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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/kernel/entry.h | |
| parent | b7c92f1a4e131e459bcf53a570e7265e5ce64455 (diff) | |
| download | linux-stable-9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681.tar.gz linux-stable-9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681.tar.bz2 linux-stable-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/kernel/entry.h')
0 files changed, 0 insertions, 0 deletions