linux-kernel - [PATCH 4/4] hugetlb: hugepagesnid=: add 1G huge page support

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Message-Id: <1392053268-29239-5-git-send-email-lcapitulino@redhat.com>
Date:	Mon, 10 Feb 2014 12:27:48 -0500
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mtosatti@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	andi@...stfloor.org, riel@...hat.com
Subject: [PATCH 4/4] hugetlb: hugepagesnid=: add 1G huge page support

From: Luiz capitulino <lcapitulino@...hat.com>

Signed-off-by: Luiz capitulino <lcapitulino@...hat.com>
---
 mm/hugetlb.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 439c3b7..d759321 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2051,6 +2051,29 @@ void __init hugetlb_add_hstate(unsigned order)
 	parsed_hstate = h;
 }
 
+static void __init hugetlb_hstate_alloc_pages_nid(struct hstate *h,
+						int nid,
+						unsigned long nr_pages)
+{
+	struct huge_bootmem_page *m;
+	unsigned long i;
+	void *addr;
+
+	for (i = 0; i < nr_pages; i++) {
+		addr = memblock_virt_alloc_nid_nopanic(
+				huge_page_size(h), huge_page_size(h),
+				0, BOOTMEM_ALLOC_ACCESSIBLE, nid);
+		if (!addr)
+			break;
+		m = addr;
+		BUG_ON((unsigned long)virt_to_phys(m) & (huge_page_size(h) - 1));
+		list_add(&m->list, &huge_boot_pages);
+		m->hstate = h;
+	}
+
+	h->max_huge_pages += i;
+}
+
 void __init hugetlb_add_nrpages_nid(unsigned order, unsigned long nid,
 				unsigned long nr_pages)
 {
@@ -2080,6 +2103,9 @@ void __init hugetlb_add_nrpages_nid(unsigned order, unsigned long nid,
 	}
 
 	*p = nr_pages;
+
+	if (h->order >= MAX_ORDER)
+		hugetlb_hstate_alloc_pages_nid(h, nid, nr_pages);
 }
 
 static int __init hugetlb_nrpages_setup(char *s)
-- 
1.8.1.4

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