Understanding the Linux® Virtual Memory Manager

Appendix M. Out of Memory Management

Contents

M.1 Determining Available Memory	698
M.1.1 Function: vm_enough_memory()	698
M.2 Detecting and Recovering From OOM	700
M.2.1 Function: out_of_memory()	700
M.2.2 Function: oom_kill()	701
M.2.3 Function: select_bad_process()	702
M.2.4 Function: badness()	703
M.2.5 Function: oom_kill_task()	704

Determining Available Memory

Contents

M.1 Determining Available Memory	698
M.1.1 Function: vm_enough_memory()	698

Function: vm_enough_memory() (mm/mmap.c)

 53 int vm_enough_memory(long pages) 54 { 65 unsigned long free; 66 67 /* Sometimes we want to use more memory than we have. */ 68 if (sysctl_overcommit_memory) 69 return 1; 70 71 /* The page cache contains buffer pages these days.. */ 72 free = atomic_read(&page_cache_size); 73 free ...