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[Xen-devel] tmem and construct_dom0 memory allocation race
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] tmem and construct_dom0 memory allocation race |
| From: | Dulloor <dulloor@xxxxxxxxx> |
| Date: | Fri, 18 Jun 2010 16:10:06 -0700 |
| Delivery-date: | Fri, 18 Jun 2010 16:11:11 -0700 |
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tmem could cause Dom0 allocation to fail with error "Not enough RAM for DOM0 reservation", particularly when used without dom0_mem option. Following is the sequence : - init_tmem allocates a set of pages and sets up dstmem and workmem to alloc pages in MP case (with cpu notifiers) - construct_dom0 estimates nr_pages by calling avail_domheap_pages - On other CPUs, tmem cpu_notifier gets called and allocates pages from domheap, making the construct_dom0's estimate stale. - construct_dom0 fails tmem=off or dom0_mem=xxx both solve the problem for now. -dulloor _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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