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mm/vmstat: avoid taking zone lock in /proc/buddyinfo reads

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frag_show_print() just reads zone->free_area[order].nr_free, so it can
safely do this without needing the zone->lock.

Pass nolock=true from frag_show(), so that walk_zones_in_node() can skip
the zone->lock acquisition.

Link: https://lore.kernel.org/20260604134245.1580287-1-imran.f.khan@oracle.com
Signed-off-by: Imran Khan <imran.f.khan@oracle.com>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Imran Khan
2026-07-28 21:12:05 -07:00
committed by Andrew Morton
parent a4519e5b64
commit aaa98b100e
1 changed files with 1 additions and 1 deletions
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mm/vmstat.c
+1 -1
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@@ -1568,7 +1568,7 @@ static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
static int frag_show(struct seq_file *m, void *arg)
{
pg_data_t *pgdat = (pg_data_t *)arg;
walk_zones_in_node(m, pgdat, true, false, frag_show_print);
walk_zones_in_node(m, pgdat, true, true, frag_show_print);
return 0;
}