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From: Yang Shi <shy828301@gmail.com>
To: "Xiaqing (A)" <saberlily.xia@hisilicon.com>
Cc: Roman Gushchin <guro@fb.com>, Kirill Tkhai <ktkhai@virtuozzo.com>,
	Shakeel Butt <shakeelb@google.com>,
	Dave Chinner <david@fromorbit.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux MM <linux-mm@kvack.org>,
	Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Liu Yi <daniel.liuyi@hisilicon.com>
Subject: Re: [PATCH 2/9] mm: vmscan: use nid from shrink_control for tracepoint
Date: Fri, 11 Dec 2020 11:20:19 -0800	[thread overview]
Message-ID: <CAHbLzkr16gAYRpLceusLRtJQxx50Wxq1f3fUoGaYHC5-6U1K5g@mail.gmail.com> (raw)
In-Reply-To: <550518d6-fd50-72be-7c84-71153b470cfd@hisilicon.com>

On Wed, Dec 2, 2020 at 7:13 PM Xiaqing (A) <saberlily.xia@hisilicon.com> wrote:
>
>
>
> On 2020/12/3 2:27, Yang Shi wrote:
> > The tracepoint's nid should show what node the shrink happens on, the start tracepoint
> > uses nid from shrinkctl, but the nid might be set to 0 before end tracepoint if the
> > shrinker is not NUMA aware, so the traceing log may show the shrink happens on one
> > node but end up on the other node.  It seems confusing.  And the following patch
> > will remove using nid directly in do_shrink_slab(), this patch also helps cleanup
> > the code.
> >
> > Signed-off-by: Yang Shi <shy828301@gmail.com>
> > ---
> >   mm/vmscan.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > index 7d6186a07daf..457ce04eebf2 100644
> > --- a/mm/vmscan.c
> > +++ b/mm/vmscan.c
> > @@ -533,7 +533,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
> >       new_nr = atomic_long_add_return(next_deferred,
> >                                       &shrinker->nr_deferred[nid]);
> >
> > -     trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
> > +     trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
>
> Hi, Yang
>
> When I read this patch, I wondered why you modified it so much until I read patch6. Could you merge
> this patch into patch6?

Sorry for the late reply. It could be, but I was inclined to think
this is a bug and we might need backport it to stable, so I leave it
as a standalone patch.

>
> Thanks!
>
> >       return freed;
> >   }
> >
>

  reply	other threads:[~2020-12-11 20:59 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-02 18:27 [RFC PATCH 0/9] Make shrinker's nr_deferred memcg aware Yang Shi
2020-12-02 18:27 ` [PATCH 1/9] mm: vmscan: simplify nr_deferred update code Yang Shi
2020-12-03  2:56   ` Roman Gushchin
2020-12-02 18:27 ` [PATCH 2/9] mm: vmscan: use nid from shrink_control for tracepoint Yang Shi
2020-12-03  3:13   ` Xiaqing (A)
2020-12-11 19:20     ` Yang Shi [this message]
2020-12-02 18:27 ` [PATCH 3/9] mm: memcontrol: rename memcg_shrinker_map_mutex to memcg_shrinker_mutex Yang Shi
2020-12-02 18:27 ` [PATCH 4/9] mm: vmscan: use a new flag to indicate shrinker is registered Yang Shi
2020-12-03  3:01   ` Roman Gushchin
2020-12-03  4:59     ` Yang Shi
2020-12-03 20:08       ` Roman Gushchin
2020-12-03 22:25         ` Yang Shi
2020-12-04 18:52           ` Johannes Weiner
2020-12-04 21:24             ` Yang Shi
2020-12-02 18:27 ` [PATCH 5/9] mm: memcontrol: add per memcg shrinker nr_deferred Yang Shi
2020-12-03  3:06   ` Roman Gushchin
2020-12-03  4:54     ` Yang Shi
2020-12-03 18:03       ` Yang Shi
2020-12-03 20:07         ` Roman Gushchin
2020-12-03 22:49           ` Yang Shi
2020-12-03 23:30             ` Roman Gushchin
2020-12-04  0:22               ` Yang Shi
2020-12-10 15:33   ` Johannes Weiner
2020-12-10 19:12     ` Yang Shi
2020-12-11 17:52       ` Yang Shi
2020-12-10 21:59     ` Yang Shi
2020-12-02 18:27 ` [PATCH 6/9] mm: vmscan: use per memcg nr_deferred of shrinker Yang Shi
2020-12-03  3:08   ` Roman Gushchin
2020-12-03  5:01     ` Yang Shi
2020-12-03 11:40   ` Kirill Tkhai
2020-12-08 17:13     ` Yang Shi
2020-12-09 15:41       ` Kirill Tkhai
2020-12-09 17:32         ` Yang Shi
2020-12-10 15:13           ` Johannes Weiner
2020-12-10 15:17             ` Kirill Tkhai
2020-12-15 16:44               ` Johannes Weiner
2020-12-02 18:27 ` [PATCH 7/9] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Yang Shi
2020-12-02 18:27 ` [PATCH 8/9] mm: memcontrol: reparent nr_deferred when memcg offline Yang Shi
2020-12-02 18:27 ` [PATCH 9/9] mm: vmscan: shrink deferred objects proportional to priority Yang Shi
2020-12-03  2:52 ` [RFC PATCH 0/9] Make shrinker's nr_deferred memcg aware Roman Gushchin
2020-12-03 17:52   ` Yang Shi

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