rlimit

代码 kernel/sys.c

具体的使用: https://www.ibm.com/docs/pl/aix/7.2?topic=u-ulimit-command

include/uapi/asm-generic/resource.h

2.5 Process Resource Limits

The rlim_max field is the maximum allowed value for the resource limit. By using the getrlimit() and setrlimit() system calls, a user can always increase the rlim_cur limit of some resource up to rlim_max. However, only the superuser (or, more precisely, a user who has the CAP_SYS_RESOURCE capability) can increase the rlim_max field or set the rlim_cur field to a value greater than the corresponding rlim_max field.

@todo

既然存在 cgroup, 为什么这个东西不是被 disable 掉的 ?

Whenever a user logs into the system, the kernel creates a process owned by the superuser, which can invoke setrlimit() to decrease the rlim_max and rlim_cur fields for a resource. The same process later executes a login shell and becomes owned by the user. Each new process created by the user inherits the content of the rlim array from its parent, and therefore the user cannot override the limits enforced by the administrator.

@todo 这个描述的过程也太棒了吧! 可以找到代码上的证据吗 ?

Linux provides the resource limit (rlimit) mechanism to impose certain system resource usage limits on processes. The mechanism makes use of the rlim array in task_struct, whose elements are of the struct rlimit type.

如何配置文件的大小

 cat /proc/self/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        unlimited            unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             unlimited            unlimited            processes
Max open files            1024                 524288               files
Max locked memory         8388608              8388608              bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       513462               513462               signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

 ulimit  -S  -n 10000
bash-5.1# cat /proc/self/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        unlimited            unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             unlimited            unlimited            processes
Max open files            10000                524288               files
Max locked memory         8388608              8388608              bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       513462               513462               signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

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