[RFC][PATCH v3 0/7] introduce automatic pool compaction

Sergey Senozhatsky
2015-06-18T11:47:41Z

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.

v3:
-- drop almost_empty waterline adjustment patch (Minchan)
-- do not hold class->lock for the entire compaction period (Minchan)

v2:
-- use a slab shrinker instead of triggering compaction from zs_free (Minchan)

Sergey Senozhatsky (7):
zsmalloc: drop unused variable `nr_to_migrate'
zsmalloc: partial page ordering within a fullness_list
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 | 220 +++++++++++++++++++++++++++---------------
4 files changed, 150 insertions(+), 84 deletions(-)

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2.4.4