Messages in this thread | | | From | Sergey Senozhatsky <> | Subject | [RFC][PATCH 00/10] zsmalloc auto-compaction | Date | Sat, 30 May 2015 00:05:18 +0900 |
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Hello,
RFC
this is 4.3 material, but I wanted to publish it sooner to gain responses and to settle it down before 4.3 merge window opens.
in short, this series tweaks zsmalloc's compaction and adds auto-compaction support. auto-compaction is not aimed to replace manual compaction, intead it's supposed to be good enough. yet it surely slows down zsmalloc in some scenarious. whilst simple un-tar test didn't show any significant performance difference
quote from commit 0007:
this test copies a 1.3G linux kernel tar to mounted zram disk, and extracts it.
w/auto-compaction:
cat /sys/block/zram0/mm_stat 1171456 26006 86016 0 86016 32781 0
time tar xf linux-3.10.tar.gz -C linux
real 0m16.970s user 0m15.247s sys 0m8.477s
du -sh linux 2.0G linux
cat /sys/block/zram0/mm_stat 3547353088 2993384270 3011088384 0 3011088384 24310 108
=====================================================================
w/o auto compaction:
cat /sys/block/zram0/mm_stat 1171456 26000 81920 0 81920 32781 0
time tar xf linux-3.10.tar.gz -C linux
real 0m16.983s user 0m15.267s sys 0m8.417s
du -sh linux 2.0G linux
cat /sys/block/zram0/mm_stat 3548917760 2993566924 3011317760 0 3011317760 23928 0
Sergey Senozhatsky (10): zsmalloc: drop unused variable `nr_to_migrate' zsmalloc: always keep per-class stats zsmalloc: introduce zs_can_compact() function zsmalloc: cosmetic compaction code adjustments zsmalloc: add `num_migrated' to zs_pool zsmalloc: move compaction functions zsmalloc: introduce auto-compact support zsmalloc: export zs_pool `num_migrated' zram: remove `num_migrated' from zram_stats zsmalloc: lower ZS_ALMOST_FULL waterline
drivers/block/zram/zram_drv.c | 12 +- drivers/block/zram/zram_drv.h | 1 - include/linux/zsmalloc.h | 1 + mm/zsmalloc.c | 578 +++++++++++++++++++++--------------------- 4 files changed, 296 insertions(+), 296 deletions(-)
-- 2.4.2.337.gfae46aa
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