| Commit message (Collapse) | Author | Age |
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Fix a build warning on 32bit machines by explicitly marking the
constants as 64-bit.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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We need to ensure the enabled=0 write happens before we
start disabling the actual counters, so that a pcm_amd_enable()
will not enable one underneath us.
I think the race is impossible anyway, we always balance the
ops within any one context and perform enable() with IRQs disabled.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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No need to assume the irq_period is 32bit.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Merge reason: we have gathered quite a few conflicts, need to merge upstream
Conflicts:
arch/powerpc/kernel/Makefile
arch/x86/ia32/ia32entry.S
arch/x86/include/asm/hardirq.h
arch/x86/include/asm/unistd_32.h
arch/x86/include/asm/unistd_64.h
arch/x86/kernel/cpu/common.c
arch/x86/kernel/irq.c
arch/x86/kernel/syscall_table_32.S
arch/x86/mm/iomap_32.c
include/linux/sched.h
kernel/Makefile
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Remove unused variables and duplicate header file.
Signed-off-by: Jaswinder Singh Rajput <jaswinder@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Use and actual unsigned long bitmap instead of casting our way around.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>
LKML-Reference: <1236508459.22914.3645.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The BKGD suggests that counter width on AMD CPUs is 48 for all
existing models (it certainly is for mine).
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The below completes the K7+ performance counter support:
- IRQ support
- NMI support
KernelTop output works now as well.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1236273633.5187.286.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: cleanup
using pr_info in perf_counter.c fixes various 80 characters warnings and
also indenting for conditional statement
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: cleanup
making decent declrations for struct pmc_x86_ops and
fix checkpatch error:
ERROR: Macros with complex values should be enclosed in parenthesis
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Supported basic performance counter for AMD K7 and later:
$ perfstat -e 0,1,2,3,4,5,-1,-2,-3,-4,-5 ls > /dev/null
Performance counter stats for 'ls':
12.298610 task clock ticks (msecs)
3298477 CPU cycles (events)
1406354 instructions (events)
749035 cache references (events)
16939 cache misses (events)
100589 branches (events)
11159 branch misses (events)
7.627540 cpu clock ticks (msecs)
12.298610 task clock ticks (msecs)
500 pagefaults (events)
6 context switches (events)
3 CPU migrations (events)
Wall-clock time elapsed: 8.672290 msecs
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Introduced struct pmc_x86_ops to add more cpus.
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
arch/x86/kernel/apic/apic.c
arch/x86/kernel/irqinit_32.c
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
arch/x86/kernel/cpu/perfctr-watchdog.c
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Conflicts:
arch/x86/Kconfig
arch/x86/kernel/apic.c
arch/x86/kernel/setup_percpu.c
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Conflicts:
arch/x86/kernel/acpi/boot.c
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git://git.kernel.org/pub/scm/linux/kernel/git/paulus/perfcounters into perfcounters/core
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Impact: new perf_counter feature
This extends the perf_counter_hw_event struct with bits that specify
that events in user, kernel and/or hypervisor mode should not be
counted (i.e. should be excluded), and adds code to program the PMU
mode selection bits accordingly on x86 and powerpc.
For software counters, we don't currently have the infrastructure to
distinguish which mode an event occurs in, so we currently fail the
counter initialization if the setting of the hw_event.exclude_* bits
would require us to distinguish. Context switches and CPU migrations
are currently considered to occur in kernel mode.
On x86, this changes the previous policy that only root can count
kernel events. Now non-root users can count kernel events or exclude
them. Non-root users still can't use NMI events, though. On x86 we
don't appear to have any way to control whether hypervisor events are
counted or not, so hw_event.exclude_hv is ignored.
On powerpc, the selection of whether to count events in user, kernel
and/or hypervisor mode is PMU-wide, not per-counter, so this adds a
check that the hw_event.exclude_* settings are the same as other events
on the PMU. Counters being added to a group have to have the same
settings as the other hardware counters in the group. Counters and
groups can only be enabled in hw_perf_group_sched_in or power_perf_enable
if they have the same settings as any other counters already on the
PMU. If we are not running on a hypervisor, the exclude_hv setting
is ignored (by forcing it to 0) since we can't ever get any
hypervisor events.
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Conflicts:
arch/x86/kernel/setup_percpu.c
arch/x86/mm/fault.c
drivers/acpi/processor_idle.c
kernel/irq/handle.c
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I noticed that kerneltop interrupts were accounted as NMI, but not their
perf counter origin.
Account NMI performance counter interrupts.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/cpu/perf_counter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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With oprofile as a module, and unloaded by profiling script,
both oprofile and kerneltop work fine.. unless you leave kerneltop
running when you start profiling, then you may see badness.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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perf_counter.c::perf_counters_lapic_init()
Fix:
WARNING: arch/x86/kernel/built-in.o(.text+0xdd0f): Section mismatch in reference from the function pmc_generic_enable() to the function .cpuinit.text:perf_counters_lapic_init()
The function pmc_generic_enable() references
the function __cpuinit perf_counters_lapic_init().
This is often because pmc_generic_enable lacks a __cpuinit
annotation or the annotation of perf_counters_lapic_init is wrong.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Ratelimit performance counter interrupts to 100KHz per CPU.
This replaces the irq-delta-time based method.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Starting kerneltop with only -c 100 seems to be a bad idea, it can
easily lock the system due to perfcounter IRQ overload.
So add throttling: if a new IRQ arrives in a shorter than
PERFMON_MIN_PERIOD_NS time, turn off perfcounters and untrottle them
from the next timer tick.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
arch/x86/include/asm/hardirq_32.h
arch/x86/include/asm/hardirq_64.h
Semantic merge:
arch/x86/include/asm/hardirq.h
[ added apic_perf_irqs field. ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
arch/x86/include/asm/pda.h
We merge tip/core/percpu into tip/perfcounters/core because of a
semantic and contextual conflict: the former eliminates the PDA,
while the latter extends it with apic_perf_irqs field.
Resolve the conflict by moving the new field to the irq_cpustat
structure on 64-bit too.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
include/linux/kernel_stat.h
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Conflicts:
fs/exec.c
include/linux/init_task.h
Simple context conflicts.
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Impact: clean, reduce kernel size a bit, avoid sparse warnings
Fixes sparse warnings:
arch/x86/kernel/cpu/perf_counter.c:153:6: warning: symbol 'hw_perf_enable_all' was not declared. Should it be static?
arch/x86/kernel/cpu/perf_counter.c:279:3: warning: returning void-valued expression
arch/x86/kernel/cpu/perf_counter.c:206:3: warning: returning void-valued expression
arch/x86/kernel/cpu/perf_counter.c:206:3: warning: returning void-valued expression
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: extend performance counter support on x86 Intel CPUs
Modern Intel CPUs have 3 "fixed-function" performance counters, which
count these hardware events:
Instr_Retired.Any
CPU_CLK_Unhalted.Core
CPU_CLK_Unhalted.Ref
Add support for them to the performance counters subsystem.
Their use is transparent to user-space: the counter scheduler is
extended to automatically recognize the cases where a fixed-function
PMC can be utilized instead of a generic PMC. In such cases the
generic PMC is kept available for more counters.
The above fixed-function events map to these generic counter hw events:
PERF_COUNT_INSTRUCTIONS
PERF_COUNT_CPU_CYCLES
PERF_COUNT_BUS_CYCLES
(The 'bus' cycles are in reality often CPU-ish cycles, just with a fixed
frequency.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Generalize "bus cycles" hw events - and map them to CPU_CLK_Unhalted.Ref
on x86. (which is a good enough approximation)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: extend debug printouts
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Allow lowlevel ->enable() op to return an error if a counter can not be
added. This can be used to handle counter constraints.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: rename field names
Shorten them.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: clean up
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Enumerate fixed-mode PMCs based on CPUID, and feed that into the
perfcounter code.
Does not use fixed-mode PMCs yet.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: refactor the x86 code for fixed-mode PMCs
Extend the data structures and rename the existing facilities
to allow for a 'generic' versus 'fixed' counter distinction.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: rename include file
We'll be providing an asm/perf_counter.h to the generic perfcounter code,
so use the already existing x86 file for this purpose and rename it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: remove debug checks
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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should be static
Impact: cleanup, avoid sparse warnings, reduce kernel size a bit
Fixes these sparse warnings:
arch/x86/kernel/cpu/perf_counter.c:44:11: warning: symbol 'intel_perfmon_event_map' was not declared. Should it be static?
arch/x86/kernel/cpu/perf_counter.c:54:11: warning: symbol 'max_intel_perfmon_events' was not declared. Should it be static?
Signed-off-by: Jaswinder Singh <jaswinder@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Fix non-working NMI sampling in certain bootup scenarios.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Do not write MSR_CORE_PERF_GLOBAL_CTRL on CPUs where it does not exist.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: restructure code
Change counter math from absolute values to clear delta logic.
We try to extract elapsed deltas from the raw hw counter - and put
that into the generic counter.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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( with manual semantic merge of arch/x86/kernel/cpu/perf_counter.c )
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Impact: cleanup
Introduce a proper enum for the 3 states of a counter:
PERF_COUNTER_STATE_OFF = -1
PERF_COUNTER_STATE_INACTIVE = 0
PERF_COUNTER_STATE_ACTIVE = 1
and rename counter->active to counter->state and propagate the
changes everywhere.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: cleanup
Rename them to better match up the usual IRQ disable/enable APIs:
hw_perf_disable_all() => hw_perf_save_disable()
hw_perf_restore_ctrl() => hw_perf_restore()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: add new perf-counter type
The 'CPU clock' counter counts the amount of CPU clock time that is
elapsing, in nanoseconds. (regardless of how much of it the task is
spending on a CPU executing)
This counter type is a Linux kernel based abstraction, it is available
even if the hardware does not support native hardware performance counters.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: restructure code, introduce hw_ops driver abstraction
Introduce this abstraction to handle counter details:
struct hw_perf_counter_ops {
void (*hw_perf_counter_enable) (struct perf_counter *counter);
void (*hw_perf_counter_disable) (struct perf_counter *counter);
void (*hw_perf_counter_read) (struct perf_counter *counter);
};
This will be useful to support assymetric hw details, and it will also
be useful to implement "software counters". (Counters that count kernel
managed sw events such as pagefaults, context-switches, wall-clock time
or task-local time.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: add group counters
This patch adds the "counter groups" abstraction.
Groups of counters behave much like normal 'single' counters, with a
few semantic and behavioral extensions on top of that.
A counter group is created by creating a new counter with the open()
syscall's group-leader group_fd file descriptor parameter pointing
to another, already existing counter.
Groups of counters are scheduled in and out in one atomic group, and
they are also roundrobin-scheduled atomically.
Counters that are member of a group can also record events with an
(atomic) extended timestamp that extends to all members of the group,
if the record type is set to PERF_RECORD_GROUP.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Impact: clean up new API
Thorough cleanup of the new perf counters API, we now get clean separation
of the various concepts:
- introduce perf_counter_hw_event to separate out the event source details
- move special type flags into separate attributes: PERF_COUNT_NMI,
PERF_COUNT_RAW
- extend the type to u64 and reserve it fully to the architecture in the
raw type case.
And make use of all these changes in the core and x86 perfcounters code.
Also change the syscall signature to:
asmlinkage int sys_perf_counter_open(
struct perf_counter_hw_event *hw_event_uptr __user,
pid_t pid,
int cpu,
int group_fd);
( Note that group_fd is unused for now - it's reserved for the counter
groups abstraction. )
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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