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percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated

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pcpu_nr_empty_pop_pages counts the number of empty populated pages
across all chunks and chunk->nr_populated counts the number of
populated pages in a chunk.  Both will be used to implement pre/async
population for atomic allocations.

pcpu_chunk_[de]populated() are added to update chunk->populated,
chunk->nr_populated and pcpu_nr_empty_pop_pages together.  All
successful chunk [de]populations should be followed by the
corresponding pcpu_chunk_[de]populated() calls.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2014-09-02 14:46:05 -04:00
parent 9c824b6a17
commit b539b87fed
2 changed files with 114 additions and 10 deletions
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2
mm/percpu-km.c
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@ -69,7 +69,7 @@ static struct pcpu_chunk *pcpu_create_chunk(void)
chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
spin_lock_irq(&pcpu_lock);
bitmap_fill(chunk->populated, nr_pages);
pcpu_chunk_populated(chunk, 0, nr_pages);
spin_unlock_irq(&pcpu_lock);
return chunk;