linux-kernel - Re: [PATCH] vmallocinfo: Add NUMA informations

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Date:	Mon, 02 Jun 2008 16:09:18 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmallocinfo: Add NUMA informations 

Hi

> Christoph recently added /proc/vmallocinfo file to get information about 
> vmalloc allocations.
> 
> This patch adds NUMA specific information, giving number of pages 
> allocated on each memory node.
> 
> This should help to check that vmalloc() is able to respect NUMA policies.

good patch :)


> +static void show_numa_infos(struct seq_file *m, struct vm_struct *v)
> +{
> +	if (NUMA_BUILD) {
> +		unsigned int *counters, nr;
> +
> +		counters = kzalloc(MAX_NUMNODES * sizeof(unsigned int),
> +				   GFP_KERNEL);
> +		if (!counters)
> +			return;
> +
> +		for (nr = 0; nr < v->nr_pages; nr++)
> +			counters[page_to_nid(v->pages[nr])]++;
> +
> +		for (nr = 0; nr < MAX_NUMNODES; nr++)
> +			if (counters[nr])
> +				seq_printf(m, " N%u=%u", nr, counters[nr]);
> +

for_each_node_state(n, N_HIGH_MEMORY) is better?
because MAX_NUMNODES has offten very large value.




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