qemu-kvm 使用内存的大页

来自EPT VPID <<kvm虚拟化技术与原理解析>>
挂载大页

mount -t hugetlbfs hugetlbfs /dev/hugepages/

设置大页数目

sysctl vm.nr_hugepages=1024

查看大页
主要
看HugePages_Total这四行，挂载设置前后有区别

cat /proc/meminfo

启动qemu虚拟机使用大页
-mem-path /dev/hugepages -mem-prealloc

/usr/libexec/qemu-kvm -m 1024 -smp 2  -hda /root/kvm/rhel65.img  -vnc 192.168.137.188:1 -mem-path /dev/hugepages -mem-prealloc -daemonize

vm使用大页后看到的host的上的效果

[root@haoning hugepages]# cat /proc/meminfo 
MemTotal:        3908796 kB
MemFree:          116376 kB
Buffers:           99316 kB
Cached:           321756 kB
SwapCached:         8020 kB
Active:           789280 kB
Inactive:         669260 kB
Active(anon):     603672 kB
Inactive(anon):   444276 kB
Active(file):     185608 kB
Inactive(file):   224984 kB
Unevictable:        8440 kB
Mlocked:            8440 kB
SwapTotal:       2031608 kB
SwapFree:        2015532 kB
Dirty:                16 kB
Writeback:             0 kB
AnonPages:       1041816 kB
Mapped:            60468 kB
Shmem:              3048 kB
Slab:             109192 kB
SReclaimable:      64856 kB
SUnreclaim:        44336 kB
KernelStack:        3088 kB
PageTables:        45372 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2937428 kB
Committed_AS:    2437948 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      167764 kB
VmallocChunk:   34359516772 kB
HardwareCorrupted:     0 kB
AnonHugePages:    354304 kB
HugePages_Total:    1024
HugePages_Free:      838
HugePages_Rsvd:      334
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        8192 kB
DirectMap2M:     2088960 kB
DirectMap1G:     2097152 kB
[root@haoning hugepages]#