Peter Zijlstra 20d1c86a57 sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs ... Use a ring-buffer like multi-version object structure which allows always having a coherent object; we use this to avoid having to disable IRQs while reading sched_clock() and avoids a problem when getting an NMI while changing the cyc2ns data. MAINLINE PRE POST sched_clock_stable: 1 1 1 (cold) sched_clock: 329841 331312 257223 (cold) local_clock: 301773 310296 309889 (warm) sched_clock: 38375 38247 25280 (warm) local_clock: 100371 102713 85268 (warm) rdtsc: 27340 27289 24247 sched_clock_stable: 0 0 0 (cold) sched_clock: 382634 372706 301224 (cold) local_clock: 396890 399275 399870 (warm) sched_clock: 38194 38124 25630 (warm) local_clock: 143452 148698 129629 (warm) rdtsc: 27345 27365 24307 Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/n/tip-s567in1e5ekq2nlyhn8f987r@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>		2014-01-13 15:13:06 +01:00
..
bios_uv.c	x86: Fix files explicitly requiring export.h for EXPORT_SYMBOL/THIS_MODULE	2011-10-31 19:30:35 -04:00
Makefile	x86/UV: Move NMI support	2013-09-24 09:02:02 +02:00
tlb_uv.c	sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs	2014-01-13 15:13:06 +01:00
uv_irq.c	Merge branch 'x86/cleanups' into x86/apic	2012-06-15 14:17:01 +02:00
uv_nmi.c	x86/dumpstack: Fix printk_address for direct addresses	2013-11-12 21:06:06 +01:00
uv_sysfs.c	driver-core: remove sysdev.h usage.	2011-12-21 16:26:03 -08:00
uv_time.c	x86/platform/uv: Replace kmalloc() & memset with kzalloc()	2013-03-11 08:33:01 +01:00