Hello Sergey, Thanks for looking this and sorry for the delay for review. I don't have a time to hold a review yet. Please wait and I try to get a time within this week. Thanks for your patience. On Fri, Jun 05, 2015 at 09:03:50PM +0900, Sergey Senozhatsky wrote: > Hello, > > This patch set tweaks compaction and makes it possible to trigger > pool compaction automatically when system is getting low on memory. > > zsmalloc in some cases can suffer from a notable fragmentation and > compaction can release some considerable amount of memory. The problem > here is that currently we fully rely on user space to perform compaction > when needed. However, performing zsmalloc compaction is not always an > obvious thing to do. For example, suppose we have a `idle' fragmented > (compaction was never performed) zram device and system is getting low > on memory due to some 3rd party user processes (gcc LTO, or firefox, etc.). > It's quite unlikely that user space will issue zpool compaction in this > case. Besides, user space cannot tell for sure how badly pool is > fragmented; however, this info is known to zsmalloc and, hence, to a > shrinker. > > v2: > -- use a slab shrinker instead of triggering compaction from zs_free (Minchan) > > Sergey Senozhatsky (8): > zsmalloc: drop unused variable `nr_to_migrate' > zsmalloc: partial page ordering within a fullness_list > zsmalloc: lower ZS_ALMOST_FULL waterline > zsmalloc: always keep per-class stats > zsmalloc: introduce zs_can_compact() function > zsmalloc: cosmetic compaction code adjustments > zsmalloc/zram: move `num_migrated' to zs_pool > zsmalloc: register a shrinker to trigger auto-compaction > > drivers/block/zram/zram_drv.c | 12 +-- > drivers/block/zram/zram_drv.h | 1 - > include/linux/zsmalloc.h | 1 + > mm/zsmalloc.c | 228 +++++++++++++++++++++++++++--------------- > 4 files changed, 152 insertions(+), 90 deletions(-) > > -- > 2.4.2.387.gf86f31a > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>