linux-kernel - Re: [PATCH 3/5] uprobes: introduce uprobe_xol_slots[NR

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Message-ID: <1322509921.2921.159.camel@twins>
Date:	Mon, 28 Nov 2011 20:52:01 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: Re: [PATCH 3/5] uprobes: introduce uprobe_xol_slots[NR_CPUS]

On Mon, 2011-11-28 at 20:48 +0100, Peter Zijlstra wrote:
> On Mon, 2011-11-28 at 20:07 +0100, Oleg Nesterov wrote:
> > +       UPROBE_XOL_FIRST_PAGE = UPROBE_XOL_LAST_PAGE
> > +                             + NR_CPUS * UPROBES_XOL_SLOT_BYTES / PAGE_SIZE, 
> 
> I think that wants to be: 
> 	+ DIV_ROUND_UP(NR_CPUS * UPROBES_XOL_SLOT_BYTES, PAGE_SIZE);
> 
> otherwise you'll end up with 0 pages for UP and the sort.

Ah, no I see, you'll already have the one LAST_PAGE thing.
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