linux-kernel - Re: [PATCH] mm: change mm_vmscan_lru_shrink

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Message-ID: <5645E2A4.3010509@suse.cz>
Date:	Fri, 13 Nov 2015 14:16:20 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	yalin wang <yalin.wang2010@...il.com>, rostedt@...dmis.org,
	mingo@...hat.com, namhyung@...nel.org, acme@...hat.com,
	akpm@...ux-foundation.org, mhocko@...e.cz, hannes@...xchg.org,
	vdavydov@...allels.com, mgorman@...hsingularity.net,
	bywxiaobai@....com, tj@...nel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] mm: change mm_vmscan_lru_shrink_inactive() proto types

On 11/12/2015 08:54 AM, yalin wang wrote:
> Move node_id zone_idx shrink flags into trace function,
> so thay we don't need caculate these args if the trace is disabled,
> and will make this function have less arguments.
>
> Signed-off-by: yalin wang <yalin.wang2010@...il.com>
> ---
>   include/trace/events/vmscan.h | 14 +++++++-------
>   mm/vmscan.c                   |  7 ++-----
>   2 files changed, 9 insertions(+), 12 deletions(-)
>
> diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
> index dae7836..f8d6b34 100644
> --- a/include/trace/events/vmscan.h
> +++ b/include/trace/events/vmscan.h
> @@ -352,11 +352,11 @@ TRACE_EVENT(mm_vmscan_writepage,
>
>   TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
>
> -	TP_PROTO(int nid, int zid,
> -			unsigned long nr_scanned, unsigned long nr_reclaimed,
> -			int priority, int reclaim_flags),
> +	TP_PROTO(struct zone *zone,
> +		unsigned long nr_scanned, unsigned long nr_reclaimed,
> +		int priority, int file),
>
> -	TP_ARGS(nid, zid, nr_scanned, nr_reclaimed, priority, reclaim_flags),
> +	TP_ARGS(zone, nr_scanned, nr_reclaimed, priority, file),
>
>   	TP_STRUCT__entry(
>   		__field(int, nid)
> @@ -368,12 +368,12 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
>   	),
>
>   	TP_fast_assign(
> -		__entry->nid = nid;
> -		__entry->zid = zid;
> +		__entry->nid = zone->zone_pgdat->node_id;

While at it, convert it to zone_to_nid()? It's not just encapsulation, 
but also one less pointer dereference.

Then you can add my Acked-by.

Thanks.

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