forked from Minki/linux
80e9a4f21f
The default sched_clock() implementation is native_sched_clock(). It contains code to handle non constant frequency TSCs, which creates overhead for systems with constant frequency TSCs. The vmware hypervisor guarantees a constant frequency TSC, so native_sched_clock() is not required and slower than a dedicated function which operates with one time calculated conversion factors. Calculate the conversion factors at boot time from the tsc frequency and install an optimized sched_clock() function via paravirt ops. The paravirtualized clock can be disabled on the kernel command line with the new 'no-vmw-sched-clock' option. Signed-off-by: Alexey Makhalov <amakhalov@vmware.com> Acked-by: Alok N Kataria <akataria@vmware.com> Cc: linux-doc@vger.kernel.org Cc: pv-drivers@vmware.com Cc: corbet@lwn.net Cc: virtualization@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20161028075432.90579-4-amakhalov@vmware.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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| .. | ||
| mcheck | ||
| microcode | ||
| mtrr | ||
| .gitignore | ||
| amd.c | ||
| bugs_64.c | ||
| bugs.c | ||
| centaur.c | ||
| common.c | ||
| cpu.h | ||
| cyrix.c | ||
| hypervisor.c | ||
| intel_cacheinfo.c | ||
| intel.c | ||
| Makefile | ||
| match.c | ||
| mkcapflags.sh | ||
| mshyperv.c | ||
| perfctr-watchdog.c | ||
| powerflags.c | ||
| proc.c | ||
| rdrand.c | ||
| scattered.c | ||
| topology.c | ||
| transmeta.c | ||
| umc.c | ||
| vmware.c | ||