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Date: Thu, 31 Jul 2008 20:55:47 +0900
From: Yasunori Goto <y-goto@...fujitsu.com>
To: Badari Pulavarty <pbadari@...ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>,
Christoph Lameter <cl@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>,
Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: [RFC:Patch: 001/008](memory hotplug) change parameter from pointer of zonelist to node id
This is preparation patch for the later patch.
Current code passes the pointer of zonelist to __alloc_pages() to
specify which zonelist should be used.
However, its parameter also means which node(pgdat)'s zonelist
should be used for parsing.
This patch change interface from zonelist pointer to node id (zonelist_nid)
which has target zonelist.
Because node id is easy to check node online/offline.
Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>
---
include/linux/gfp.h | 12 +++++------
include/linux/mempolicy.h | 2 -
mm/hugetlb.c | 4 ++-
mm/mempolicy.c | 50 +++++++++++++++++++++++-----------------------
mm/page_alloc.c | 21 ++++++++++++-------
5 files changed, 49 insertions(+), 40 deletions(-)
Index: current/include/linux/gfp.h
===================================================================
--- current.orig/include/linux/gfp.h 2008-07-31 18:54:09.000000000 +0900
+++ current/include/linux/gfp.h 2008-07-31 18:54:18.000000000 +0900
@@ -175,20 +175,20 @@ static inline void arch_alloc_page(struc
struct page *
__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist, nodemask_t *nodemask);
+ int zonelist_nid, nodemask_t *nodemask);
static inline struct page *
__alloc_pages(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist)
+ int zonelist_nid)
{
- return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
+ return __alloc_pages_internal(gfp_mask, order, zonelist_nid, NULL);
}
static inline struct page *
__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist, nodemask_t *nodemask)
+ int zonelist_nid, nodemask_t *nodemask)
{
- return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
+ return __alloc_pages_internal(gfp_mask, order, zonelist_nid, nodemask);
}
@@ -202,7 +202,7 @@ static inline struct page *alloc_pages_n
if (nid < 0)
nid = numa_node_id();
- return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
+ return __alloc_pages(gfp_mask, order, nid);
}
#ifdef CONFIG_NUMA
Index: current/mm/mempolicy.c
===================================================================
--- current.orig/mm/mempolicy.c 2008-07-31 18:54:09.000000000 +0900
+++ current/mm/mempolicy.c 2008-07-31 18:54:59.000000000 +0900
@@ -1329,7 +1329,7 @@ static nodemask_t *policy_nodemask(gfp_t
}
/* Return a zonelist indicated by gfp for node representing a mempolicy */
-static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy)
+static int policy_node(gfp_t gfp, struct mempolicy *policy)
{
int nd = numa_node_id();
@@ -1354,7 +1354,7 @@ static struct zonelist *policy_zonelist(
default:
BUG();
}
- return node_zonelist(nd, gfp);
+ return nd;
}
/* Do dynamic interleaving for a process */
@@ -1459,36 +1459,35 @@ static inline unsigned interleave_nid(st
#ifdef CONFIG_HUGETLBFS
/*
- * huge_zonelist(@vma, @addr, @gfp_flags, @mpol)
+ * huge_node(@vma, @addr, @gfp_flags, @mpol)
* @vma = virtual memory area whose policy is sought
* @addr = address in @vma for shared policy lookup and interleave policy
* @gfp_flags = for requested zone
* @mpol = pointer to mempolicy pointer for reference counted mempolicy
* @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask
*
- * Returns a zonelist suitable for a huge page allocation and a pointer
+ * Returns node id suitable for a huge page allocation and a pointer
* to the struct mempolicy for conditional unref after allocation.
* If the effective policy is 'BIND, returns a pointer to the mempolicy's
* @nodemask for filtering the zonelist.
*/
-struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr,
- gfp_t gfp_flags, struct mempolicy **mpol,
- nodemask_t **nodemask)
+int huge_node(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags,
+ struct mempolicy **mpol, nodemask_t **nodemask)
{
- struct zonelist *zl;
+ int nid;
*mpol = get_vma_policy(current, vma, addr);
*nodemask = NULL; /* assume !MPOL_BIND */
- if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) {
- zl = node_zonelist(interleave_nid(*mpol, vma, addr,
- huge_page_shift(hstate_vma(vma))), gfp_flags);
- } else {
- zl = policy_zonelist(gfp_flags, *mpol);
+ if (unlikely((*mpol)->mode == MPOL_INTERLEAVE))
+ nid = interleave_nid(*mpol, vma, addr,
+ huge_page_shift(hstate_vma(vma)));
+ else {
+ nid = policy_node(gfp_flags, *mpol);
if ((*mpol)->mode == MPOL_BIND)
*nodemask = &(*mpol)->v.nodes;
}
- return zl;
+ return nid;
}
#endif
@@ -1497,13 +1496,15 @@ struct zonelist *huge_zonelist(struct vm
static struct page *alloc_page_interleave(gfp_t gfp, unsigned order,
unsigned nid)
{
- struct zonelist *zl;
struct page *page;
- zl = node_zonelist(nid, gfp);
- page = __alloc_pages(gfp, order, zl);
- if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0]))
- inc_zone_page_state(page, NUMA_INTERLEAVE_HIT);
+ page = __alloc_pages(gfp, order, nid);
+ if (page) {
+ struct zonelist *zl;
+ zl = node_zonelist(nid, gfp);
+ if (page_zone(page) == zonelist_zone(&zl->_zonerefs[0]))
+ inc_zone_page_state(page, NUMA_INTERLEAVE_HIT);
+ }
return page;
}
@@ -1533,31 +1534,30 @@ struct page *
alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr)
{
struct mempolicy *pol = get_vma_policy(current, vma, addr);
- struct zonelist *zl;
+ int nid;
cpuset_update_task_memory_state();
if (unlikely(pol->mode == MPOL_INTERLEAVE)) {
- unsigned nid;
nid = interleave_nid(pol, vma, addr, PAGE_SHIFT);
mpol_cond_put(pol);
return alloc_page_interleave(gfp, 0, nid);
}
- zl = policy_zonelist(gfp, pol);
+ nid = policy_node(gfp, pol);
if (unlikely(mpol_needs_cond_ref(pol))) {
/*
* slow path: ref counted shared policy
*/
struct page *page = __alloc_pages_nodemask(gfp, 0,
- zl, policy_nodemask(gfp, pol));
+ nid, policy_nodemask(gfp, pol));
__mpol_put(pol);
return page;
}
/*
* fast path: default or task policy
*/
- return __alloc_pages_nodemask(gfp, 0, zl, policy_nodemask(gfp, pol));
+ return __alloc_pages_nodemask(gfp, 0, nid, policy_nodemask(gfp, pol));
}
/**
@@ -1595,7 +1595,7 @@ struct page *alloc_pages_current(gfp_t g
if (pol->mode == MPOL_INTERLEAVE)
return alloc_page_interleave(gfp, order, interleave_nodes(pol));
return __alloc_pages_nodemask(gfp, order,
- policy_zonelist(gfp, pol), policy_nodemask(gfp, pol));
+ policy_node(gfp, pol), policy_nodemask(gfp, pol));
}
EXPORT_SYMBOL(alloc_pages_current);
Index: current/mm/page_alloc.c
===================================================================
--- current.orig/mm/page_alloc.c 2008-07-31 18:54:09.000000000 +0900
+++ current/mm/page_alloc.c 2008-07-31 19:01:46.000000000 +0900
@@ -1383,7 +1383,8 @@ static void zlc_mark_zone_full(struct zo
*/
static struct page *
get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
- struct zonelist *zonelist, int high_zoneidx, int alloc_flags)
+ struct zonelist *zonelist, int high_zoneidx, int alloc_flags,
+ int zonelist_nid)
{
struct zoneref *z;
struct page *page = NULL;
@@ -1514,7 +1515,7 @@ static void set_page_owner(struct page *
*/
struct page *
__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist, nodemask_t *nodemask)
+ int zonelist_nid, nodemask_t *nodemask)
{
const gfp_t wait = gfp_mask & __GFP_WAIT;
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
@@ -1527,6 +1528,7 @@ __alloc_pages_internal(gfp_t gfp_mask, u
int alloc_flags;
unsigned long did_some_progress;
unsigned long pages_reclaimed = 0;
+ struct zonelist *zonelist;
might_sleep_if(wait);
@@ -1534,6 +1536,7 @@ __alloc_pages_internal(gfp_t gfp_mask, u
return NULL;
restart:
+ zonelist = node_zonelist(zonelist_nid, gfp_mask);;
z = zonelist->_zonerefs; /* the list of zones suitable for gfp_mask */
if (unlikely(!z->zone)) {
@@ -1545,7 +1548,9 @@ restart:
}
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
- zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET);
+ zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET,
+ zonelist_nid);
+
if (page)
goto got_pg;
@@ -1590,7 +1595,7 @@ restart:
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.
*/
page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
- high_zoneidx, alloc_flags);
+ high_zoneidx, alloc_flags, zonelist_nid);
if (page)
goto got_pg;
@@ -1603,7 +1608,8 @@ rebalance:
nofail_alloc:
/* go through the zonelist yet again, ignoring mins */
page = get_page_from_freelist(gfp_mask, nodemask, order,
- zonelist, high_zoneidx, ALLOC_NO_WATERMARKS);
+ zonelist, high_zoneidx, ALLOC_NO_WATERMARKS,
+ zonelist_nid);
if (page)
goto got_pg;
if (gfp_mask & __GFP_NOFAIL) {
@@ -1638,7 +1644,8 @@ nofail_alloc:
if (likely(did_some_progress)) {
page = get_page_from_freelist(gfp_mask, nodemask, order,
- zonelist, high_zoneidx, alloc_flags);
+ zonelist, high_zoneidx, alloc_flags,
+ zonelist_nid);
if (page)
goto got_pg;
} else if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
@@ -1655,7 +1662,7 @@ nofail_alloc:
*/
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
order, zonelist, high_zoneidx,
- ALLOC_WMARK_HIGH|ALLOC_CPUSET);
+ ALLOC_WMARK_HIGH|ALLOC_CPUSET, zonelist_nid);
if (page) {
clear_zonelist_oom(zonelist, gfp_mask);
goto got_pg;
Index: current/mm/hugetlb.c
===================================================================
--- current.orig/mm/hugetlb.c 2008-07-31 18:54:09.000000000 +0900
+++ current/mm/hugetlb.c 2008-07-31 18:54:18.000000000 +0900
@@ -411,8 +411,9 @@ static struct page *dequeue_huge_page_vm
struct page *page = NULL;
struct mempolicy *mpol;
nodemask_t *nodemask;
- struct zonelist *zonelist = huge_zonelist(vma, address,
+ int zonelist_nid = huge_node(vma, address,
htlb_alloc_mask, &mpol, &nodemask);
+ struct zonelist *zonelist;
struct zone *zone;
struct zoneref *z;
@@ -429,6 +430,7 @@ static struct page *dequeue_huge_page_vm
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
return NULL;
+ zonelist = node_zonelist(zonelist_nid, htlb_alloc_mask);
for_each_zone_zonelist_nodemask(zone, z, zonelist,
MAX_NR_ZONES - 1, nodemask) {
nid = zone_to_nid(zone);
Index: current/include/linux/mempolicy.h
===================================================================
--- current.orig/include/linux/mempolicy.h 2008-07-31 18:54:09.000000000 +0900
+++ current/include/linux/mempolicy.h 2008-07-31 18:54:18.000000000 +0900
@@ -197,7 +197,7 @@ extern void mpol_rebind_task(struct task
extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
extern void mpol_fix_fork_child_flag(struct task_struct *p);
-extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
+extern int huge_node(struct vm_area_struct *vma,
unsigned long addr, gfp_t gfp_flags,
struct mempolicy **mpol, nodemask_t **nodemask);
extern unsigned slab_node(struct mempolicy *policy);
--
Yasunori Goto
--
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