[PATCH 3/4] hugetlb: add hugepagesnid= command-line option

[Luiz Capitulino]

From: Luiz capitulino <lcapitulino@xxxxxxxxxx>

The HugeTLB command-line option hugepages= allow the user to specify
how many huge pages should be allocated at boot-time. On NUMA systems,
this option will try to automatically distribute the allocation equally
among nodes. For example, if you have a 2-node NUMA system and allocates
200 huge pages, than hugepages= will try to allocate 100 huge pages from
node0 and 100 from node1.

The hugepagesnid= option introduced by this commit allows the user
to specify the nodes from which huge pages are allocated. For example,
if you have a 2-node NUMA system and want 300 2M huge pages to be
allocated from node1, you could do:

 hugepagesnid=1,300,2M

Or, say you want node0 to allocate 100 huge pages and node1 to
allocate 200 huge pages, you do:

 hugepagesnid=0,100,2M hugepagesnid=1,200,1M

This commit adds support only for 2M huge pages, next commit will
add support for 1G huge pages.

Signed-off-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
---
 Documentation/kernel-parameters.txt |  8 ++++
 arch/x86/mm/hugetlbpage.c           | 35 +++++++++++++++++
 include/linux/hugetlb.h             |  2 +
 mm/hugetlb.c                        | 77 +++++++++++++++++++++++++++++++++++++
 4 files changed, 122 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7116fda..3cbe950 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1125,6 +1125,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			registers.  Default set by CONFIG_HPET_MMAP_DEFAULT.
 
 	hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
+	hugepagesnid= [X86-64] HugeTLB pages to allocate at boot on a NUMA system.
+				Format: <nid>,<nrpages>,<size>
+				nid: NUMA node id to allocate pages from
+				nrpages: number of huge pages to allocate
+				size: huge pages size (see hugepagsz below)
+			This argument can be specified multiple times for different
+			NUMA nodes, but it shouldn't be mixed with hugepages= and
+			hugepagesz=.
 	hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
 			On x86-64 and powerpc, this option can be specified
 			multiple times interleaved with hugepages= to reserve
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 8c9f647..91c5c98 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -188,4 +188,39 @@ static __init int setup_hugepagesz(char *opt)
 	return 1;
 }
 __setup("hugepagesz=", setup_hugepagesz);
+
+static __init int setup_hugepagesnid(char *opt)
+{
+	unsigned long order, ps, nid, nr_pages;
+	char size_str[3];
+
+	size_str[2] = '\0';
+	if (sscanf(opt, "%lu,%lu,%c%c",
+			&nid, &nr_pages, &size_str[0], &size_str[1]) < 4) {
+		printk(KERN_ERR "hugepagesnid: failed to parse arguments\n");
+			return 0;
+	}
+
+	if (!nr_pages) {
+		printk(KERN_ERR
+			"hugepagesnid: zero number of pages, ignoring\n");
+		return 0;
+	}
+
+	ps = memparse(size_str, NULL);
+	if (ps == PMD_SIZE) {
+		order = PMD_SHIFT - PAGE_SHIFT;
+	} else if (ps == PUD_SIZE && cpu_has_gbpages) {
+		order = PUD_SHIFT - PAGE_SHIFT;
+	} else {
+		printk(KERN_ERR "hugepagesnid: Unsupported page size %lu M\n",
+			ps >> 20);
+		return 0;
+	}
+
+	hugetlb_add_nrpages_nid(order, nid, nr_pages);
+	return 1;
+}
+__setup("hugepagesnid=", setup_hugepagesnid);
+
 #endif
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc4..aae2f9b 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -274,6 +274,8 @@ struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
 int __init alloc_bootmem_huge_page(struct hstate *h);
 
 void __init hugetlb_add_hstate(unsigned order);
+void __init hugetlb_add_nrpages_nid(unsigned order, unsigned long nid,
+				unsigned long nr_pages);
 struct hstate *size_to_hstate(unsigned long size);
 
 #ifndef HUGE_MAX_HSTATE
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c01cb9f..439c3b7 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -46,6 +46,7 @@ __initdata LIST_HEAD(huge_boot_pages);
 static struct hstate * __initdata parsed_hstate;
 static unsigned long __initdata default_hstate_max_huge_pages;
 static unsigned long __initdata default_hstate_size;
+static unsigned long __initdata boot_alloc_nodes[HUGE_MAX_HSTATE][MAX_NUMNODES];
 
 /*
  * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages,
@@ -1348,6 +1349,50 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
 	h->max_huge_pages = i;
 }
 
+static unsigned long __init alloc_huge_pages_nid(struct hstate *h,
+						int nid,
+						unsigned long nr_pages)
+{
+	unsigned long i;
+	struct page *page;
+
+	for (i = 0; i < nr_pages; i++) {
+		page = alloc_fresh_huge_page_node(h, nid);
+		if (!page) {
+			count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
+			break;
+		}
+		count_vm_event(HTLB_BUDDY_PGALLOC);
+	}
+
+	return i;
+}
+
+static unsigned long __init alloc_huge_pages_nodes(struct hstate *h)
+{
+	unsigned long i, *entry, ret = 0;
+
+	for (i = 0; i < MAX_NUMNODES; i++) {
+		entry = &boot_alloc_nodes[hstate_index(h)][i];
+		if (*entry > 0)
+			ret += alloc_huge_pages_nid(h, i, *entry);
+	}
+
+	return ret;
+}
+
+static void __init hugetlb_init_hstates_nodes(void)
+{
+	struct hstate *h;
+	unsigned long ret;
+
+	for_each_hstate(h)
+		if (h->order < MAX_ORDER) {
+			ret = alloc_huge_pages_nodes(h);
+			h->max_huge_pages += ret;
+		}
+}
+
 static void __init hugetlb_init_hstates(void)
 {
 	struct hstate *h;
@@ -1966,6 +2011,7 @@ static int __init hugetlb_init(void)
 		default_hstate.max_huge_pages = default_hstate_max_huge_pages;
 
 	hugetlb_init_hstates();
+	hugetlb_init_hstates_nodes();
 	gather_bootmem_prealloc();
 	report_hugepages();
 
@@ -2005,6 +2051,37 @@ void __init hugetlb_add_hstate(unsigned order)
 	parsed_hstate = h;
 }
 
+void __init hugetlb_add_nrpages_nid(unsigned order, unsigned long nid,
+				unsigned long nr_pages)
+{
+	struct hstate *h;
+	unsigned long *p;
+
+	if (parsed_hstate) {
+		printk(KERN_WARNING
+			"hugepagesnid: hugepagesz= specified, ignoring\n");
+		return;
+	}
+
+	for_each_hstate(h)
+		if (h->order == order)
+			break;
+
+	if (h->order != order) {
+		hugetlb_add_hstate(order);
+		parsed_hstate = NULL;
+	}
+
+	p = &boot_alloc_nodes[hstate_index(h)][nid];
+	if (*p != 0) {
+		printk(KERN_WARNING
+			"hugepagesnid: node %lu already specified, ignoring\n", nid);
+		return;
+	}
+
+	*p = nr_pages;
+}
+
 static int __init hugetlb_nrpages_setup(char *s)
 {
 	unsigned long *mhp;
-- 
1.8.1.4

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