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msm-4.14/arch/powerpc/kernel
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Anton Blanchard 4bca770ede powerpc: perf: Fix frequency calculation for overflowing counters 
When profiling a benchmark that is almost 100% userspace, I noticed some wildly
inaccurate profiles that showed almost all time spent in the kernel.

Closer examination shows we were programming a tiny number of cycles into the
PMU after each overflow (about ~200 away from the next overflow). This gets us
stuck in a loop which we eventually break out of by throttling the PMU (there
are regular throttle/unthrottle events in the log).

It looks like we aren't setting event->hw.last_period to something same and the
frequency to period calculations in perf are going haywire.

With the following patch we find the correct period after a few interrupts and
stay there. I also see no more throttle events.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
LKML-Reference: <20110117161742.5feb3761@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-01-17 11:43:02 +01:00
..
vdso32
powerpc/Makefiles: Change to new flag variables
2010-10-13 16:19:22 +11:00
vdso64
powerpc/Makefiles: Change to new flag variables
2010-10-13 16:19:22 +11:00
.gitignore
…
align.c
powerpc: Remove fpscr use from [kvm_]cvt_{fd,df}
2010-09-02 14:07:32 +10:00
asm-offsets.c
Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2010-10-24 12:47:25 -07:00
audit.c
…
btext.c
lmb: rename to memblock
2010-07-14 17:14:00 +10:00
cacheinfo.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
cacheinfo.h
powerpc: Rewrite sysfs processor cache info code
2009-01-08 16:25:10 +11:00
clock.c
…
compat_audit.c
…
cpu_setup_6xx.S
powerpc: Use names rather than numbers for SPRGs (v2)
2009-08-20 10:12:27 +10:00
cpu_setup_44x.S
powerpc/44x: Add support for the AMCC APM821xx SoC
2010-10-13 08:47:09 -04:00
cpu_setup_fsl_booke.S
powerpc/fsl-booke: Add support for FSL 64-bit e5500 core
2010-10-14 00:55:03 -05:00
cpu_setup_pa6t.S
…
cpu_setup_ppc970.S
…
cputable.c
Merge remote branch 'jwb/next' into next
2010-10-15 10:45:03 +11:00
crash_dump.c
Merge commit 'gcl/next' into next
2010-08-04 10:26:03 +10:00
crash.c
powerpc/kexec: make masking/disabling interrupts generic
2010-10-14 00:52:46 -05:00
dbell.c
powerpc/book3e: Resend doorbell exceptions to ourself
2010-07-09 16:11:19 +10:00
dma-iommu.c
powerpc/dma: Fix dma_iommu_dma_supported compare
2010-10-13 16:19:21 +11:00
dma-swiotlb.c
of: Merge of_platform_bus_type with platform_bus_type
2010-07-24 09:57:51 -06:00
dma.c
powerpc/dma: Fix check for direct DMA support
2010-10-13 16:19:21 +11:00
e500-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
entry_32.S
powerpc/47x: Base ppc476 support
2010-05-05 09:11:10 -04:00
entry_64.S
powerpc: Account time using timebase rather than PURR
2010-09-02 14:07:31 +10:00
exceptions-64e.S
powerpc/book3e: Fix single step when using HW page tables
2010-07-14 14:13:51 +10:00
exceptions-64s.S
Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2010-10-24 12:47:25 -07:00
firmware.c
powerpc: Make powerpc_firmware_features __read_mostly
2010-02-09 13:56:07 +11:00
fpu.S
powerpc: Remove fpscr use from [kvm_]cvt_{fd,df}
2010-09-02 14:07:32 +10:00
fsl_booke_entry_mapping.S
powerpc/fsl-booke: Fix address issue when using relocatable kernels
2010-07-11 11:04:08 -05:00
ftrace.c
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-06-20 10:56:46 -07:00
head_8xx.S
powerpc/8xx: Use SPRG2 and DAR registers to stash r11 and cr.
2010-04-07 18:00:34 +10:00
head_32.S
KVM: PPC: Add KVM intercept handlers
2010-05-17 12:18:52 +03:00
head_40x.S
memblock: Remove rmo_size, burry it in arch/powerpc where it belongs
2010-08-05 12:56:08 +10:00
head_44x.S
powerpc/47x: Make sure mcsr is cleared before enabling machine check interrupts
2010-08-23 07:36:58 -04:00
head_64.S
KVM: PPC: Move KVM trampolines before __end_interrupts
2010-10-24 10:50:59 +02:00
head_booke.h
powerpc/booke: Add Stack Marking support to Booke Exception Prolog
2010-05-05 08:01:52 -04:00
head_fsl_booke.S
powerpc/fsl_booke: Add support to boot from core other than 0
2010-10-14 00:52:58 -05:00
hw_breakpoint.c
powerpc, hw_breakpoint: Tell generic code we have no instruction breakpoints
2010-06-30 13:54:58 +10:00
ibmebus.c
of/device: Rework to use common platform_device_alloc() for allocating devices
2010-10-21 11:10:10 -06:00
idle_6xx.S
…
idle_book3e.S
powerpc/book3e: Add generic 64-bit idle powersave support
2010-07-14 14:13:18 +10:00
idle_e500.S
…
idle_power4.S
…
idle.c
powerpc: Re-enable preemption before cpu_die()
2010-08-24 15:26:29 +10:00
init_task.c
Use new __init_task_data macro in arch init_task.c files.
2009-09-21 06:27:08 +02:00
io.c
powerpc: tiny memcpy_(to|from)io optimisation
2009-11-04 16:43:12 -07:00
iomap.c
…
iommu.c
powerpc: Remove unused 'protect4gb' boot parameter
2010-05-21 17:31:13 +10:00
irq.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2010-10-21 21:19:54 -07:00
isa-bridge.c
…
kgdb.c
kgdb,ppc: Fix regression in evr register handling
2010-11-17 13:54:58 -06:00
kprobes.c
powerpc/kprobes: Remove resume_execution() in kprobes
2010-06-02 17:50:37 +10:00
kvm_emul.S
KVM: PPC: Make PV mtmsrd L=1 work with r30 and r31
2010-10-24 10:52:14 +02:00
kvm.c
PPC: KVM: Book E doesn't have __end_interrupts.
2010-11-05 14:42:27 -02:00
l2cr_6xx.S
…
legacy_serial.c
powerpc, of_serial: Endianness issues setting up the serial ports
2010-10-07 17:21:15 -06:00
lparcfg.c
Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
2010-10-22 10:52:56 -07:00
machine_kexec_32.c
powerpc/kexec: make masking/disabling interrupts generic
2010-10-14 00:52:46 -05:00
machine_kexec_64.c
powerpc/kexec: Fix orphaned offline CPUs across kexec
2010-07-31 15:05:22 +10:00
machine_kexec.c
powerpc/kexec: make masking/disabling interrupts generic
2010-10-14 00:52:46 -05:00
Makefile
Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2010-10-24 12:47:25 -07:00
misc_32.S
powerpc/kexec: Adds correct calling convention for kexec purgatory
2010-08-31 11:35:12 +10:00
misc_64.S
powerpc: Unconditionally enabled irq stacks
2010-06-15 15:02:37 +10:00
misc.S
perf: Drop the skip argument from perf_arch_fetch_regs_caller
2010-06-08 23:31:27 +02:00
module_32.c
…
module_64.c
powerpc: Unify opcode definitions and support
2009-02-23 10:48:56 +11:00
module.c
powerpc: remove unused variable
2010-10-05 17:27:54 -07:00
mpc7450-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
msi.c
powerpc/PCI: include pci.h in powerpc MSI implementation
2009-03-25 08:54:29 -07:00
nvram_64.c
arch/powerpc: Fix continuation line formats
2010-02-09 13:55:05 +11:00
of_platform.c
of: remove of_default_bus_ids
2010-07-24 09:58:22 -06:00
paca.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2010-10-21 21:19:54 -07:00
pci_32.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
pci_64.c
of: add 'of_' prefix to machine_is_compatible()
2010-02-09 08:33:00 -07:00
pci_dn.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
pci_of_scan.c
powerpc/pci: Fix checking for child bridges in PCI code.
2010-08-24 15:28:27 +10:00
pci-common.c
powerpc/pci: Cleanup device dma setup code
2010-10-13 16:19:22 +11:00
perf_callchain.c
perf: Factorize callchain context handling
2010-08-19 01:32:11 +02:00
perf_event_fsl_emb.c
perf: Dynamic pmu types
2010-12-16 11:36:43 +01:00
perf_event.c
powerpc: perf: Fix frequency calculation for overflowing counters
2011-01-17 11:43:02 +01:00
pmc.c
powerpc: Convert pmc_owner_lock to raw_spinlock
2010-02-19 14:52:33 +11:00
power4-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power5-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power5+-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power6-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
power7-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
ppc32.h
…
ppc970-pmu.c
perf, arch: Cleanup perf-pmu init vs lockup-detector
2010-11-26 15:14:56 +01:00
ppc_ksyms.c
KVM: PPC: elide struct thread_struct instances from stack
2010-08-01 10:39:24 +03:00
ppc_save_regs.S
…
proc_powerpc.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
process.c
powerpc: Account time using timebase rather than PURR
2010-09-02 14:07:31 +10:00
prom_init_check.sh
powerpc: Fix compile errors in prom_init_check for gcc 4.5
2010-07-08 18:11:39 +10:00
prom_init.c
powerpc: Print decimal values in prom_init.c
2010-07-31 15:05:20 +10:00
prom_parse.c
of/address: Merge all of the bus translation code
2010-07-05 16:14:26 -06:00
prom.c
Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6
2010-10-25 08:19:14 -07:00
ptrace32.c
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
ptrace.c
ptrace: cleanup arch_ptrace() on powerpc
2010-10-27 18:03:11 -07:00
reloc_64.S
…
rtas_flash.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
rtas_pci.c
powerpc/pci: Clean up direct access to sysdata by RTAS
2009-05-21 15:44:23 +10:00
rtas-proc.c
powerpc: Move /proc/ppc64 to /proc/powerpc update
2010-01-15 13:26:17 +11:00
rtas-rtc.c
…
rtas.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2010-10-21 21:19:54 -07:00
rtasd.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
setup_32.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2010-10-21 21:19:54 -07:00
setup_64.c
powerpc: Update a BKL related comment
2010-11-18 14:54:24 +11:00
setup-common.c
powerpc: fix i8042 module build error
2010-08-06 20:49:20 -06:00
setup.h
…
signal_32.c
powerpc: fix double syscall restarts
2010-09-22 09:33:50 -07:00
signal_64.c
powerpc: fix double syscall restarts
2010-09-22 09:33:50 -07:00
signal.c
powerpc: fix double syscall restarts
2010-09-22 09:33:50 -07:00
signal.h
powerpc: Sanitize stack pointer in signal handling code
2009-03-27 16:58:24 +11:00
smp-tbsync.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
smp.c
powerpc: Account time using timebase rather than PURR
2010-09-02 14:07:31 +10:00
softemu8xx.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
stacktrace.c
…
suspend.c
update email address
2010-07-19 10:56:54 +02:00
swsusp_32.S
powerpc/swsusp_32: Fix TLB invalidation
2010-01-15 13:20:07 +11:00
swsusp_64.c
…
swsusp_asm64.S
…
swsusp_booke.S
powerpc/fsl-booke: Add hibernation support for FSL BookE processors
2010-05-21 07:41:53 -05:00
swsusp.c
…
sys_ppc32.c
BKL: remove extraneous #include <smp_lock.h>
2010-11-17 08:59:32 -08:00
syscalls.c
Add generic sys_olduname()
2010-03-12 15:52:32 -08:00
sysfs.c
powerpc: Use smt_snooze_delay=-1 to always busy loop
2010-05-21 17:31:12 +10:00
systbl_chk.c
…
systbl_chk.sh
…
systbl.S
…
tau_6xx.c
tree-wide: fix assorted typos all over the place
2009-12-04 15:39:55 +01:00
time.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2010-10-21 21:19:54 -07:00
traps.c
powerpc/fsl-booke: Add support for FSL 64-bit e5500 core
2010-10-14 00:55:03 -05:00
udbg_16550.c
trivial: fix typo "for for" in multiple files
2009-09-21 15:14:54 +02:00
udbg.c
powerpc: gamecube/wii: early debugging using usbgecko
2009-12-12 22:24:31 -07:00
vdso.c
powerpc: Use is_32bit_task() helper to test 32-bit binary
2010-09-02 14:07:32 +10:00
vecemu.c
…
vector.S
powerpc: Fix usage of 64-bit instruction in 32-bit altivec code
2009-12-09 18:10:12 +11:00
vio.c
replace nested max/min macros with {max,min}3 macro
2010-10-26 16:52:12 -07:00
vmlinux.lds.S
Rename .data.read_mostly to .data..read_mostly.
2010-03-03 11:26:00 +01:00