lkml.org 
[lkml]   [2016]   [Aug]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC 1/3] x86/vdso: create vdso file, use it for mapping
From
Date
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.

> Also, could this be simplified to use anon_inode?
>
> (I'm not a VFS expert at all, so I could be way off base.)

Well, I'll try to do the second version with anon_inode.

Thanks,
Dmitry

\
 
 \ /
  Last update: 2016-09-17 09:58    [W:0.089 / U:0.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site