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mm/page_owner: simplify zone iteration logic in init_early_allocated_pages() 

The current implementation uses nested loops: first iterating over all
online nodes, then over zones within each node.  This can be simplified by
using the for_each_populated_zone() macro which directly iterates through
all populated zones.

This change:
1. Removes the intermediate init_zones_in_node() function
2. Simplifies init_early_allocated_pages() to use direct zone iteration
3. Updates init_pages_in_zone() to take only zone parameter and access
   node_id via zone->zone_pgdat

The functionality remains identical, but the code is cleaner and more
maintainable.

Link: https://lkml.kernel.org/r/20250930092153.843109-2-husong@kylinos.cn
Signed-off-by: Song Hu <husong@kylinos.cn>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Ye Liu <liuye@kylinos.cn>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Song Hu 2025-09-30 17:21:52 +08:00 committed by Andrew Morton
parent 9686080d62
commit ca30ac479e
1 changed files with 5 additions and 18 deletions
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23
mm/page_owner.c
View File

@ -769,7 +769,7 @@ static loff_t lseek_page_owner(struct file *file, loff_t offset, int orig)
return file->f_pos; return file->f_pos;
} }
static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) static void init_pages_in_zone(struct zone *zone)
{ {
unsigned long pfn = zone->zone_start_pfn; unsigned long pfn = zone->zone_start_pfn;
unsigned long end_pfn = zone_end_pfn(zone); unsigned long end_pfn = zone_end_pfn(zone);
@ -836,28 +836,15 @@ static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone)
} }
pr_info("Node %d, zone %8s: page owner found early allocated %lu pages\n", pr_info("Node %d, zone %8s: page owner found early allocated %lu pages\n",
pgdat->node_id, zone->name, count); zone->zone_pgdat->node_id, zone->name, count);
}
static void init_zones_in_node(pg_data_t *pgdat)
{
struct zone *zone;
struct zone *node_zones = pgdat->node_zones;
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
if (!populated_zone(zone))
continue;
init_pages_in_zone(pgdat, zone);
}
} }
static void init_early_allocated_pages(void) static void init_early_allocated_pages(void)
{ {
pg_data_t *pgdat; struct zone *zone;
for_each_online_pgdat(pgdat) for_each_populated_zone(zone)
init_zones_in_node(pgdat); init_pages_in_zone(zone);
} }
static const struct file_operations page_owner_fops = { static const struct file_operations page_owner_fops = {