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20d1c86a57
linux/arch/x86
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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
..
boot x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
configs x86, defconfig: Add DEVTMPFS and DEVTMPFS_MOUNT to *86*_defconfig 2013-11-04 20:01:55 -08:00
crypto crypto: sha256_ssse3 - also test for BMI2 2013-10-07 14:17:10 +08:00
ia32 constify copy_siginfo_to_user{,32}() 2013-11-09 00:16:29 -05:00
include sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs 2014-01-13 15:13:06 +01:00
kernel sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs 2014-01-13 15:13:06 +01:00
kvm KVM: nVMX: Unconditionally uninit the MMU on nested vmexit 2014-01-02 11:22:14 -02:00
lguest lguest: fix GPF in guest when using gdb. 2013-09-06 08:09:28 +09:30
lib ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
math-emu
mm mm: numa: serialise parallel get_user_page against THP migration 2013-12-18 19:04:50 -08:00
net net: x86: bpf: don't forget to free sk_filter (v2) 2013-11-07 19:06:52 -05:00
oprofile perf: Fix arch_perf_out_copy_user default 2013-11-06 12:34:25 +01:00
pci ACPI / driver core: Store an ACPI device pointer in struct acpi_dev_node 2013-11-14 23:14:43 +01:00
platform sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs 2014-01-13 15:13:06 +01:00
power x86, asmlinkage, power: Make various symbols used by the suspend asm code visible 2013-08-06 14:21:03 -07:00
realmode x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
syscalls sched: Add new scheduler syscalls to support an extended scheduling parameters ABI 2014-01-13 13:41:04 +01:00
tools Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 08:39:38 -07:00
um Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2013-11-19 11:42:32 -08:00
vdso seqcount: Add lockdep functionality to seqcount/seqlock structures 2013-11-06 12:40:26 +01:00
video
xen Features: 2013-11-15 13:34:37 +09:00
.gitignore
Kbuild
Kconfig math64: Add mul_u64_u32_shr() 2013-12-11 15:52:34 +01:00
Kconfig.cpu
Kconfig.debug x86/efi: Add EFI framebuffer earlyprintk support 2013-10-28 18:09:58 +00:00
Makefile x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
Makefile_32.cpu
Makefile.um