From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: shared snapshots release 17 Date: Mon, 22 Mar 2010 15:31:03 -0400 Message-ID: <20100322193102.GA13346@redhat.com> References: Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Mikulas Patocka Cc: dm-devel@redhat.com List-Id: dm-devel.ids On Mon, Mar 22 2010 at 3:18pm -0400, Mikulas Patocka wrote: > Hi > > New shared snapshots are here. http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/r17/ > It incorporates Mike's changes and it has > reworked memory limit: > - a minimum of 8 buffers is guaranteed to prevent thrasing with too big > chunk sizes > - the cache for multisnapshots is limited to 2% of memory or 25% of > vmalloc memory (whichever is lower) [ I'm thinking about making this > configurable in /proc ] > - big chunk sizes (8MB or more) allocate memory always from vmalloc, there > is no point in allocating from general allocator Thanks, I'll have a look. Mike