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Message-ID: <20141202030408.GA21257@bbox>
Date: Tue, 2 Dec 2014 12:04:08 +0900
From: Minchan Kim <minchan@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>,
Jerome Marchand <jmarchan@...hat.com>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Dan Streetman <ddstreet@...e.org>,
Nitin Gupta <ngupta@...are.org>,
Luigi Semenzato <semenzato@...gle.com>, juno.choi@....com
Subject: Re: [PATCH v1 0/5] stop anon reclaim when zram is full
Hello all,
On Mon, Sep 22, 2014 at 09:03:06AM +0900, Minchan Kim wrote:
> For zram-swap, there is size gap between virtual disksize
> and available physical memory size for zram so that VM
> can try to reclaim anonymous pages even though zram is full.
> It makes system alomost hang(ie, unresponsible) easily in
> my kernel build test(ie, 1G DRAM, CPU 12, 4G zram swap,
> 50M zram limit). VM should have killed someone.
>
> This patch adds new hint SWAP_FULL so VM can ask fullness
> to zram and if it founds zram is full, VM doesn't reclaim
> anonymous pages until zram-swap gets new free space.
>
> With this patch, I see OOM when zram-swap is full instead of
> hang with no response.
>
> Minchan Kim (5):
> zram: generalize swap_slot_free_notify
> mm: add full variable in swap_info_struct
> mm: VM can be aware of zram fullness
> zram: add swap full hint
> zram: add fullness knob to control swap full
I'm sorry for long delay for this patch althogh you guys gave great
feedback to me.
The reason I was hesitant about this patchset is that I want to avoid
weird fullness knob which was introduced by zsmalloc's internal limit.
So, before this feature, I hope we get zsmalloc's compaction firstly
Then, I hope to remove fullness knob totally.
Thanks.
>
> Documentation/ABI/testing/sysfs-block-zram | 10 +++
> Documentation/filesystems/Locking | 4 +-
> drivers/block/zram/zram_drv.c | 114 +++++++++++++++++++++++++++--
> drivers/block/zram/zram_drv.h | 2 +
> include/linux/blkdev.h | 8 +-
> include/linux/swap.h | 1 +
> mm/page_io.c | 6 +-
> mm/swapfile.c | 77 ++++++++++++++-----
> 8 files changed, 189 insertions(+), 33 deletions(-)
>
> --
> 2.0.0
>
> --
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--
Kind regards,
Minchan Kim
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