linux-kernel - Re: [RFC][PATCH] proc: export more page flags in /proc/kpageflags

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Message-Id: <20090414163312.C674.A69D9226@jp.fujitsu.com>
Date:	Tue, 14 Apr 2009 16:42:17 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH] proc: export more page flags in /proc/kpageflags


> > > > > - PG_unevictable
> > > > > - PG_mlocked
>  
> How about including PG_unevictable/PG_mlocked?
> They shall be meaningful to administrators.

I explained another mail. please see it.


> > this 9 flags shouldn't exported.
> > I can't imazine administrator use what purpose those flags.
> 
> > > > > - PG_swapcache
> > > > > - PG_swapbacked
> > > > > - PG_poison
> > > > > - PG_compound
> >
> > I can agree this 4 flags.
> > However pagemap lack's hugepage considering.
> > if PG_compound exporting, we need more work.
> 
> You mean to fold PG_head/PG_tail into PG_COMPOUND?
> Yes, that's a good simplification for end users.

Yes, I agree.


> > > > > - PG_NOPAGE: whether the page is present
> > 
> > PM_NOT_PRESENT isn't enough?
> 
> That would not be usable if you are going to do a system wide scan.
> PG_NOPAGE could help differentiate the 'no page' case from 'no flags'
> case.
> 
> However PG_NOPAGE is more about the last resort. The system wide scan
> can be made much more efficient if we know the exact memory layouts.

Yup :)


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