Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755561Ab1F0FlW (ORCPT ); Mon, 27 Jun 2011 01:41:22 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:41397 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756184Ab1F0FjG (ORCPT ); Mon, 27 Jun 2011 01:39:06 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 Message-ID: <4E081764.7040709@jp.fujitsu.com> Date: Mon, 27 Jun 2011 14:38:44 +0900 From: KOSAKI Motohiro User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.9.2.18) Gecko/20110616 Lightning/1.0b2 Thunderbird/3.1.11 MIME-Version: 1.0 To: P@draigBrady.com CC: andrea@betterlinux.com, akpm@linux-foundation.org, minchan.kim@gmail.com, riel@redhat.com, peterz@infradead.org, hannes@cmpxchg.org, kamezawa.hiroyu@jp.fujitsu.com, aarcange@redhat.com, hughd@google.com, jamesjer@betterlinux.com, marcus@bluehost.com, matt@bluehost.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] fadvise: move active pages to inactive list with POSIX_FADV_DONTNEED References: <1308779480-4950-1-git-send-email-andrea@betterlinux.com> <4E03200D.60704@draigBrady.com> In-Reply-To: <4E03200D.60704@draigBrady.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 901 Lines: 20 > Hmm, What if you do want to evict it from the cache for testing purposes? > Perhaps this functionality should be associated with POSIX_FADV_NOREUSE? > dd has been recently modified to support invalidating the cache for a file, > and it uses POSIX_FADV_DONTNEED for that. > http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=5f311553 This change don't break dd. dd don't have a special privilege of file cache dropping if it's also used by other processes. if you want to drop a cache forcely (maybe for testing), you need to use /proc/sys/vm/drop_caches. It's ok to ignore other processes activity because it's privilege operation. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/