linux-kernel - Re: [PATCH -mmotm 3/3] memcg: dirty pages instrumentation

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Message-ID: <20100302152600.GA16532@balbir.in.ibm.com>
Date:	Tue, 2 Mar 2010 20:56:00 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrea Righi <arighi@...eler.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Trond Myklebust <trond.myklebust@....uio.no>
Subject: Re: [PATCH -mmotm 3/3] memcg: dirty pages instrumentation

* Peter Zijlstra <peterz@...radead.org> [2010-03-02 14:48:56]:

> This is ugly and broken.. I thought you'd agreed to something like:
> 
>  if (mem_cgroup_has_dirty_limit(cgroup))
>    use mem_cgroup numbers
>  else
>    use global numbers
> 
> That allows for a 0 dirty limit (which should work and basically makes
> all io synchronous).
> 
> Also, I'd put each of those in a separate function, like:
> 
> unsigned long reclaimable_pages(cgroup)
> {
>   if (mem_cgroup_has_dirty_limit(cgroup))
>     return mem_cgroup_page_stat(MEMCG_NR_RECLAIM_PAGES);
>   
>   return global_page_state(NR_FILE_DIRTY) + global_page_state(NR_NFS_UNSTABLE);
> }
>

I agree, I should have been more specific about the naming convention,
this is what I meant - along these lines as we do with
zone_nr_lru_pages(), etc.
 
> Which raises another question, you should probably rebase on top of
> Trond's patches, which removes BDI_RECLAIMABLE, suggesting you also
> loose MEMCG_NR_RECLAIM_PAGES in favour of the DIRTY+UNSTABLE split.
> 

-- 
	Three Cheers,
	Balbir
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