linux-kernel - Re: [PATCH] [1/18] Convert hugeltlb.c over to pass global state around in a structure

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Date:	Mon, 17 Mar 2008 15:15:31 -0500
From:	Adam Litke <agl@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, pj@....com, linux-mm@...ck.org,
	nickpiggin@...oo.com.au, agl <agl@...ux.vnet.ibm.com>
Subject: Re: [PATCH] [1/18] Convert hugeltlb.c over to pass global state
	around in a structure

I didn't see anything fundamentally wrong with this... In fact it is
looking really nice notwithstanding the minor nits below.

On Mon, 2008-03-17 at 02:58 +0100, Andi Kleen wrote:
> Large, but rather mechanical patch that converts most of the hugetlb.c
> globals into structure members and passes them around.
> 
> Right now there is only a single global hstate structure, but 
> most of the infrastructure to extend it is there.
> 
> Signed-off-by: Andi Kleen <ak@...e.de>
> 
<snip>
> @@ -117,23 +113,24 @@ static struct page *dequeue_huge_page_vm
>  	return page;
>  }
> 
> -static void update_and_free_page(struct page *page)
> +static void update_and_free_page(struct hstate *h, struct page *page)
>  {
>  	int i;
> -	nr_huge_pages--;
> -	nr_huge_pages_node[page_to_nid(page)]--;
> -	for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) {
> +	h->nr_huge_pages--;
> +	h->nr_huge_pages_node[page_to_nid(page)]--;
> +	for (i = 0; i < (1 << huge_page_order(h)); i++) {
>  		page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced |
>  				1 << PG_dirty | 1 << PG_active | 1 << PG_reserved |
>  				1 << PG_private | 1<< PG_writeback);
>  	}

Could you define a macro for (1 << huge_page_order(h))?  It is used at
least 4 times.  How about something like pages_per_huge_page(h) or
something?  I think that would convey the meaning more clearly.

<snip>

> @@ -190,18 +187,18 @@ static int adjust_pool_surplus(int delta
>  	return ret;
>  }
> 
> -static struct page *alloc_fresh_huge_page_node(int nid)
> +static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
>  {
>  	struct page *page;
> 
>  	page = alloc_pages_node(nid,
>  		htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE|__GFP_NOWARN,
> -		HUGETLB_PAGE_ORDER);
> +			huge_page_order(h));

Whitespace?

<snip>

> @@ -272,17 +270,17 @@ static struct page *alloc_buddy_huge_pag
>  	 * per-node value is checked there.
>  	 */
>  	spin_lock(&hugetlb_lock);
> -	if (surplus_huge_pages >= nr_overcommit_huge_pages) {
> +	if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) {
>  		spin_unlock(&hugetlb_lock);
>  		return NULL;
>  	} else {
> -		nr_huge_pages++;
> -		surplus_huge_pages++;
> +		h->nr_huge_pages++;
> +		h->surplus_huge_pages++;
>  	}
>  	spin_unlock(&hugetlb_lock);
> 
>  	page = alloc_pages(htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN,
> -					HUGETLB_PAGE_ORDER);
> +			   huge_page_order(h));

Whitespace?

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

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