From: Xueyuan Chen <[email protected]>
zs_shrinker_scan() currently calls zs_compact(), which compacts the whole
pool regardless of sc->nr_to_scan. A single shrinker callback can therefore
reclaim much more than requested and spend a long time in compaction.
On an Android device with 12 GB of RAM, observed zsmalloc compaction
durations had a p95 of 38.86 ms and a maximum of 269.68 ms, motivating a
per-scan reclaim goal.
This series uses sc->nr_to_scan as a reclaimed-page goal and keeps a
per-pool size-class cursor so later scans resume where the previous scan
stopped. The existing full-pool behavior of zs_compact() is unchanged.
Xueyuan Chen (2):
mm: zsmalloc: add a page limit to pool compaction
mm: zsmalloc: use the shrinker reclaim budget
mm/zsmalloc.c | 46 +++++++++++++++++++++++++++++++---------------
1 file changed, 31 insertions(+), 15 deletions(-)
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2.47.3
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