Hi, I find the active file + inactive file is larger than cached + buffers, about 5G, and can not free it by "echo 3 > /proc/sys/vm/drop_caches"
The meminfo shows that the mapped is also very small, so maybe some get the page? (e.g. get_user_pages()) Then it will dec the count of NR_FILE_PAGES when delete from page cache, but because of the count, the page can not delete from lru, so left active file + inactive file so large, right? MemTotal: 61528660 kB MemFree: 48678936 kB MemAvailable: 53657348 kB Buffers: 10832 kB Cached: 640340 kB SwapCached: 0 kB Active: 5933664 kB Inactive: 588968 kB Active(anon): 1022200 kB Inactive(anon): 533248 kB Active(file): 4911464 kB Inactive(file): 55720 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 10952 kB Writeback: 0 kB AnonPages: 980572 kB Mapped: 85464 kB Shmem: 581580 kB Slab: 343480 kB SReclaimable: 264632 kB SUnreclaim: 78848 kB KernelStack: 8368 kB PageTables: 18012 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 28667176 kB Committed_AS: 4144064 kB VmallocTotal: 34359738367 kB VmallocUsed: 265848 kB VmallocChunk: 34359417096 kB HardwareCorrupted: 0 kB AnonHugePages: 688128 kB HugePages_Total: 4 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 1048576 kB DirectMap4k: 182112 kB DirectMap2M: 11294720 kB DirectMap1G: 51380224 kB
