linux-kernel - Re: [PATCH linux-next v2] swap_state: update shadow

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Date:   Fri, 13 Jan 2023 13:59:33 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     yang.yang29@....com.cn, akpm@...ux-foundation.org,
        hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, ran.xiaokai@....com.cn
Subject: Re: [PATCH linux-next v2] swap_state: update shadow_nodes for
 anonymous page

On Fri, Jan 13, 2023 at 03:47:31PM +0700, Bagas Sanjaya wrote:
> On Fri, Jan 13, 2023 at 03:50:45PM +0800, yang.yang29@....com.cn wrote:
> > This patch updates shadow_nodes of anonymous page when swap
> > cache is add or delete.
> 
> By what?

This is not a helpful question.

> > @@ -252,6 +256,8 @@ void clear_shadow_from_swap_cache(int type, unsigned long begin,
> >  		struct address_space *address_space = swap_address_space(entry);
> >  		XA_STATE(xas, &address_space->i_pages, curr);
> > 
> > +		xas_set_update(&xas, workingset_update_node);
> > +
> >  		xa_lock_irq(&address_space->i_pages);
> >  		xas_for_each(&xas, old, end) {
> >  			if (!xa_is_value(old))
> 
> Adding xas_set_update() call?

It makes perfect sense to me.

> In any case, please explain what you are doing above in imperative mood
> (no "This patch does foo" but "Do foo" instead).

Not helpful either.