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| author | Dennis Zhou | 2019-02-13 20:10:30 +0100 |
|---|---|---|
| committer | Dennis Zhou | 2019-03-13 20:25:31 +0100 |
| commit | b239f7daf5530f562000bf55f02cc8028703f507 (patch) | |
| tree | 699b64a042de071ada97dc59288d1882181b64b9 /mm/percpu-internal.h | |
| parent | percpu: relegate chunks unusable when failing small allocations (diff) | |
| download | kernel-qcow2-linux-b239f7daf5530f562000bf55f02cc8028703f507.tar.gz kernel-qcow2-linux-b239f7daf5530f562000bf55f02cc8028703f507.tar.xz kernel-qcow2-linux-b239f7daf5530f562000bf55f02cc8028703f507.zip | |
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-internal.h')
0 files changed, 0 insertions, 0 deletions