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Date: Thu, 19 Jul 2018 15:40:18 +0200
From: Michal Hocko <mhocko@...nel.org>
To: osalvador@...hadventures.net
Cc: akpm@...ux-foundation.org, pasha.tatashin@...cle.com,
vbabka@...e.cz, aaron.lu@...el.com, iamjoonsoo.kim@....com,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 2/5] mm: access zone->node via zone_to_nid() and
zone_set_nid()
On Thu 19-07-18 15:27:37, osalvador@...hadventures.net wrote:
> From: Pavel Tatashin <pasha.tatashin@...cle.com>
>
> 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.
Is this a manual find & replace or did you use some scripts?
The change makes sense, but I haven't checked that all the places are
replaced properly. If not we can replace them later.
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>
Acked-by: Michal Hocko <mhocko@...e.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 726e71475144..6954ad183159 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 ae1a034c3e2c..17fdff3bfb41 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -842,6 +842,25 @@ 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
> @@ -957,12 +976,7 @@ 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 f0fcf70bcec7..8c1c09b3852a 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 8a73305f7c55..10b754fba5fa 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2909,10 +2909,10 @@ 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);
> @@ -5287,7 +5287,7 @@ 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
>
> @@ -6311,9 +6311,7 @@ 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(zone, nid);
> zone->name = zone_names[j];
> zone->zone_pgdat = pgdat;
> spin_lock_init(&zone->lock);
> --
> 2.13.6
>
--
Michal Hocko
SUSE Labs
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