mm/percpu: add comment to state the empty populated pages accounting

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When allocating an area from a chunk, pcpu_block_update_hint_alloc()
is called to update chunk metadata, including chunk's and global
nr_empty_pop_pages. However, if the allocation is not atomic, some
blocks may not be populated with pages yet, while we still subtract
the number here. The number of pages will be added back with
pcpu_chunk_populated() when populating pages.

Adding code comment to make that more understandable.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>

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Baoquan He 2022-10-25 11:45:16 +08:00 • committed by Dennis Zhou

parent e04cb69763

commit 73046f8d31

1 changed files with 11 additions and 3 deletions

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mm/percpu.c

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