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88c9281a9f
linux/arch/x86/kernel/cpu
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Vitaly Kuznetsov 88c9281a9f x86/hyperv: Mark the Hyper-V TSC as unstable 
The Hyper-V top-level functional specification states, that
"algorithms should be resilient to sudden jumps forward or
backward in the TSC value", this means that we should consider
TSC as unstable. In some cases tsc tests are able to detect the
instability, it was detected in 543 out of 646 boots in my
testing:

 Measured 6277 cycles TSC warp between CPUs, turning off TSC clock.
 tsc: Marking TSC unstable due to check_tsc_sync_source failed

This is, however, just a heuristic. On Hyper-V platform there
are two good clocksources: MSR-based hyperv_clocksource and
recently introduced TSC page.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Link: http://lkml.kernel.org/r/1440003264-9949-1-git-send-email-vkuznets@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-08-21 08:44:38 +02:00
..
mcheck Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
microcode x86/microcode: Correct CPU family related variable types 2015-06-07 15:38:15 +02:00
mtrr x86/mm/pat: Wrap pat_enabled into a function API 2015-05-27 14:41:01 +02:00
.gitignore
amd.c Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
bugs_64.c
bugs.c x86/fpu: Move various internal function prototypes to fpu/internal.h 2015-05-19 15:47:48 +02:00
centaur.c x86: Remove CONFIG_X86_OOSTORE 2014-03-11 10:16:18 -07:00
common.c x86/fpu: Fix FPU related boot regression when CPUID masking BIOS feature is enabled 2015-06-30 07:22:10 +02:00
cpu.h x86/cpu: Track legacy CPU model data only on 32-bit kernels 2013-10-26 13:34:39 +02:00
cyrix.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
hypervisor.c hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests 2015-05-05 18:27:43 +01:00
intel_cacheinfo.c x86: Kill CONFIG_X86_HT 2015-06-07 15:33:44 +02:00
intel_pt.h perf/x86/intel/pt: Add Intel PT PMU driver 2015-04-02 17:14:20 +02:00
intel.c x86/cpu/intel: Fix trivial typo in intel_tlb_table[] 2015-02-22 08:55:58 +01:00
Makefile perf/x86/intel/bts: Add BTS PMU driver 2015-04-02 17:14:21 +02:00
match.c x86: align x86 arch with generic CPU modalias handling 2014-02-18 12:45:38 -08:00
mkcapflags.sh x86/build: Fix mkcapflags.sh bash-ism 2015-02-19 02:21:00 +01:00
mshyperv.c x86/hyperv: Mark the Hyper-V TSC as unstable 2015-08-21 08:44:38 +02:00
perf_event_amd_ibs.c perf/x86/amd/ibs: Convert force_ibs_eilvt_setup() to void 2015-02-18 17:01:46 +01:00
perf_event_amd_iommu.c cpumask: factor out show_cpumap into separate helper function 2014-11-07 11:45:00 -08:00
perf_event_amd_iommu.h
perf_event_amd_uncore.c cpumask: factor out show_cpumap into separate helper function 2014-11-07 11:45:00 -08:00
perf_event_amd.c perf/x86: Add 'index' param to get_event_constraint() callback 2015-04-02 17:33:10 +02:00
perf_event_intel_bts.c Replace module_init with appropriate alternate initcall in non modules. 2015-07-02 10:36:29 -07:00
perf_event_intel_cqm.c perf/x86/intel/cqm: Use 'u32' data type for RMIDs 2015-05-27 09:17:41 +02:00
perf_event_intel_ds.c perf/x86/intel/pebs: Add PEBSv3 decoding 2015-06-07 16:09:16 +02:00
perf_event_intel_lbr.c perf/x86/intel: Drain the PEBS buffer during context switches 2015-06-07 16:08:54 +02:00
perf_event_intel_pt.c Replace module_init with appropriate alternate initcall in non modules. 2015-07-02 10:36:29 -07:00
perf_event_intel_rapl.c Merge branch 'linus' into timers/core 2015-05-19 16:12:32 +02:00
perf_event_intel_uncore_nhmex.c perf/x86/uncore: Fix coccinelle warnings 2014-08-13 07:51:09 +02:00
perf_event_intel_uncore_snb.c perf/x86/intel/uncore: Add Broadwell-U uncore IMC PMU support 2015-05-11 11:57:47 +02:00
perf_event_intel_uncore_snbep.c perf/x86/intel/uncore: Fix CBOX bit wide and UBOX reg on Haswell-EP 2015-06-07 15:46:50 +02:00
perf_event_intel_uncore.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 18:57:44 -07:00
perf_event_intel_uncore.h Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 15:19:21 -07:00
perf_event_intel.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 15:52:04 -07:00
perf_event_knc.c x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
perf_event_p4.c x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
perf_event_p6.c perf/x86/intel/p6: Add userspace RDPMC quirk for PPro 2014-02-09 13:08:24 +01:00
perf_event.c perf/x86: Fix 'active_events' imbalance 2015-06-30 13:08:46 +02:00
perf_event.h Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 15:45:41 -07:00
perfctr-watchdog.c
powerflags.c
proc.c x86: Replace cpu_**_mask() with topology_**_cpumask() 2015-05-27 15:22:17 +02:00
rdrand.c x86, rdrand: When nordrand is specified, disable RDSEED as well 2014-05-11 20:25:20 -07:00
scattered.c x86: Add Intel Processor Trace (INTEL_PT) cpu feature detection 2015-04-02 17:14:18 +02:00
topology.c x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
transmeta.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
umc.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
vmware.c x86: Correctly detect hypervisor 2013-08-05 06:35:33 -07:00