Re: [patch v2] mm, memcg: do not retry precharge charges

[Johannes Weiner]

On Fri, Jan 13, 2017 at 02:09:53AM -0800, David Rientjes wrote:
> When memory.move_charge_at_immigrate is enabled and precharges are
> depleted during move, mem_cgroup_move_charge_pte_range() will attempt to
> increase the size of the precharge.
> 
> Prevent precharges from ever looping by setting __GFP_NORETRY.  This was
> probably the intention of the GFP_KERNEL & ~__GFP_NORETRY, which is
> pointless as written.

The OOM killer livelock was the motivation for this patch. With that
ruled out, what's the point of this patch? Try a bit less hard to move
charges during task migration?