16 Feb, 2011
1 commit
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…/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Fix text_poke_smp_batch() deadlock
perf tools: Fix thread_map event synthesizing in top and record
watchdog, nmi: Lower the severity of error messages
ARM: oprofile: Fix backtraces in timer mode
oprofile: Fix usage of CONFIG_HW_PERF_EVENTS for oprofile_perf_init and friends
10 Feb, 2011
1 commit
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Since tail is the previous fp - 1, we need to compare the new fp with tail + 1
to ensure that we don't end up passing in the same tail again, in order to
avoid a potential infinite loop in the perf interrupt handler (which has been
observed to occur). A similar fix seems to be needed in the OProfile code.Acked-by: Will Deacon
Signed-off-by: Rabin Vincent
Signed-off-by: Russell King
27 Jan, 2011
1 commit
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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
11 Oct, 2010
5 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 -
In preparation for moving the majority of this oprofile code into an
architecture-neutral place separate the architecture-independent code
into oprofile_perf_init() and oprofile_perf_exit().Signed-off-by: Matt Fleming
Tested-by: Will Deacon
Signed-off-by: Robert Richter -
In preparation for moving the generic functions out of this file, give
the functions more general names (e.g. remove "arm" from the names).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 -
The number of counters for the registered pmu is needed in a few places
so provide a helper function that returns this number.Signed-off-by: Matt Fleming
Tested-by: Will Deacon
Acked-by: Paul Mundt
Acked-by: Peter Zijlstra
Signed-off-by: Robert Richter
31 Aug, 2010
2 commits
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The pointers must be NULL'ed to avoid double-freeing the pointers in
rare cases during reinitialization.Signed-off-by: Robert Richter
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Now that oprofile_arch_exit is only called when the OProfile module
is unloaded, it can assume that init completed successfully and not
have to worry about double frees or releasing NULL perf events.This patch ensures that oprofile_arch_init fails gracefully on ARM
and simplifies the exit code based on the above.Cc: Robert Richter
Cc: Matt Fleming
Cc: Peter Zijlstra
Cc: Ingo Molnar
Signed-off-by: Will Deacon
Signed-off-by: Robert Richter
17 May, 2010
2 commits
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This is a reworking of an original patch posted by Aaro Koskinen:
oprofile does not work with PM, because sysdev_suspend() is done with
interrupts disabled and oprofile needs a mutex. Implementing oprofile
as a platform device solves this problem.Cc: Aaro Koskinen
Signed-off-by: Will Deacon
Signed-off-by: Aaro Koskinen
Signed-off-by: Russell King -
There are currently two hardware performance monitoring subsystems in
the kernel for ARM: OProfile and perf-events. This creates the
following problems:1.) Duplicate PMU accessor code. Inevitable code drift may lead to
bugs in one framework that are fixed in the other.2.) Locking issues. OProfile doesn't reprogram hardware counters
between profiling runs if the events to be monitored have not been
changed. This means that other profiling frameworks cannot use the
counters if OProfile is in use.3.) Due to differences in the two frameworks, it may not be possible to
compare the results obtained by OProfile with those obtained by perf.This patch removes the OProfile PMU driver code and replaces it with
calls to perf, therefore solving the issues mentioned above.The only userspace-visible change is the lack of SCU counter support
for 11MPCore. This is currently unsupported by OProfile userspace tools anyway and therefore shouldn't cause any problems.Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Robert Richter
Cc: Jamie Iles
Cc: Jean Pihet
Signed-off-by: Will Deacon
Signed-off-by: Russell King
01 Sep, 2008
1 commit
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Add Oprofile kernel support for ARMv7.
Tested on OMAP3430 and OMAP3530 chipsets (Cortex-A8).Signed-off-by: Jean Pihet
Signed-off-by: Russell King
25 Jan, 2008
1 commit
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All kobjects require a dynamically allocated name now. We no longer
need to keep track if the name is statically assigned, we can just
unconditionally free() all kobject names on cleanup.Signed-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
02 Mar, 2007
1 commit
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Always allow backtrace when using oprofile on ARM, even if a PMU
isn't present.Signed-off-by: Richard Purdie
Signed-off-by: Russell King
07 Feb, 2007
2 commits
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Add the glue for ARM11 SMP oprofile support, which also supports the
performance monitor in the coherency unit.Signed-off-by: Russell King
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Add oprofile glue for ARM11 (ARMv6) oprofile support. This
connects the ARM11 core profiling support to the oprofile code
for uniprocessor configurations.Signed-off-by: Russell King
22 Mar, 2006
3 commits
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We need this to be zero initialised. Since this is an array, use kcalloc
rather than kzalloc or kmalloc.Signed-off-by: Russell King
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Signed-off-by: Russell King
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op_arm_sem is being used as a mutex, so convert it to use
real mutexes.Signed-off-by: Russell King
02 Feb, 2006
1 commit
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Patch from Russ Dill
The oprofile init code was broken in commit c6b9da. The new logic will
always return -ENODEV. This fixes oprofile_arch_init to return 0 on
success, and return the return value of spec->init() if applicable.Signed-off-by: Russ Dill
Signed-off-by: Russell King
28 Oct, 2005
4 commits
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There is nothing special about having the init code separate from
the common code, so combine the two.Signed-off-by: Russell King
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The common oprofile code assumes the name "PMU" (from Intel's
performance management unit). This is misleading when we
start adding oprofile support for other machine types which
don't use the same terminology. Call it op_arm_* instead of
pmu_*.Signed-off-by: Russell King
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The oprofile suspend/resume was missing locking. If we failed
to start oprofile on resume, we still reported that it was
enabled. Instead, disable oprofile on error.Signed-off-by: Russell King
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Signed-off-by: Russell King
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!
