lkml.org 
[lkml]   [2004]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] 2.6: mmap complement, fdmap
On Mon, Mar 22, 2004 at 12:14:56AM -0600, Matt Miller wrote:
> > On Sun, Mar 21, 2004 at 10:43:07PM -0600, Matt Miller wrote:
> > > ``flags'' can be one of O_RDONLY, O_WRONLY, or O_RDWR.
> > >
> > > I have verified functionality on ia32 and sparc as these are the only
> > > architectures I currently have some type of access to. To test, start the
> > > kernel configuration process and go under File systems/Pseudo filesystems
> > > and select this option:
> > >
> > > [*] Virtual memory file descriptor mapping support
> > >
> > > Please let me know about any and all suggestions/bugs/flames. I tried to
> >
> > *boggle*
> >
> > a) what the hell for?
>
> It's targetted mainly as a performance enhancer. Some of the specific
> scenarios where it would be useful are:
>
> a) When one cannot afford to take the performance hit of synchronizing
> a memory range to disk due to disk size limitations or speed
> requirements.
> b) Some things can benefit from the ability to interface with memory as a
> file.
>
> The specific reason for implementing this was to allow for loading dynamic
> libraries in the context of a process without having to write them to
> disk.

How about tmpfs/ramfs instead? Open a file on tmpfs and mmap it and
you've got the same thing without any of the nasty corner cases.

--
Matt Mackall : http://www.selenic.com : Linux development and consulting
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:01    [W:2.085 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site