This web page splits the content of a Linux Out Of Memory message into smaller pieces, aggregates these and presents them in a more human friendly format.
| Tigger process | ||
|---|---|---|
| (PID ) | This process requests memory and is triggering thereby the OOM situation | |
| Killed process | ||
| (PID ) | Process killed by Linux kernel to satisfy the memory request | |
| OOM Score (score) |
||
| Virtual Memory (total-vm) |
Virtual memory used by this process | |
| Resident anonymous memory (anon-rss) |
Part of the virtual process memory mapped into RAM | |
| Resident file mapping memory (file-rss) |
Files which have been mapped into RAM (with mmap(2)) | |
| Resident shared memory (shmem-rss) |
This may include System V shared memory and shared anonymous memory | |
| Memory Usage | ||
| RAM Summary | ||
| Swap Summary | ||
| RAM usage | ||
| Active anonymous memory | Recently used anonymous memory. These memory pages will usually not swapped out. |
|
| Inactive anonymous memory | Least recently used anonymous memory. These memory pages can be swapped out. |
|
| Isolated anonymous memory | Memory isolation is used to separate memory between different virtual machines. | |
| Active Pagecache | Pagecache that has been used more recently and usually not reclaimed unless absolutely necessary. | |
| Inactive Pagecache | Pagecache which has been less recently used. It can be reclaimed without huge performance impact. | |
| Isolated Pagecache | Memory isolation is used to separate memory between different virtual machines. | |
| Unevictable pages | Unevictable memory. It can't be swapped out because the pages are owned by ramfs or protected by mlock(3) / shmctl(SHM_LOCK). Unevictable pages are managed by kernels LRU framework. | |
| Dirty | Memory which is waiting to get written back to the disk. [1] | |
| Writeback | Memory which is actively being written back to the disk. [1] | |
| Unstable | Not yet committed to stable storage. | |
| Slab Reclaimable |
Slab is a in-kernel data structures cache. Part of Slab, that might be reclaimed, such as caches.
[1]
Additional details are listed in slabinfo(5) also. |
|
| Slab Unreclaimable | Part of Slab, that cannot be reclaimed on memory pressure. [1] | |
| Mapped | Files which have been mapped into memory (with mmap(2)), such as libraries. [1] | |
| shmem | Amount of memory consumed in tmpfs(5) filesystems. [1] | |
| Pagetables | Amount of memory dedicated to the lowest level of pagetables. [1] | |
| Bounce | Memory used for block device "bounce buffers". [1] | |
| free | ||
| free_pcp | ||
| free_cma | ||
| Total Pagecache | ||
| Swap usage | ||
| Swap Total | Total amount of swap space available. [1] | |
| Swap Free | Amount of swap space that is currently unused. [1] | |
| Swap Cached | Memory that once was swapped out, is swapped back in but still also is in the swap file. (If memory pres‐ sure is high, these pages don't need to be swapped out again because they are already in the swap file. This saves I/O). [1] | |
| Swap Used | Amount of used swap space w/o cached swap ( SwapUsed = SwapTotal - SwapFree -SwapCache)
|
|
| Operating System | ||
| Kernel | ||
| Distribution | Guessed from the kernel version | |
| Platform | Guessed from the kernel version | |
| Page size | Guessed | |
| Memory Chunks | ||
| Process Table | ||
| Hardware Details | ||
| Kernel Call Trace | ||
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