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Message-ID: <20180718141150.imiyuust5txfmfvw@xakep.localdomain>
Date: Wed, 18 Jul 2018 10:11:50 -0400
From: Pavel Tatashin <pasha.tatashin@...cle.com>
To: osalvador@...hadventures.net
Cc: akpm@...ux-foundation.org, mhocko@...e.com, vbabka@...e.cz,
iamjoonsoo.kim@....com, aaron.lu@...el.com,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH 1/3] mm/page_alloc: Move ifdefery out of
free_area_init_core
On 18-07-18 14:47:20, osalvador@...hadventures.net wrote:
> From: Oscar Salvador <osalvador@...e.de>
>
> Moving the #ifdefs out of the function makes it easier to follow.
>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
Hi Oscar,
Reviewed-by: Pavel Tatashin <pasha.tatashin@...cle.com>
Please include the following patch in your series, to get rid of the last
ifdef in this function.
>From f841184e141b21e79c4d017d3b7678c697016d2a Mon Sep 17 00:00:00 2001
From: Pavel Tatashin <pasha.tatashin@...cle.com>
Date: Wed, 18 Jul 2018 09:56:52 -0400
Subject: [PATCH] mm: access zone->node via zone_to_nid() and zone_set_nid()
zone->node is configured only when CONFIG_NUMA=y, so it is a good idea to
have inline functions to access this field in order to avoid ifdef's in
c files.
Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
include/linux/mm.h | 9 ---------
include/linux/mmzone.h | 26 ++++++++++++++++++++------
mm/mempolicy.c | 4 ++--
mm/mm_init.c | 9 ++-------
mm/page_alloc.c | 10 ++++------
5 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3982c83fdcbf..8634eeafad0b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -940,15 +940,6 @@ static inline int page_zone_id(struct page *page)
return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
}
-static inline int zone_to_nid(struct zone *zone)
-{
-#ifdef CONFIG_NUMA
- return zone->node;
-#else
- return 0;
-#endif
-}
-
#ifdef NODE_NOT_IN_PAGE_FLAGS
extern int page_to_nid(const struct page *page);
#else
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 32699b2dc52a..aeb6c1499da5 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -841,6 +841,25 @@ static inline bool populated_zone(struct zone *zone)
return zone->present_pages;
}
+#ifdef CONFIG_NUMA
+static inline int zone_to_nid(struct zone *zone)
+{
+ return zone->node;
+}
+
+static inline void zone_set_nid(struct zone *zone, int nid)
+{
+ zone->node = nid;
+}
+#else
+static inline int zone_to_nid(struct zone *zone)
+{
+ return 0;
+}
+
+static inline void zone_set_nid(struct zone *zone, int nid) {}
+#endif
+
extern int movable_zone;
#ifdef CONFIG_HIGHMEM
@@ -956,12 +975,7 @@ static inline int zonelist_zone_idx(struct zoneref *zoneref)
static inline int zonelist_node_idx(struct zoneref *zoneref)
{
-#ifdef CONFIG_NUMA
- /* zone_to_nid not available in this context */
- return zoneref->zone->node;
-#else
- return 0;
-#endif /* CONFIG_NUMA */
+ return zone_to_nid(zoneref->zone);
}
struct zoneref *__next_zones_zonelist(struct zoneref *z,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 9ac49ef17b4e..9cfccb54d207 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1784,7 +1784,7 @@ unsigned int mempolicy_slab_node(void)
zonelist = &NODE_DATA(node)->node_zonelists[ZONELIST_FALLBACK];
z = first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes);
- return z->zone ? z->zone->node : node;
+ return z->zone ? zone_to_nid(z->zone) : node;
}
default:
@@ -2326,7 +2326,7 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
node_zonelist(numa_node_id(), GFP_HIGHUSER),
gfp_zone(GFP_HIGHUSER),
&pol->v.nodes);
- polnid = z->zone->node;
+ polnid = zone_to_nid(z->zone);
break;
default:
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 5b72266b4b03..6838a530789b 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -53,13 +53,8 @@ void __init mminit_verify_zonelist(void)
zone->name);
/* Iterate the zonelist */
- for_each_zone_zonelist(zone, z, zonelist, zoneid) {
-#ifdef CONFIG_NUMA
- pr_cont("%d:%s ", zone->node, zone->name);
-#else
- pr_cont("0:%s ", zone->name);
-#endif /* CONFIG_NUMA */
- }
+ for_each_zone_zonelist(zone, z, zonelist, zoneid)
+ pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
pr_cont("\n");
}
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 790722afa7cf..dbce6c0ced74 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2908,10 +2908,10 @@ static inline void zone_statistics(struct zone *preferred_zone, struct zone *z)
if (!static_branch_likely(&vm_numa_stat_key))
return;
- if (z->node != numa_node_id())
+ if (zone_to_nid(z) != numa_node_id())
local_stat = NUMA_OTHER;
- if (z->node == preferred_zone->node)
+ if (zone_to_nid(z) == zone_to_nid(preferred_zone))
__inc_numa_state(z, NUMA_HIT);
else {
__inc_numa_state(z, NUMA_MISS);
@@ -5280,7 +5280,7 @@ int local_memory_node(int node)
z = first_zones_zonelist(node_zonelist(node, GFP_KERNEL),
gfp_zone(GFP_KERNEL),
NULL);
- return z->zone->node;
+ return zone_to_nid(z->zone);
}
#endif
@@ -6302,9 +6302,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
* And all highmem pages will be managed by the buddy system.
*/
zone->managed_pages = freesize;
-#ifdef CONFIG_NUMA
- zone->node = nid;
-#endif
+ zone_set_nid(nid);
zone->name = zone_names[j];
zone->zone_pgdat = pgdat;
spin_lock_init(&zone->lock);
--
2.18.0
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