linux-kernel - Re: [v7 PATCH 01/12] mm: vmscan: use nid from shrink

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Date:   Tue, 9 Feb 2021 11:21:29 -0800
From:   Roman Gushchin <guro@...com>
To:     Yang Shi <shy828301@...il.com>
CC:     <ktkhai@...tuozzo.com>, <vbabka@...e.cz>, <shakeelb@...gle.com>,
        <david@...morbit.com>, <hannes@...xchg.org>, <mhocko@...e.com>,
        <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v7 PATCH 01/12] mm: vmscan: use nid from shrink_control for
 tracepoint

On Tue, Feb 09, 2021 at 09:46:35AM -0800, 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.
> 
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> Signed-off-by: Yang Shi <shy828301@...il.com>

Acked-by: Roman Gushchin <guro@...com>

> ---
>  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;
>  }
>  
> -- 
> 2.26.2
>