linux-kernel - Re: [RFC] on general object IDs again

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Message-ID: <CAHGf_=qs+-YZ-XFx5FyWMhF4Dee3_bCGJXGmKkQ0_ED75KxxOQ@mail.gmail.com>
Date:	Wed, 11 Jan 2012 14:50:55 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kyle Moffett <kyle@...fetthome.net>, Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: [RFC] on general object IDs again

> This might work for mm_structs, although quite a lot apps now do have threads and
> this mm->users check will be negative. But how about open files? Once we entered the
> get-the-youngest-file-owner routine we need to take locks and with 1000 tasks the
> overhead is not 1000 syscalls, but 1000 (syscalls + locks).

Unfortunately, I have no knowledge your program have what assumption
of file modify. When I reviewed mincore patch from you, you said you
assume any file are preserved. And If nobody change the files, why do
we need to care file locks? I have no knowledge a grand picture of
your design at all.
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