[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC/PATCH v2] XENMEM_claim_pages (subop of existing) hypercall
> From: Tim Deegan [mailto:tim@xxxxxxx] > Subject: Re: [Xen-devel] [RFC/PATCH v2] XENMEM_claim_pages (subop of > existing) hypercall > > At 08:33 -0800 on 20 Nov (1353400380), Dan Magenheimer wrote: > > I agree it's possible, just saying it's not trivial... one has to > > account not only for superpages system-wide (which isn't currently > > done) but a mix of unclaimed superpages and unclaimed order==0 pages > > per-domain. Especially since that would improve launch of only a small > > and shrinking class of domains (PV && superpages=1 && mem="huge"), > > can we please consider it a possible future enhancement, not a showstopper? > > Please, no. Either you need this benighted hypercall, or you don't. > If you really need it, do it properly. Hi Tim -- I must respectfully disagree. For years, Xen has been accepting features that work on a 64-bit hypervisor but not on a 32-bit hypervisor. And new features such as memory-sharing/paging _could_ be designed to help PV domains and have completely ignored PV but have still been accepted. There is clearly precedent for new features that don't enhance every possible case. The claim feature dramatically decreases a real customer problem in the vast majority of our customer environments with no loss of functionality in the small remaining percentage. This real problem is getting continually worse as system physical RAM and domain memory requirements increase. So, yes, _we_ do need it. Considering maintenance, adding 100% claim support for remaining near-obsolescent domains will (IMHO) unnecessarily clutter both the hypervisor and the toolstack, with very little net value to real customers. So, in my opinion, it _is_ done properly already, just not obsessively. Dan P.S. Did you mean "beknighted"? Or are you referring to your omniscient toolstack as enlightened and Oracle's toolstack as ignorant? As a fan of etymology and wordplay, I'm curious... _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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