linux-kernel - Re: [PATCH mmotm] Fix NUMA accounting in numastat.txt

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Date:	Tue, 1 Sep 2009 16:17:21 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH mmotm] Fix NUMA accounting in numastat.txt

On Tue, 1 Sep 2009 13:53:21 +0900
Minchan Kim <minchan.kim@...il.com> wrote:

> 
> In Documentation/numastat.txt, it confused me.
> For example, there are nodes [0,1] in system.
> 
> barrios:~$ cat /proc/zoneinfo | egrep 'numa|zone'
> Node 0, zone	DMA
> 	numa_hit	33226
> 	numa_miss	1739
> 	numa_foreign	27978
> 	..
> 	..
> Node 1, zone	DMA
> 	numa_hit	307
> 	numa_miss	46900
> 	numa_foreign	0
> 
> 1) In node 0,  NUMA_MISS means it wanted to allocate page
> in node 1 but ended up with page in node 0
> 
> 2) In node 0, NUMA_FOREIGN means it wanted to allocate page
> in node 0 but ended up with page from Node 1.
> 
> But now, numastat explains it oppositely about (MISS, FOREIGN).
> Let's fix up with viewpoint of zone. 
> 

I'm confused....documentation is really bad ?
Implementation isn't ?

Hmm, this function ?
==
void zone_statistics(struct zone *preferred_zone, struct zone *z)
{
        if (z->zone_pgdat == preferred_zone->zone_pgdat) {
                __inc_zone_state(z, NUMA_HIT);
        } else {
                __inc_zone_state(z, NUMA_MISS);
                __inc_zone_state(preferred_zone, NUMA_FOREIGN);
        }
        if (z->node == numa_node_id())
                __inc_zone_state(z, NUMA_LOCAL);
        else
                __inc_zone_state(z, NUMA_OTHER);
}
==
I wonder
==
void zone_statistics(struct zone *preferred_zone, struct zone *z)
{
        if (z->zone_pgdat == preferred_zone->zone_pgdat) {
                __inc_zone_state(z, NUMA_HIT);
        } else {
                __inc_zone_state(preferred_zone, NUMA_MISS);
                __inc_zone_state(z, NUMA_FOREIGN);
        }
        if (z->node == numa_node_id())
                __inc_zone_state(z, NUMA_LOCAL);
        else
                __inc_zone_state(z, NUMA_OTHER);
}
==
Is correct fix ....

Thanks,
-Kame


> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  Documentation/numastat.txt |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/numastat.txt b/Documentation/numastat.txt
> index 80133ac..9fcc9a6 100644
> --- a/Documentation/numastat.txt
> +++ b/Documentation/numastat.txt
> @@ -7,10 +7,10 @@ All units are pages. Hugepages have separate counters.
> 
>  numa_hit			A process wanted to allocate memory from this node,
>  					and succeeded.
> -numa_miss			A process wanted to allocate memory from this node,
> -					but ended up with memory from another.
> -numa_foreign		A process wanted to allocate on another node,
> -				    but ended up with memory from this one.
> +numa_miss			A process wanted to allocate memory from another node,
> +					but ended up with memory from this node.
> +numa_foreign		A process wanted to allocate on this node,
> +				    but ended up with memory from another one.
>  local_node			A process ran on this node and got memory from it.
>  other_node			A process ran on this node and got memory from another node.
>  interleave_hit 		Interleaving wanted to allocate from this node
> --
> 1.5.4.3
> 
> 
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> --
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