From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: [RFC][PATCHv2 0/8] introduce automatic pool compaction
Date: Fri, 5 Jun 2015 21:03:50 +0900 [thread overview]
Message-ID: <1433505838-23058-1-git-send-email-sergey.senozhatsky@gmail.com> (raw)
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
WARNING: multiple messages have this Message-ID (diff)
From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Minchan Kim <minchan@kernel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: [RFC][PATCHv2 0/8] introduce automatic pool compaction
Date: Fri, 5 Jun 2015 21:03:50 +0900 [thread overview]
Message-ID: <1433505838-23058-1-git-send-email-sergey.senozhatsky@gmail.com> (raw)
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
--
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next reply other threads:[~2015-06-05 12:04 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-05 12:03 Sergey Senozhatsky [this message]
2015-06-05 12:03 ` [RFC][PATCHv2 0/8] introduce automatic pool compaction Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 1/8] zsmalloc: drop unused variable `nr_to_migrate' Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 2/8] zsmalloc: partial page ordering within a fullness_list Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-16 13:19 ` Minchan Kim
2015-06-16 13:19 ` Minchan Kim
2015-06-16 14:30 ` Sergey Senozhatsky
2015-06-16 14:30 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 3/8] zsmalloc: lower ZS_ALMOST_FULL waterline Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-16 13:37 ` Minchan Kim
2015-06-16 13:37 ` Minchan Kim
2015-06-16 14:35 ` Sergey Senozhatsky
2015-06-16 14:35 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 4/8] zsmalloc: always keep per-class stats Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 5/8] zsmalloc: introduce zs_can_compact() function Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-16 14:19 ` Minchan Kim
2015-06-16 14:19 ` Minchan Kim
2015-06-16 14:41 ` Sergey Senozhatsky
2015-06-16 14:41 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 6/8] zsmalloc: cosmetic compaction code adjustments Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 7/8] zsmalloc/zram: move `num_migrated' to zs_pool Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-05 12:03 ` [RFC][PATCHv2 8/8] zsmalloc: register a shrinker to trigger auto-compaction Sergey Senozhatsky
2015-06-05 12:03 ` Sergey Senozhatsky
2015-06-16 14:47 ` Minchan Kim
2015-06-16 14:47 ` Minchan Kim
2015-06-16 15:45 ` Sergey Senozhatsky
2015-06-16 15:45 ` Sergey Senozhatsky
2015-06-18 1:50 ` Minchan Kim
2015-06-18 1:50 ` Minchan Kim
2015-06-18 2:41 ` Sergey Senozhatsky
2015-06-18 2:41 ` Sergey Senozhatsky
2015-06-18 3:01 ` Sergey Senozhatsky
2015-06-18 3:01 ` Sergey Senozhatsky
2015-06-18 3:46 ` Minchan Kim
2015-06-18 3:46 ` Minchan Kim
2015-06-18 3:39 ` Minchan Kim
2015-06-18 3:39 ` Minchan Kim
2015-06-18 3:58 ` Sergey Senozhatsky
2015-06-18 3:58 ` Sergey Senozhatsky
2015-06-17 7:11 ` Sergey Senozhatsky
2015-06-17 7:11 ` Sergey Senozhatsky
2015-06-10 0:04 ` [RFC][PATCHv2 0/8] introduce automatic pool compaction Minchan Kim
2015-06-10 0:04 ` Minchan Kim
2015-06-10 0:07 ` Sergey Senozhatsky
2015-06-10 0:07 ` Sergey Senozhatsky
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