[Linux-cachefs] [PATCH v13 1/4] mm: Add become_kswapd and restore_kswapd

[Matthew Wilcox]

On Thu, Dec 17, 2020 at 02:06:09PM +1100, Dave Chinner wrote:
> On Thu, Dec 17, 2020 at 09:11:54AM +0800, Yafang Shao wrote:
> > From: "Matthew Wilcox (Oracle)" <willy at infradead.org>
> > 
> > Since XFS needs to pretend to be kswapd in some of its worker threads,
> > create methods to save & restore kswapd state.  Don't bother restoring
> > kswapd state in kswapd -- the only time we reach this code is when we're
> > exiting and the task_struct is about to be destroyed anyway.
...
> > @@ -3932,8 +3920,6 @@ static int kswapd(void *p)
> >  			goto kswapd_try_sleep;
> >  	}
> >  
> > -	tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
> > -
> 
> Missing a restore_kswapd()?

Deliberately.