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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2013-07-11 03:21:57 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-07-18 12:29:30 +0200 |
| commit | e04c5d76b0cfb66cadd900cf147526f2271884b8 (patch) | |
| tree | a303b66c1fc1ae7786148d2f50e8b0b86290162b /arch/x86/include/asm/pvclock.h | |
| parent | KVM: nVMX: Fix read/write to MSR_IA32_FEATURE_CONTROL (diff) | |
| download | linux-e04c5d76b0cfb66cadd900cf147526f2271884b8.tar.xz linux-e04c5d76b0cfb66cadd900cf147526f2271884b8.zip | |
remove sched notifier for cross-cpu migrations
Linux as a guest on KVM hypervisor, the only user of the pvclock
vsyscall interface, does not require notification on task migration
because:
1. cpu ID number maps 1:1 to per-CPU pvclock time info.
2. per-CPU pvclock time info is updated if the
underlying CPU changes.
3. that version is increased whenever underlying CPU
changes.
Which is sufficient to guarantee nanoseconds counter
is calculated properly.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/pvclock.h')
| -rw-r--r-- | arch/x86/include/asm/pvclock.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 109a9dd5d454..be8269b00e2a 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -93,7 +93,6 @@ unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, struct pvclock_vsyscall_time_info { struct pvclock_vcpu_time_info pvti; - u32 migrate_count; } __attribute__((__aligned__(SMP_CACHE_BYTES))); #define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) |