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https://github.com/tatref/linux-mem
Linux memory tools
https://github.com/tatref/linux-mem
linux memory
Last synced: about 2 months ago
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Linux memory tools
- Host: GitHub
- URL: https://github.com/tatref/linux-mem
- Owner: tatref
- Created: 2021-10-02T15:12:36.000Z (almost 3 years ago)
- Default Branch: master
- Last Pushed: 2024-02-27T00:38:14.000Z (7 months ago)
- Last Synced: 2024-02-28T00:44:48.285Z (7 months ago)
- Topics: linux, memory
- Language: Rust
- Homepage:
- Size: 1.1 MB
- Stars: 39
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Linux memory tools
A toolbox to inspect Linux memory
https://github.com/tatref/linux-mem
# Main tools
## [snap.py](proc_snap/README.md)
/proc snapshot tool
## [memstats](docs/memstats.md)
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 │
└─────────────────┴───────┴────────────┴────────────┴────────────┴───────────┴──────────┴──────────┴─────────────┴──────────┘
```
## [kpageflags](src/bin/kpageflags-viewer.rs)
Live visual map of physical memory with client/server modes
### Usage
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
```
### Building
Cross compiling to Windows (client only)
```
cargo install cross # requires podman/docker
cross b --release --target x86_64-pc-windows-gnu --bin kpageflags-viewer
```
## [processes2png](src/bin/processes2png.rs)
Visual map of processes memory
For details, see [my blog post](https://tatref.github.io/blog/2023-visual-linux-memory-compact/)
Effect of memory compaction:
# Small tools
## [procinfo](src/bin/procinfo.rs)
Memory map details for single process. List virtual memory, physical pages, physical flags...
Information is grabbed from `/proc//smaps`, `/proc//pagemap`, `/proc/kpageflags`
Usage: `procinfo `
```
# 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))
```
## [shmat](src/bin/shmat.rs)
Attach shared memory segments to current process
## [shmem](src/bin/shmem.rs)
Shared memory tool
## [connections](oracle-tools/src/bin/connections.rs)
Establish lots of connections to Oracle database
## [find_instances](oracle-tools/src/bin/find_instances.rs)
Find Oracle database instances, connect to DB and run some request. Env variables (SID, lib...) and user are found automatically.