Re: [libvirt] [v4 0/9] Support cache tune in libvirt

On Wednesday, 15 February 2017 at 1:14 AM, Marcelo Tosatti wrote: > On Tue, Feb 14, 2017 at 09:37:02AM +0100, Martin Kletzander wrote: > > On Mon, Feb 13, 2017 at 04:09:13PM -0200, Marcelo Tosatti wrote: > > > On Mon, Feb 13, 2017 at 03:42:04PM +0800, Eli Qiao wrote: > > > > we will scan for all directors while the libvirt daemon begin running, and libvirt will remove exist directories if no tasks inside of it. > > > > Definitely not. What if someone wants to create another allocation? > > They start by creating a directory, then libvirtd removes it before they > > manage to add anything to tasks. > > > > > If the other application is properly using the filesystem lock, then: > > OTHER APP, CREATE PROCEDURE: > > 1. grab fs lock. > 2. create directory. > 3. write schemata. > 4. write tasks. > 5. release fs lock > > Any operation that writes to any file in resctrlfs will first grab > the lock. So the problem being discussed is handled. >