linux-kernel - Re: [PATCH] mm: Fix recent

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Message-ID: <20190529140102.xfxeiv3fvcw555tv@ca-dmjordan1.us.oracle.com>
Date:   Wed, 29 May 2019 10:01:02 -0400
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     akpm@...ux-foundation.org, daniel.m.jordan@...cle.com,
        mhocko@...e.com, hannes@...xchg.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Fix recent_rotated history

On Wed, May 29, 2019 at 11:30:09AM +0300, Kirill Tkhai wrote:
> Missed Johannes :(
> 
> CC
> 
> On 28.05.2019 19:09, Kirill Tkhai wrote:
> > Johannes pointed that after commit 886cf1901db9
> > we lost all zone_reclaim_stat::recent_rotated
> > history. This commit fixes that.

Ugh, good catch.

I took another pass through this series but didn't notice anything else.

> > 
> > Fixes: 886cf1901db9 "mm: move recent_rotated pages calculation to shrink_inactive_list()"
> > Reported-by: Johannes Weiner <hannes@...xchg.org>
> > Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> > ---
> >  mm/vmscan.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index d9c3e873eca6..1d49329a4d7d 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -1953,8 +1953,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
> >  	if (global_reclaim(sc))
> >  		__count_vm_events(item, nr_reclaimed);
> >  	__count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
> > -	reclaim_stat->recent_rotated[0] = stat.nr_activate[0];
> > -	reclaim_stat->recent_rotated[1] = stat.nr_activate[1];
> > +	reclaim_stat->recent_rotated[0] += stat.nr_activate[0];
> > +	reclaim_stat->recent_rotated[1] += stat.nr_activate[1];
> >  
> >  	move_pages_to_lru(lruvec, &page_list);
> >  
> > 
>