Re: [PATCH] mm: disable `vm.max_map_count' sysctl limit
From: Andi Kleen <hidden>
Date: 2017-11-27 20:21:21
Also in:
linux-fsdevel, linux-mm, lkml
On Mon, Nov 27, 2017 at 08:57:32PM +0100, Michal Hocko wrote:
On Mon 27-11-17 19:32:18, Michal Hocko wrote:quoted
On Mon 27-11-17 09:25:16, Andi Kleen wrote:[...]quoted
quoted
The reason the limit was there originally because it allows a DoS attack against the kernel by filling all unswappable memory up with VMAs.We can reduce the effect by accounting vmas to memory cgroups.As it turned out we already do. vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT);
That only helps if you have memory cgroups enabled. It would be a regression to break the accounting on all the systems that don't. -Andi