lkml.org 
[lkml]   [2004]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Use MPOL_INTERLEAVE for tmpfs files
--On Tuesday, November 09, 2004 21:08:11 +0000 Hugh Dickins <hugh@veritas.com> wrote:
> On Tue, 9 Nov 2004, Martin J. Bligh wrote:
>>
>> > I'm irritated to realize that we can't change the default for SysV
>> > shared memory or /dev/zero this way, because that mount is internal.
>>
>> Boggle. shmem I can perfectly understand, and have been intending to
>> change for a while. But why /dev/zero ? Presumably you'd always want
>> that local?
>
> I was meaning the mmap shared writable of /dev/zero, to get memory
> shared between parent and child and descendants, a restricted form
> of shared memory. I was thinking of them running on different cpus,
> you're suggesting they'd at least be on the same node. I dare say,
> I don't know. I'm not desperate to be able to set some other mpol
> default for all of them (and each object can be set in the established
> way), just would have been happier if the possibility of doing so came
> for free with the mount option work.

Oh yeah ... the anon mem allocator trick. Mmmm. Not sure that should
have a different default than normal alloced memory, but either way,
what you're suggesting makes a whole lot more sense to me know than
just straight /dev/zero ;-)

Thanks for the explanation.

M.

-
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 14:07    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site