On Wed, Jun 25, 2014 at 2:09 PM, Gleb Smirnoff <gleb...@freebsd.org> wrote: > On Wed, Jun 25, 2014 at 01:58:29PM +0200, Attilio Rao wrote: > A> > Log: > A> > xen/virtio: fix balloon drivers to not mark pages as WIRED > A> > > A> > Prevent the Xen and VirtIO balloon drivers from marking pages as > A> > wired. This prevents them from increasing the system wired page count, > A> > which can lead to mlock failing because of hitting the limit in > A> > vm.max_wired. > A> > A> This change is conceptually wrong. > A> The pages balloon is allocating are unmanaged and they should be wired > A> by definition. Alan and I are considering enforcing this (mandatory > A> wired pages for unmanaged pages allocation) directly in the KPI. > A> This in practice just seem an artifact to deal with scarce wired > A> memory limit. I suggest that for the XEN case this limit gets bumped > A> rather relying on similar type of hacks. > > Proper limit would be to count pages wired by userland via mlock(2) > and enforce limit only on those pages. Pages wired by kernel should > be either unlimited or controled by a separate limit.
FWIW, I mostly agree with this. I think that the kernel and userland limits should be split apart. But for the time being, rising the limit is better. Attilio -- Peace can only be achieved by understanding - A. Einstein _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
