linux-kernel - Re: [PATCH] Add nid sanity on alloc_pages

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Date:	Sat, 14 Jul 2007 10:40:25 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"Joe Jin" <joe.jin@...cle.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>, bill.irwin@...cle.com,
	linux-kernel@...r.kernel.org, gurudas.pai@...cle.com,
	"Paul Jackson" <pj@....com>
Subject: Re: [PATCH] Add nid sanity on alloc_pages_node

On 7/13/07, Joe Jin <joe.jin@...cle.com> wrote:
> >
> > Patch gone too ;) I deleted it.  I was hoping that you'd send me the final
> > finished product (please).
> >
>
> Ha.., the patch against 2.6.22, at your patch have use htlb_alloc_mask, but I
> cannot found it at 2.6.22 kernel tree, I think you must use difference kernel
> tree :)

I believe this patch will be unnecessary if my "Fix hugetlb pool
allocation with empty nodes" patch gets pulled into -mm.
alloc_fresh_huge_page() now takes a mempolicy which is created by the
two callers, rather than reinventing interleaving itself. I believe
this will avoid the oops you saw. I am still waiting on some test
results (annoying -mm config changes) before I repost them (and they
depend on Christoph's fixes for memoryless nodes).

Thanks,
Nish

> --- linux-2.6.22/mm/hugetlb.c.orig      2007-07-12 15:02:19.000000000 +0800
> +++ linux-2.6.22/mm/hugetlb.c   2007-07-13 17:33:45.000000000 +0800
> @@ -101,13 +101,20 @@ static void free_huge_page(struct page *
>
>  static int alloc_fresh_huge_page(void)
>  {
> -       static int nid = 0;
> +       static int prev_nid;
>         struct page *page;
> -       page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
> -                                       HUGETLB_PAGE_ORDER);
> -       nid = next_node(nid, node_online_map);
> +       static DEFINE_SPINLOCK(nid_lock);
> +       int nid;
> +
> +       spin_lock(&nid_lock);
> +       nid = next_node(prev_nid, node_online_map);
>         if (nid == MAX_NUMNODES)
>                 nid = first_node(node_online_map);
> +       prev_nid = nid;
> +       spin_unlock(&nid_lock);
> +
> +       page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN,
> +                                       HUGETLB_PAGE_ORDER);
>         if (page) {
>                 set_compound_page_dtor(page, free_huge_page);
>                 spin_lock(&hugetlb_lock);
> -
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