Will Deacon 5727347180 ARM: 7354/1: perf: limit sample_period to half max_period in non-sampling mode ... On ARM, the PMU does not stop counting after an overflow and therefore IRQ latency affects the new counter value read by the kernel. This is significant for non-sampling runs where it is possible for the new value to overtake the previous one, causing the delta to be out by up to max_period events. Commit a737823d ("ARM: 6835/1: perf: ensure overflows aren't missed due to IRQ latency") attempted to fix this problem by allowing interrupt handlers to pass an overflow flag to the event update function, causing the overflow calculation to assume that the counter passed through zero when going from prev to new. Unfortunately, this doesn't work when overflow occurs on the perf_task_tick path because we have the flag cleared and end up computing a large negative delta. This patch removes the overflow flag from armpmu_event_update and instead limits the sample_period to half of the max_period for non-sampling profiling runs. Cc: <stable@vger.kernel.org> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		2012-03-07 09:40:48 +00:00
..
hardware	ARM: 7164/3: PL330: Fix the size of the dst_cache_ctrl field	2012-02-15 21:10:49 +00:00
mach	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci	2012-01-11 18:50:26 -08:00
a.out-core.h
a.out.h
asm-offsets.h
assembler.h	ARM: 7325/1: fix v7 boot with lockdep enabled	2012-02-15 21:09:52 +00:00
atomic.h
bitops.h
bug.h	ARM: 7267/1: Remove BUILD_BUG_ON from asm/bug.h	2012-01-05 13:23:22 +00:00
bugs.h
byteorder.h
cache.h
cacheflush.h
cachetype.h
checksum.h
clkdev.h
cpu.h
cputype.h
cti.h
current.h
delay.h
device.h
div64.h
dma-mapping.h
dma.h
domain.h	ARM: 7301/1: Rename the T() macro to TUSER() to avoid namespace conflicts	2012-01-25 11:07:40 +00:00
ecard.h
edac.h	ARM: 7201/1: add EDAC atomic_scrub function	2011-12-11 08:35:50 +00:00
elf.h
entry-macro-multi.S
exception.h
fb.h
fcntl.h
fiq.h
fixmap.h
flat.h
floppy.h
fncpy.h
fpstate.h
ftrace.h
futex.h	ARM: 7301/1: Rename the T() macro to TUSER() to avoid namespace conflicts	2012-01-25 11:07:40 +00:00
glue-cache.h
glue-df.h
glue-pf.h
glue-proc.h
glue.h
gpio.h	ARM: 7271/1: Fix typo in conversion of ARCH_NR_GPIOS to Kconfig	2012-01-08 09:27:19 +00:00
hardirq.h
highmem.h
hw_breakpoint.h
hw_irq.h
hwcap.h	UAPI: Split trivial #if defined(__KERNEL__) && X conditionals	2011-12-13 15:07:49 +00:00
ide.h
idmap.h	ARM: SMP: use idmap_pgd for mapping MMU enable during secondary booting	2011-12-06 14:04:15 +00:00
io.h
ioctls.h
ipcbuf.h	consolidate a bunch of ipcbuf.h instances	2012-01-03 22:55:18 -05:00
irq.h
irqflags.h
Kbuild
kexec.h
kgdb.h
kmap_types.h
kprobes.h	Kernel: Audit Support For The ARM Platform	2012-01-17 16:17:01 -05:00
leds.h
limits.h
linkage.h
localtimer.h
locks.h
mach-types.h
mc146818rtc.h
memblock.h	ARM: Add arm_memblock_steal() to allocate memory away from the kernel	2012-01-13 15:02:35 +00:00
memory.h
mman.h
mmu_context.h
mmu.h
module.h
msgbuf.h
mtd-xip.h
mutex.h
nwflash.h
opcodes.h	ARM: 7206/1: Add generic ARM instruction set condition code checks.	2011-12-13 08:52:02 +00:00
outercache.h
page-nommu.h
page.h	ARM: LPAE: Introduce the 3-level page table format definitions	2011-12-08 10:30:39 +00:00
param.h
parport.h
pci.h	PCI: ARM: convert pcibios_set_master() to a non-inlined function	2012-01-06 12:10:36 -08:00
perf_event.h
pgalloc.h	ARM: LPAE: Page table maintenance for the 3-level format	2011-12-08 10:30:39 +00:00
pgtable-2level-hwdef.h
pgtable-2level-types.h
pgtable-2level.h	ARM: LPAE: Move page table maintenance macros to pgtable-2level.h	2011-12-08 10:30:37 +00:00
pgtable-3level-hwdef.h	ARM: LPAE: Introduce the 3-level page table format definitions	2011-12-08 10:30:39 +00:00
pgtable-3level-types.h	ARM: LPAE: Introduce the 3-level page table format definitions	2011-12-08 10:30:39 +00:00
pgtable-3level.h	ARM: LPAE: Page table maintenance for the 3-level format	2011-12-08 10:30:39 +00:00
pgtable-hwdef.h	ARM: LPAE: Introduce the 3-level page table format definitions	2011-12-08 10:30:39 +00:00
pgtable-nommu.h
pgtable.h	Merge branch 'devel-stable' into for-linus	2012-01-05 13:24:33 +00:00
pmu.h	ARM: 7354/1: perf: limit sample_period to half max_period in non-sampling mode	2012-03-07 09:40:48 +00:00
posix_types.h
proc-fns.h	ARM: LPAE: Page table maintenance for the 3-level format	2011-12-08 10:30:39 +00:00
processor.h	ARM: 7327/1: need to include asm/system.h in asm/processor.h	2012-02-15 21:10:49 +00:00
procinfo.h
prom.h	ARM: prom.h: Fix build error by removing unneeded header file	2012-01-04 23:47:52 -07:00
ptrace.h	Kernel: Audit Support For The ARM Platform	2012-01-17 16:17:01 -05:00
scatterlist.h
sched_clock.h	ARM: 7205/2: sched_clock: allow sched_clock to be selected at runtime	2011-12-18 23:00:26 +00:00
seccomp.h
segment.h
sembuf.h
serial.h
setup.h	ARM: Allow Kconfig to control the definition of NR_BANKS	2011-12-13 08:52:02 +00:00
shmbuf.h
shmparam.h
sigcontext.h
signal.h
smp_plat.h	ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP	2012-01-23 10:20:05 +00:00
smp_scu.h
smp_twd.h
smp.h	ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP	2012-01-23 10:20:05 +00:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h
spinlock.h
stackprotector.h
stacktrace.h
stat.h
statfs.h
string.h
suspend.h
swab.h	Merge branch 'for-next' of git://git.infradead.org/users/dhowells/linux-headers	2012-01-14 18:03:30 -08:00
system.h	Merge branch 'restart' into for-linus	2012-01-05 13:25:27 +00:00
tcm.h
termbits.h
termios.h
therm.h
thread_info.h	Kernel: Audit Support For The ARM Platform	2012-01-17 16:17:01 -05:00
thread_notify.h
timex.h
tlb.h	ARM: 7302/1: Add TLB flushing for both entries in a PMD	2012-02-02 17:37:42 +00:00
tlbflush.h
tls.h
topology.h
traps.h
types.h	consolidate umode_t declarations	2012-01-03 22:55:17 -05:00
uaccess.h	ARM: 7301/1: Rename the T() macro to TUSER() to avoid namespace conflicts	2012-01-25 11:07:40 +00:00
ucontext.h
unaligned.h
unified.h	ARM: make BSYM macro assembly only	2012-01-16 08:56:25 -06:00
unistd.h	UAPI: Split trivial #if defined(__KERNEL__) && X conditionals	2011-12-13 15:07:49 +00:00
unwind.h	ARM: 7187/1: fix unwinding for XIP kernels	2011-12-06 11:16:13 +00:00
user.h
vfp.h
vfpmacros.h
vga.h
xor.h