linux/arch/powerpc
Anton Blanchard 9a45a9407c powerpc/perf: power_pmu_start restores incorrect values, breaking frequency events
perf on POWER stopped working after commit e050e3f0a7 (perf: Fix
broken interrupt rate throttling). That patch exposed a bug in
the POWER perf_events code.

Since the PMCs count upwards and take an exception when the top bit
is set, we want to write 0x80000000 - left in power_pmu_start. We were
instead programming in left which effectively disables the counter
until we eventually hit 0x80000000. This could take seconds or longer.

With the patch applied I get the expected number of samples:

          SAMPLE events:       9948

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: <stable@kernel.org>
2012-02-16 16:24:35 +11:00
..
boot powerpc/85xx: Add dr_mode property in USB nodes 2012-01-18 08:05:42 -06:00
configs powerpc: Remove legacy iSeries from ppc64_defconfig 2012-02-16 16:15:08 +11:00
include/asm powerpc/pseries/eeh: Fix crash when error happens during device probe 2012-02-14 15:01:39 +11:00
kernel powerpc/perf: power_pmu_start restores incorrect values, breaking frequency events 2012-02-16 16:24:35 +11:00
kvm Merge branch 'kvm-updates/3.3' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-01-10 09:57:11 -08:00
lib powerpc: POWER7 optimised copy_to_user/copy_from_user using VMX 2011-12-19 14:40:40 +11:00
math-emu
mm cpumask: update setup_node_to_cpumask_map() comments 2012-01-12 20:13:11 -08:00
net
oprofile
platforms powerpc/pseries/eeh: Fix crash when error happens during device probe 2012-02-14 15:01:39 +11:00
sysdev powerpc/fsl/pci: Fix PCIe fixup regression 2012-02-16 16:15:03 +11:00
xmon powerpc/xmon: Fix #if typo for systems without MSR[RI] 2011-11-25 14:11:28 +11:00
Kconfig lib: use generic pci_iomap on all architectures 2012-01-10 18:04:27 -08:00
Kconfig.debug powerpc: Implement CONFIG_STRICT_DEVMEM 2011-11-28 11:42:08 +11:00
Makefile powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00
relocs_check.pl powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00