From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx103.postini.com [74.125.245.103]) by kanga.kvack.org (Postfix) with SMTP id 878496B0038 for ; Tue, 30 Jul 2013 11:08:49 -0400 (EDT) Date: Tue, 30 Jul 2013 08:08:10 -0700 From: Andrew Morton Subject: Re: [PATCH resend] drop_caches: add some documentation and info message Message-Id: <20130730080810.9a0a2d71.akpm@linux-foundation.org> In-Reply-To: <51F7D1F0.20309@intel.com> References: <1374842669-22844-1-git-send-email-mhocko@suse.cz> <20130729135743.c04224fb5d8e64b2730d8263@linux-foundation.org> <20130730074531.GA10584@dhcp22.suse.cz> <20130730012544.2f33ebf6.akpm@linux-foundation.org> <20130730125525.GB15847@dhcp22.suse.cz> <51F7D1F0.20309@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kosaki.motohiro@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com, bp@suse.de, Dave Hansen On Tue, 30 Jul 2013 07:47:12 -0700 Dave Hansen wrote: > On 07/30/2013 05:55 AM, Michal Hocko wrote: > >> > If we add another flag in the future it can use bit 3? > > What if we get crazy and need more of them? > > I really hate using bits for these kinds of interfaces. I'm forgetful > and never remember which bit is which, and they're possible to run out of. > > I'm not saying do it now, but we can switch over to: > > echo 'slab|pagecache' > drop_caches > or > echo 'quiet|slab' > drop_caches > > any time we want and still have compatibility with the existing bitwise > interface. /bin/drop_caches "slab|pagecache" That we always insist on doing such things in the kernel instead is exhibit #1 in Why We Suck. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org