Messages in this thread | | | Date | Tue, 22 Feb 2011 14:49:56 +0100 | From | Andrea Arcangeli <> | Subject | Re: [PATCH] fix pgd_lock deadlock |
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On Tue, Feb 22, 2011 at 07:48:54AM +0000, Jan Beulich wrote: > A possible alternative would be to acquire the page table lock > in vmalloc_sync_all() only in the Xen case (perhaps by storing > NULL into page->index in pgd_set_mm() when not running on > Xen). This is utilizing the fact that there aren't (supposed to > be - for non-pvops this is definitely the case) any TLB flush IPIs > under Xen, and hence the race you're trying to fix doesn't > exist there (while non-Xen doesn't need the extra locking).
That's sure ok with me. Can we use a global runtime to check if the guest is running under Xen paravirt, instead of passing that info through page->something?
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