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Re: [Xen-devel] build problem in linux-2.6.18-xen.hg?
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] build problem in linux-2.6.18-xen.hg? |
| From: | Grzegorz Milos <gm281@xxxxxxxxx> |
| Date: | Tue, 22 Dec 2009 22:33:06 +0000 |
| Cc: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Patrick Colp <pjcolp@xxxxxxxxx> |
| Delivery-date: | Tue, 22 Dec 2009 14:33:28 -0800 |
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> *However*, cc'ing Gregor and Patrick as that raises the question of why this > wasn't noticed sooner. Why do we have grant-table interface extensions being > defined in a guest, but apparently no use of them (and hence no > implementation of them?) in Xen itself? I'm talking about > GNTMAP_can_fail/GNTCOPY_can_fail/GNTST_eagain -- is linux-2.6.18-xen > defining using these just for its own amusement? GNTMAP_* are meant to be used by Xen, however at the moment we've got some leftovers from the original approach we used to handle OOM conditions. In there, we maintained a pool of pages to handle certain 'critical' operations which should not fail (such as unsharing grated pages). However, it quickly turned out that the memory pool would have to grow unacceptably large. A more invasive approach, which we finally decide to take, was to fixup all grant op callers to handle EAGAIN. The last remaining patch (which I'm already working on) is to cleanup the mem pool code in Xen, and return EAGAIN on failure instead. For the time being, I have an explicit check (with a BUG()) on failed page unshares, so that they'll never go unnoticed. Thanks Gregor _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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