linux-kernel - Re: [PATCH] [3/18] Convert /proc output code over to report multiple hstates

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Message-ID: <20080318122829.GC23866@csn.ul.ie>
Date:	Tue, 18 Mar 2008 12:28:29 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, pj@....com, linux-mm@...ck.org,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] [3/18] Convert /proc output code over to report multiple hstates

On (17/03/08 02:58), Andi Kleen didst pronounce:
> I chose to just report the numbers in a row, in the hope 
> to minimze breakage of existing software. The "compat" page size
> is always the first number.
> 

Glancing through the libhugetlbfs code, it appears to take the first
value after Hugepagesize: as the "huge pagesize" so I suspect you're
safe there at least FWIW.

> Signed-off-by: Andi Kleen <ak@...e.de>
> 
> ---
>  mm/hugetlb.c |   59 +++++++++++++++++++++++++++++++++++++++--------------------
>  1 file changed, 39 insertions(+), 20 deletions(-)
> 
> Index: linux/mm/hugetlb.c
> ===================================================================
> --- linux.orig/mm/hugetlb.c
> +++ linux/mm/hugetlb.c
> @@ -683,37 +683,56 @@ int hugetlb_overcommit_handler(struct ct
>  
>  #endif /* CONFIG_SYSCTL */
>  
> +static int dump_field(char *buf, unsigned field)
> +{
> +	int n = 0;
> +	struct hstate *h;
> +	for_each_hstate (h)
> +		n += sprintf(buf + n, " %5lu", *(unsigned long *)((char *)h + field));
> +	buf[n++] = '\n';
> +	return n;
> +}
> +
>  int hugetlb_report_meminfo(char *buf)
>  {
> -	struct hstate *h = &global_hstate;
> -	return sprintf(buf,
> -			"HugePages_Total: %5lu\n"
> -			"HugePages_Free:  %5lu\n"
> -			"HugePages_Rsvd:  %5lu\n"
> -			"HugePages_Surp:  %5lu\n"
> -			"Hugepagesize:    %5lu kB\n",
> -			h->nr_huge_pages,
> -			h->free_huge_pages,
> -			h->resv_huge_pages,
> -			h->surplus_huge_pages,
> -			1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
> +	struct hstate *h;
> +	int n = 0;
> +	n += sprintf(buf + 0, "HugePages_Total:");
> +	n += dump_field(buf + n, offsetof(struct hstate, nr_huge_pages));
> +	n += sprintf(buf + n, "HugePages_Free: ");
> +	n += dump_field(buf + n, offsetof(struct hstate, free_huge_pages));
> +	n += sprintf(buf + n, "HugePages_Rsvd: ");
> +	n += dump_field(buf + n, offsetof(struct hstate, resv_huge_pages));
> +	n += sprintf(buf + n, "HugePages_Surp: ");
> +	n += dump_field(buf + n, offsetof(struct hstate, surplus_huge_pages));
> +	n += sprintf(buf + n, "Hugepagesize:   ");
> +	for_each_hstate (h)
> +		n += sprintf(buf + n, " %5u", huge_page_size(h) / 1024);
> +	n += sprintf(buf + n, " kB\n");
> +	return n;
>  }
>  
>  int hugetlb_report_node_meminfo(int nid, char *buf)
>  {
> -	struct hstate *h = &global_hstate;
> -	return sprintf(buf,
> -		"Node %d HugePages_Total: %5u\n"
> -		"Node %d HugePages_Free:  %5u\n",
> -		nid, h->nr_huge_pages_node[nid],
> -		nid, h->free_huge_pages_node[nid]);
> +	int n = 0;
> +	n += sprintf(buf, "Node %d HugePages_Total:", nid);
> +	n += dump_field(buf + n, offsetof(struct hstate,
> +						nr_huge_pages_node[nid]));
> +	n += sprintf(buf + n , "Node %d HugePages_Free: ", nid);
> +	n += dump_field(buf + n, offsetof(struct hstate,
> +						 free_huge_pages_node[nid]));
> +	return n;
>  }
>  
>  /* Return the number pages of memory we physically have, in PAGE_SIZE units. */
>  unsigned long hugetlb_total_pages(void)
>  {
> -	struct hstate *h = &global_hstate;
> -	return h->nr_huge_pages * (1 << huge_page_order(h));
> +	long x = 0;
> +	struct hstate *h;
> +	for_each_hstate (h) {
> +		x += h->nr_huge_pages * (1 << huge_page_order(h));
> +	}
> +	return x;
>  }
>  
>  /*
> 
> --
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> see: http://www.linux-mm.org/ .
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> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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