From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+willy=40w.ods.org-S932071AbWHPTYa@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932071AbWHPTYa (ORCPT <rfc822;willy@w.ods.org>);
	Wed, 16 Aug 2006 15:24:30 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932178AbWHPTYa
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Wed, 16 Aug 2006 15:24:30 -0400
Received: from smtp-out.google.com ([216.239.45.12]:52312 "EHLO
	smtp-out.google.com") by vger.kernel.org with ESMTP id S932071AbWHPTY3
	(ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Wed, 16 Aug 2006 15:24:29 -0400
DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns;
	h=received:subject:from:reply-to:to:cc:in-reply-to:references:
	content-type:organization:date:message-id:mime-version:x-mailer:content-transfer-encoding;
	b=rN/T7lLJKOteDMsloNW8VjgbKzdFvawn1JVkXxUE2T6PtPRaKQ5X16eM6iUBzdMXx
	Xy50niOTjC1sTwuPv9EZw==
Subject: Re: [RFC][PATCH 4/7] UBC: syscalls (user interface)
From: Rohit Seth <rohitseth@google.com>
Reply-To: rohitseth@google.com
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Kirill Korotaev <dev@sw.ru>, Andrew Morton <akpm@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>, Christoph Hellwig <hch@infradead.org>,
       Pavel Emelianov <xemul@openvz.org>, Andrey Savochkin <saw@sw.ru>,
       devel@openvz.org, Rik van Riel <riel@redhat.com>, hugh@veritas.com,
       ckrm-tech@lists.sourceforge.net, Andi Kleen <ak@suse.de>
In-Reply-To: <1155755069.24077.392.camel@localhost.localdomain>
References: <44E33893.6020700@sw.ru>  <44E33C3F.3010509@sw.ru>
	 <1155752277.22595.70.camel@galaxy.corp.google.com>
	 <1155755069.24077.392.camel@localhost.localdomain>
Content-Type: text/plain
Organization: Google Inc
Date: Wed, 16 Aug 2006 12:22:50 -0700
Message-Id: <1155756170.22595.109.camel@galaxy.corp.google.com>
Mime-Version: 1.0
X-Mailer: Evolution 2.2.1.1 
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, 2006-08-16 at 20:04 +0100, Alan Cox wrote:
> Ar Mer, 2006-08-16 am 11:17 -0700, ysgrifennodd Rohit Seth:
> > I think there should be a check here for seeing if the new limits are
> > lower than the current usage of a resource.  If so then take appropriate
> > action.
> 
> Generally speaking there isn't a sane appropriate action because the
> resources can't just be yanked.
> 

I was more thinking about (for example) user land physical memory limit
for that bean counter.  If the limits are going down, then the system
call should try to flush out page cache pages or swap out anonymous
memory.  But you are right that it won't be possible in all cases, like
for in kernel memory limits.

-rohit