Re: [PATCH 09/14] resource limits: track highwater mark of locked memory
From: Oleg Nesterov <oleg@redhat.com>
Date: 2016-07-15 15:14:00
Also in:
kvm, linux-mm, linux-rdma, netdev
On 07/15, Topi Miettinen wrote:
Track maximum size of locked memory, to be able to configure RLIMIT_MEMLOCK resource limits. The information is available with taskstats and cgroupstats netlink socket.
So I personally still dislike the very idea of this series... but I won't argue if you convince maintainers.
quoted hunk ↗ jump to hunk
@@ -2020,6 +2020,10 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns return -ENOMEM; update_resource_highwatermark(RLIMIT_STACK, actual_size); + if (vma->vm_flags & VM_LOCKED) + update_resource_highwatermark(RLIMIT_MEMLOCK, + (mm->locked_vm + grow) << + PAGE_SHIFT);
Btw this is not right. The same for the previous patch which tracks RLIMIT_STACK. The "current" task can debugger/etc. Yes, yes, this just reminds that the whole rlimit logic in this path is broken but still... Oleg.