On Fri, Jun 02, 2017 at 10:18:57AM +0200, Michal Hocko wrote: > On Thu 01-06-17 12:56:35, Yu Zhao wrote: > > Saw need_resched() warnings when swapping on large swapfile (TBs) > > because page allocation in swap_cgroup_prepare() took too long. > > Hmm, but the page allocator makes sure to cond_resched for sleeping > allocations. I guess what you mean is something different. It is not the > allocation which took too look but there are too many of them and none > of them sleeps because there is enough memory and the allocator doesn't > sleep in that case. Right? > > > We already cond_resched when freeing page in swap_cgroup_swapoff(). > > Do the same for the page allocation. > > > > Signed-off-by: Yu Zhao <[email protected]> > > The patch itself makes sense to me, the changelog could see some > clarification but other than that > Acked-by: Michal Hocko <[email protected]>
Thanks, I'll clarify the problem in the commit message and resend the patch.
