[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Input: xen-kbdfront - free grant table entry in xenkbd_disconnect_backend
On 16/10/14 02:46, hansechang@xxxxxxxxx wrote: > From: Chang Huaixin <huaixin.chx@xxxxxxxxxxxxxxx> > > xenkbd_disconnect_backend doesn't free grant table entry. > This bug affects live migration. > > xenkbd_disconnect_backend uses gnttab_end_foreign_access_ref > to handle grant table entry which doesn't really free an entry. > > Thus every time we do xenkbd_resume, grant table entry increses > by one. As an grant table entry occupies 8 bytes, an grant table > page has at most 512 entries. Every 512 times we do xenkdb_resume, > grant table pages increses by one. > > After around 3500 times of live migration, grant table pages > will increase by 7, causing too many pages to populate and hitting > max_pages limit when assigning pages.Thus assign_pages will fail, > so will live migration. Acked-by: David Vrabel <david.vrabel@xxxxxxxxxx> This need to be send to the input subsystem maintainers. David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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