On Mon, Sep 16, 2013 at 10:42:11PM -0400, Peter Hurley wrote: > On 09/12/2013 11:38 PM, Fengguang Wu wrote: > >On Thu, Sep 12, 2013 at 08:17:00PM -0700, Greg KH wrote: > >>On Fri, Sep 13, 2013 at 08:51:33AM +0800, Fengguang Wu wrote: > >>>Hi Peter, > >>> > >>>FYI, we noticed much increased vmap_area_lock contentions since this > >>>commit: > >> > >>What does that mean? What is happening, are we allocating/removing more > >>memory now? > > > >// leave this question to Peter and Tejun. :) > > > >>What type of load were you running that showed this problem? > > > >The increased contentions and lock hold/wait time showed up in a > >number of test cases. > > How is the raw data acquired? > > For example, is the test apparatus reading from /proc/vmallocinfo > (which claims the vmap_area_lock) during the test execution?
We didn't read /proc/vmallocinfo and read /proc/lock_stat once when the test ends. > I'm wondering if a Heisenberg effect is happening here. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
