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authorDennis Zhou <dennis@kernel.org>2019-02-13 22:10:30 +0300
committerDennis Zhou <dennis@kernel.org>2019-03-13 22:25:31 +0300
commitb239f7daf5530f562000bf55f02cc8028703f507 (patch)
tree699b64a042de071ada97dc59288d1882181b64b9 /mm/percpu-km.c
parent8744d859427c6198dce490619809754336954297 (diff)
downloadlinux-b239f7daf5530f562000bf55f02cc8028703f507.tar.xz
percpu: set PCPU_BITMAP_BLOCK_SIZE to PAGE_SIZE
Previously, block size was flexible based on the constraint that the GCD(PCPU_BITMAP_BLOCK_SIZE, PAGE_SIZE) > 1. However, this carried the overhead that keeping a floating number of populated free pages required scanning over the free regions of a chunk. Setting the block size to be fixed at PAGE_SIZE lets us know when an empty page becomes used as we will break a full contig_hint of a block. This means we no longer have to scan the whole chunk upon breaking a contig_hint which empty page management piggybacked off. A later patch takes advantage of this to optimize the allocation path by only scanning forward using the scan_hint introduced later too. Signed-off-by: Dennis Zhou <dennis@kernel.org> Reviewed-by: Peng Fan <peng.fan@nxp.com>
Diffstat (limited to 'mm/percpu-km.c')
-rw-r--r--mm/percpu-km.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/percpu-km.c b/mm/percpu-km.c
index b68d5df14731..3a2ff5c9192c 100644
--- a/mm/percpu-km.c
+++ b/mm/percpu-km.c
@@ -70,7 +70,7 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
chunk->base_addr = page_address(pages);
spin_lock_irqsave(&pcpu_lock, flags);
- pcpu_chunk_populated(chunk, 0, nr_pages, false);
+ pcpu_chunk_populated(chunk, 0, nr_pages);
spin_unlock_irqrestore(&pcpu_lock, flags);
pcpu_stats_chunk_alloc();