linux-kernel - Re: [v5 PATCH 01/11] mm: vmscan: use nid from shrink

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Date:   Thu, 28 Jan 2021 17:02:32 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Yang Shi <shy828301@...il.com>, guro@...com, ktkhai@...tuozzo.com,
        shakeelb@...gle.com, david@...morbit.com, hannes@...xchg.org,
        mhocko@...e.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v5 PATCH 01/11] mm: vmscan: use nid from shrink_control for
 tracepoint

On 1/28/21 12:33 AM, 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@...il.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/vmscan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index b1b574ad199d..b512dd5e3a1c 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -535,7 +535,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
>  	else
>  		new_nr = atomic_long_read(&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);
>  	return freed;
>  }
>  
>