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| author | QingFeng Hao <haoqf@linux.vnet.ibm.com> | 2017-09-29 12:41:51 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-09 11:15:35 +0200 |
| commit | 9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681 (patch) | |
| tree | 9b530f5034bad26c87adf9b17919d01438e20e18 /arch/s390/kvm/kvm-s390.c | |
| parent | b7c92f1a4e131e459bcf53a570e7265e5ce64455 (diff) | |
| download | blackbird-op-linux-9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681.tar.gz blackbird-op-linux-9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681.zip | |
s390/sthyi: add cache to store hypervisor info
STHYI requires extensive locking in the higher hypervisors and is
very computational/memory expensive. Therefore we cache the retrieved
hypervisor info whose valid period is 1s with mutex to allow concurrent
access. rw semaphore can't benefit here due to cache line bounce.
Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 40d0a1a97889..de6a5b790da0 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1884,8 +1884,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) rc = -ENOMEM; - ratelimit_state_init(&kvm->arch.sthyi_limit, 5 * HZ, 500); - kvm->arch.use_esca = 0; /* start with basic SCA */ if (!sclp.has_64bscao) alloc_flags |= GFP_DMA; |
