off-by: Robert Richter
27 Jan, 2011
2 commits
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Always allow backtraces when using oprofile on ARM, even if a PMU
isn't present. Restores functionality originally introduced in commit
1b7b56982fdcd9d85effd76f3928cf5d6eb26155 ("oprofile: Always allow
backtraces on ARM") by Richard Purdie.It is not that obvious, but there is now only one oprofile_arch_init()
function. So the .backtrace callback is available also in timer mode.Implemented by removing code and using stubs for oprofile_perf_{init,
exit} provided by . This allows cleaning of other
architecture specific implementations too.Cc: stable@kernel.org # 37.x
Signed-off-by: Ari Kauppi
Acked-by: Will Deacon
Signed-off-by: Robert Richter -
The implementations are flagged in Makefile with CONFIG_HW_PERF_EVENTS
instead of CONFIG_PERF_EVENTS.Cc: stable@kernel.org # 37.x
Signed-off-by: Ari Kauppi
Signed-off-by: Robert Richter
15 Oct, 2010
1 commit
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Commit e9677b3ce (oprofile, ARM: Use oprofile_arch_exit() to
cleanup on failure) caused oprofile_perf_exit to be called
in the cleanup path of oprofile_perf_init. The __exit tag
for oprofile_perf_exit should therefore be dropped.The same has to be done for exit_driverfs as well, as this
function is called from oprofile_perf_exit. Else, we get
the following two linker errors.LD .tmp_vmlinux1
`oprofile_perf_exit' referenced in section `.init.text' of arch/arm/oprofile/built-in.o: defined in discarded section `.exit.text' of arch/arm/oprofile/built-in.o
make: *** [.tmp_vmlinux1] Error 1LD .tmp_vmlinux1
`exit_driverfs' referenced in section `.text' of arch/arm/oprofile/built-in.o: defined in discarded section `.exit.text' of arch/arm/oprofile/built-in.o
make: *** [.tmp_vmlinux1] Error 1Signed-off-by: Anand Gadiyar
Cc: Will Deacon
Signed-off-by: Robert Richter
11 Oct, 2010
2 commits
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Move the perf-events backend from arch/arm/oprofile into
drivers/oprofile so that the code can be shared between architectures.This allows each architecture to maintain only a single copy of the PMU
accessor functions instead of one for both perf and OProfile. It also
becomes possible for other architectures to delete much of their
OProfile code in favour of the common code now available in
drivers/oprofile/oprofile_perf.c.Signed-off-by: Matt Fleming
Tested-by: Will Deacon
Signed-off-by: Robert Richter -
Make op_name_from_perf_id() global so that we have a way for each
architecture to construct an oprofile name for op->cpu_type. We need to
remove the argument from the function prototype so that we can hide all
implementation details inside the function.Signed-off-by: Matt Fleming
Signed-off-by: Robert Richter
20 Jul, 2009
1 commit
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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
12 Jun, 2009
1 commit
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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
11 Jun, 2009
1 commit
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This became obsolete with this commit:
304cc6a ring_buffer: remove unused flags parameter, fix
Signed-off-by: Robert Richter
08 Jan, 2009
1 commit
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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
10 Dec, 2008
1 commit
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The cpu argument is no longer part of the parameter list.
Signed-off-by: Robert Richter
21 Oct, 2008
1 commit
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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
26 Jul, 2008
1 commit
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Signed-off-by: Robert Richter
Cc: oprofile-list
Cc: Barry Kasindorf
Signed-off-by: Ingo Molnar
21 Jul, 2007
1 commit
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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
29 Mar, 2006
2 commits
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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 -
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
17 Apr, 2005
1 commit
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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.Let it rip!
