linux-kernel - Re: [PATCH 01/10] memcg: add page_cgroup flags for dirty page tracking

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Message-ID: <20101006110739.GB4195@balbir.in.ibm.com>
Date:	Wed, 6 Oct 2010 16:37:39 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, Andrea Righi <arighi@...eler.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 01/10] memcg: add page_cgroup flags for dirty page
 tracking

* Greg Thelen <gthelen@...gle.com> [2010-10-03 23:57:56]:

> Add additional flags to page_cgroup to track dirty pages
> within a mem_cgroup.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Andrea Righi <arighi@...eler.com>
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> ---
>  include/linux/page_cgroup.h |   23 +++++++++++++++++++++++
>  1 files changed, 23 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
> index 5bb13b3..b59c298 100644
> --- a/include/linux/page_cgroup.h
> +++ b/include/linux/page_cgroup.h
> @@ -40,6 +40,9 @@ enum {
>  	PCG_USED, /* this object is in use. */
>  	PCG_ACCT_LRU, /* page has been accounted for */
>  	PCG_FILE_MAPPED, /* page is accounted as "mapped" */
> +	PCG_FILE_DIRTY, /* page is dirty */
> +	PCG_FILE_WRITEBACK, /* page is under writeback */
> +	PCG_FILE_UNSTABLE_NFS, /* page is NFS unstable */
>  	PCG_MIGRATION, /* under page migration */
>  };
> 
> @@ -59,6 +62,10 @@ static inline void ClearPageCgroup##uname(struct page_cgroup *pc)	\
>  static inline int TestClearPageCgroup##uname(struct page_cgroup *pc)	\
>  	{ return test_and_clear_bit(PCG_##lname, &pc->flags);  }
> 
> +#define TESTSETPCGFLAG(uname, lname)			\
> +static inline int TestSetPageCgroup##uname(struct page_cgroup *pc)	\
> +	{ return test_and_set_bit(PCG_##lname, &pc->flags);  }
> +
>  TESTPCGFLAG(Locked, LOCK)
> 
>  /* Cache flag is set only once (at allocation) */
> @@ -80,6 +87,22 @@ SETPCGFLAG(FileMapped, FILE_MAPPED)
>  CLEARPCGFLAG(FileMapped, FILE_MAPPED)
>  TESTPCGFLAG(FileMapped, FILE_MAPPED)
> 
> +SETPCGFLAG(FileDirty, FILE_DIRTY)
> +CLEARPCGFLAG(FileDirty, FILE_DIRTY)
> +TESTPCGFLAG(FileDirty, FILE_DIRTY)
> +TESTCLEARPCGFLAG(FileDirty, FILE_DIRTY)
> +TESTSETPCGFLAG(FileDirty, FILE_DIRTY)
> +
> +SETPCGFLAG(FileWriteback, FILE_WRITEBACK)
> +CLEARPCGFLAG(FileWriteback, FILE_WRITEBACK)
> +TESTPCGFLAG(FileWriteback, FILE_WRITEBACK)
> +
> +SETPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
> +CLEARPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
> +TESTPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
> +TESTCLEARPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
> +TESTSETPCGFLAG(FileUnstableNFS, FILE_UNSTABLE_NFS)
> +
>  SETPCGFLAG(Migration, MIGRATION)
>  CLEARPCGFLAG(Migration, MIGRATION)
>  TESTPCGFLAG(Migration, MIGRATION)

Looks good to me


Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 

-- 
	Three Cheers,
	Balbir
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