Messages in this thread | | | From | Andy Lutomirski <> | Date | Tue, 30 Aug 2016 07:58:07 -0700 | Subject | Re: [RFC 1/3] x86/vdso: create vdso file, use it for mapping |
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On Mon, Aug 29, 2016 at 2:50 AM, Dmitry Safonov <dsafonov@virtuozzo.com> wrote: > On 08/29/2016 12:28 PM, Andy Lutomirski wrote: >> >> On Thu, Aug 25, 2016 at 8:21 AM, Dmitry Safonov <dsafonov@virtuozzo.com> >> wrote: >>> >>> I added here a new in-kernel fs with ramfs-like options. >>> Created vdso file in this fs (yet for testing, only 64-bit vdso). >>> Mapped this file to process's mm on setup_additional_pages. >>> Just for testing purpose it's done only for specific UID. >> >> >> I'm wondering whether all this code could be easily moved into the >> core special mapping helpers so that all special mappings get the same >> benefit. We could embed a struct file * (or struct inode or whatever) >> in special_mapping if needed. > > > Hmm, yes, I guess. The only thing -- we'll still need per-arch changes > to initialize those files on booting. But that looks like the proper > generic place to move this code.
You might be able to get away with initializing on first use.
--Andy
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