linux-kernel - Re: [PATCH 0/3] Per cgroup swap file support

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Message-ID: <20140322154324.GK4407@cmpxchg.org>
Date:	Sat, 22 Mar 2014 11:43:24 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Yu Zhao <yuzhao@...gle.com>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	jamieliu@...gle.com, suleiman@...gle.com
Subject: Re: [PATCH 0/3] Per cgroup swap file support

Hello Yu!

On Fri, Mar 21, 2014 at 03:50:31PM -0700, Yu Zhao wrote:
> This series of patches adds support to configure a cgroup to swap to a
> particular file by using control file memory.swapfile.
> 
> A value of "default" in memory.swapfile indicates that this cgroup should
> use the default, system-wide, swap files. A value of "none" indicates that
> this cgroup should never swap. Other values are interpreted as the path
> to a private swap file that can only be used by the owner (and its children).
> 
> The swap file has to be created and swapon() has to be done on it with
> SWAP_FLAG_PRIVATE, before it can be used. This flag ensures that the swap
> file is private and does not get used by others.
> 
> Jamie Liu (1):
>   swap: do not store private swap files on swap_list
> 
> Suleiman Souhlal (2):
>   mm/swap: support per memory cgroup swapfiles
>   swap: Increase the maximum number of swap files to 8192.
> 
>  Documentation/cgroups/memory.txt  |  15 ++
>  arch/x86/include/asm/pgtable_64.h |  63 ++++++--
>  include/linux/memcontrol.h        |   2 +
>  include/linux/swap.h              |  45 +++---
>  mm/memcontrol.c                   |  76 ++++++++++
>  mm/memory.c                       |   3 +-
>  mm/shmem.c                        |   2 +-
>  mm/swap_state.c                   |   2 +-
>  mm/swapfile.c                     | 307 +++++++++++++++++++++++++++++++-------
>  mm/vmscan.c                       |   2 +-
>  10 files changed, 423 insertions(+), 94 deletions(-)

For feature patches like this, please include a rationale.  What is
this functionality good for, and who is going to use this?
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