On Thu, Mar 14, 2024 at 03:19:45PM +0800, Baolin Wang wrote:
>
>
> On 2024/3/14 08:54, Luis Chamberlain wrote:
> > We can just wrap most of the work done on fragmentation_score_node()
> > into a pgdat helper for populated zones. Add the helper and use it.
> >
> > Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
> > ---
> > include/linux/mmzone.h | 8 ++++++++
> > mm/compaction.c | 9 ++-------
> > 2 files changed, 10 insertions(+), 7 deletions(-)
> >
> > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> > index a497f189d988..1fd74c7100ec 100644
> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -1597,6 +1597,14 @@ extern struct zone *next_zone(struct zone *zone);
> > ; /* do nothing */ \
> > else
> > +#define for_each_populated_zone_pgdat(zone, pgdat) \
> > + for (zone = pgdat->node_zones; \
> > + zone; \
> > + zone = next_zone(zone)) \
> > + if (!populated_zone(zone)) \
> > + ; /* do nothing */ \
> > + else
>
> I think this will break the original logics, since the next_zone() will
> iterate over all memory zones, instead of only the memory zones of the
> specified node.
Definitely, thanks, so we'd need something like this in addition:
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 34b729fc751b..bd11d33ea14d 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1568,6 +1568,7 @@ static inline struct pglist_data *NODE_DATA(int nid)
extern struct pglist_data *first_online_pgdat(void);
extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
extern struct zone *next_zone(struct zone *zone);
+extern struct zone *next_zone_pgdat(struct zone *zone, struct pglist_data *pgdat);
/**
* for_each_online_pgdat - helper macro to iterate over all online nodes
@@ -1600,7 +1601,7 @@ extern struct zone *next_zone(struct zone *zone);
#define for_each_populated_zone_pgdat(zone, pgdat) \
for (zone = pgdat->node_zones; \
zone; \
- zone = next_zone(zone)) \
+ zone = next_zone_pgdat(zone, pgdat)) \
if (!populated_zone(zone)) \
; /* do nothing */ \
else
diff --git a/mm/compaction.c b/mm/compaction.c
index 015126803017..96434f6fc1ad 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2152,7 +2152,6 @@ static unsigned int fragmentation_score_node(pg_data_t *pgdat)
{
unsigned int score = 0;
struct zone *zone;
- int zoneid;
for_each_populated_zone_pgdat(zone, pgdat)
score += fragmentation_score_zone_weighted(zone);
diff --git a/mm/mmzone.c b/mm/mmzone.c
index c01896eca736..043a6dc16c05 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -43,6 +43,18 @@ struct zone *next_zone(struct zone *zone)
return zone;
}
+/*
+ * next_zone_pgdat - helper magic for for_each_zone() per node
+ */
+struct zone *next_zone_pgdat(struct zone *zone, struct pglist_data *pgdat)
+{
+ if (!zone || !pgdat)
+ return NULL;
+ if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
+ return ++zone;
+ return NULL;
+}
+
static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes)
{
#ifdef CONFIG_NUMA
