我发现 meminfo 没有显示由页面分配器 (fn:allocate_pages) 直接分配的内存使用情况
file:///proc/meminfo
MemTotal: 2039496 kB
MemFree: 108684 kB
MemAvailable: 79108 kB
Buffers: 104 kB
Cached: 375520 kB
SwapCached: 0 kB
Active: 403632 kB
Inactive: 30588 kB
Active(anon): 403548 kB
Inactive(anon): 30544 kB
Active(file): 84 kB
Inactive(file): 44 kB
Unevictable: 218488 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 277080 kB
Mapped: 132144 kB
Shmem: 157012 kB
Slab: 55540 kB
SReclaimable: 8276 kB
SUnreclaim: 47264 kB
KernelStack: 2848 kB
PageTables: 23364 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1019748 kB
Committed_AS: 17172160 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
Percpu: 304 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
DirectMap4k: 34644 kB
DirectMap2M: 2062336 kB
DirectMap1G: 0 kB
有什么方法可以知道页面分配内存的大小？