From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe Thornber Subject: Re: new dm-bufio Date: Tue, 23 Aug 2011 12:30:48 +0100 Message-ID: <20110823113048.GC5442@ubuntu> 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, "Alasdair G. Kergon" List-Id: dm-devel.ids On Mon, Aug 22, 2011 at 04:05:28PM -0400, Mikulas Patocka wrote: > I uploaded new dm-bufio patch at > http://people.redhat.com/mpatocka/patches/kernel/dm-thinp-bufio/dm-bufio.patch > > It reports the number of allocated bytes in > "/sys/module/dm_bufio/parameters/". There is a file "total_allocated" that > contains the number of bytes allocated for buffer cache. There are files > "allocated_get_free_pages", "allocated_kmalloc", "allocated_vmalloc" that > contain a number of allocated bytes with each method. > > BTW. if you store "1" in "cache_size", it switches to a mode where it > won't allocate any memory during operation, relying only on preallocated > reserves --- useful for testing reservation deadlocks. Great stuff, will merge straight away. Are these stats broken down by bufio client? ie. can we tell which pool/thinps are consuming all the space? Would it be possible to record a high watermark as well? This would be very useful for benchmarking. eg, we'd run a heavy load, then be able to get the peak memory usage. (Resetting this hwm would also be useful). - Joe