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Subject[PATCH] mm: limit a process RSS
Date
we cannot limit a process RSS although there is ulimit -m,
not sure why and when ulimit -m is not working, make it work

similar requirement:
https://stackoverflow.com/questions/3360348/why-ulimit-cant-limit-resident-memory-successfully-and-how

Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
mm/memory.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/mm/memory.c b/mm/memory.c
index 5fcfc24904d1..50cf9399477c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4140,6 +4140,9 @@ int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
ret = __handle_mm_fault(vma, address, flags);

if (flags & FAULT_FLAG_USER) {
+ unsigned long total_rss = get_mm_rss(current->mm);
+ u64 rlimit;
+
mem_cgroup_oom_disable();
/*
* The task may have entered a memcg OOM situation but
@@ -4149,6 +4152,17 @@ int handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
*/
if (task_in_memcg_oom(current) && !(ret & VM_FAULT_OOM))
mem_cgroup_oom_synchronize(false);
+
+ rlimit = current->signal->rlim[RLIMIT_RSS].rlim_cur;
+
+ if (unlikely(total_rss > (rlimit >> PAGE_SHIFT)) &&
+ (current->pid != 1)) {
+
+ pr_info("kill process %s rsslimit[%lluK] rss[%luK]\n",
+ current->comm, (rlimit >> 10),
+ total_rss << (PAGE_SHIFT - 10));
+ do_group_exit(SIGKILL);
+ }
}

return ret;
--
2.11.0
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