linux-kernel - Re: [RFC 2/7] mm: change PAGEREF_RECLAIM_CLEAN with PAGE

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Date:   Mon, 20 May 2019 12:50:13 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Michal Hocko <mhocko@...e.com>,
        Tim Murray <timmurray@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Daniel Colascione <dancol@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Brian Geffon <bgeffon@...gle.com>
Subject: Re: [RFC 2/7] mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM

On Mon, May 20, 2019 at 12:52:49PM +0900, Minchan Kim wrote:
> The local variable references in shrink_page_list is PAGEREF_RECLAIM_CLEAN
> as default. It is for preventing to reclaim dirty pages when CMA try to
> migrate pages. Strictly speaking, we don't need it because CMA didn't allow
> to write out by .may_writepage = 0 in reclaim_clean_pages_from_list.
>
> Moreover, it has a problem to prevent anonymous pages's swap out even
> though force_reclaim = true in shrink_page_list on upcoming patch.
> So this patch makes references's default value to PAGEREF_RECLAIM and
> rename force_reclaim with skip_reference_check to make it more clear.
> 
> This is a preparatory work for next patch.
> 
> Signed-off-by: Minchan Kim <minchan@...nel.org>

Looks good to me, just one nit below.

Acked-by: Johannes Weiner <hannes@...xchg.org>

> ---
>  mm/vmscan.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index d9c3e873eca6..a28e5d17b495 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1102,7 +1102,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>  				      struct scan_control *sc,
>  				      enum ttu_flags ttu_flags,
>  				      struct reclaim_stat *stat,
> -				      bool force_reclaim)
> +				      bool skip_reference_check)

"ignore_references" would be better IMO