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>

...

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Imran Khan 2026-06-04 21:42:45 +08:00 • committed by Andrew Morton

parent a4519e5b64

commit aaa98b100e

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mm/vmstat.c

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