A toolbox to inspect Linux memory
https://github.com/tatref/linux-mem
/proc snapshot tool
Memory usage for groups of processes. Main target is Oracle databases
┌─────────────────┬───────┬────────────┬────────────┬────────────┬───────────┬──────────┬──────────┬─────────────┬──────────┐
│ group_name │ procs │ mem_rss │ mem_anon │ mem_uss │ swap_anon │ swap_rss │ swap_uss │ shm_mem │ shm_swap │
├─────────────────┼───────┼────────────┼────────────┼────────────┼───────────┼──────────┼──────────┼─────────────┼──────────┤
│ Some("+ASM1") │ 102 │ 5209.41 MB │ 4636.65 MB │ 5179.87 MB │ 0 MB │ 0 MB │ 0 MB │ 3213.41 MB │ 0 MB │
│ None │ 74 │ 3790.02 MB │ 3536.86 MB │ 3765.41 MB │ 0.01 MB │ 0.01 MB │ 0.01 MB │ 0 MB │ 0 MB │
│ Some("DBB1") │ 109 │ 2357.09 MB │ 1489.36 MB │ 2216.93 MB │ 0 MB │ 0 MB │ 0 MB │ 21479.03 MB │ 0 MB │
│ Some("DBD1") │ 90 │ 1614.49 MB │ 1101.75 MB │ 1470.30 MB │ 0 MB │ 0 MB │ 0 MB │ 4299.16 MB │ 0 MB │
└─────────────────┴───────┴────────────┴────────────┴────────────┴───────────┴──────────┴──────────┴─────────────┴──────────┘
Live visual map of physical memory with client/server modes
Local usage
sudo ./target/release/kpageflags-viewer
Server usage
sudo ./target/release/kpageflags-viewer server 192.168.0.1:10000
Client usage
./target/release/kpageflags-viewer client 192.168.0.1:10000
Cross compiling to Windows (client only)
cargo install cross # requires podman/docker
cross b --release --target x86_64-pc-windows-gnu --bin kpageflags-viewer
Visual map of processes memory
For details, see my blog post
Effect of memory compaction:
Memory map details for single process. List virtual memory, physical pages, physical flags...
Information is grabbed from /proc/<pid>/smaps, /proc/<pid>/pagemap, /proc/kpageflags
Usage: procinfo <pid...>
# procinfo 12345
0x00007ff437847000-0x00007ff437849000 MMPermissions(NONE | READ | WRITE | PRIVATE) 0 Anonymous
PFN=0x0000159f83 MemoryPageFlags(SOFT_DIRTY | PRESENT | 0x159f83) / Some(PhysicalPageFlags(UPTODATE | LRU | MMAP | ANON | SWAPBACKED))
PFN=0x000010a5cb MemoryPageFlags(SOFT_DIRTY | PRESENT | 0x10a5cb) / Some(PhysicalPageFlags(UPTODATE | LRU | MMAP | ANON | SWAPBACKED))
stats: VSZ=8 kiB, RSS=8 kiB, SWAP=0 kiB
0x00007ff43784d000-0x00007ff437854000 MMPermissions(NONE | READ | SHARED) 160259 Path("/usr/lib64/gconv/gconv-modules.cache")
PFN=0x0000109d63 MemoryPageFlags(SOFT_DIRTY | FILE | PRESENT | 0x109d63) / Some(PhysicalPageFlags(REFERENCED | UPTODATE | LRU | ACTIVE | MMAP))
PFN=0x0000109d5b MemoryPageFlags(SOFT_DIRTY | FILE | PRESENT | 0x109d5b) / Some(PhysicalPageFlags(REFERENCED | UPTODATE | LRU | ACTIVE | MMAP))
Attach shared memory segments to current process
Shared memory tool
Establish lots of connections to Oracle database
Find Oracle database instances, connect to DB and run some request. Env variables (SID, lib...) and user are found automatically.