lkml.org 
[lkml]   [2008]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.25-rc3: 34TB vmalloc total -- overflow in /proc/meminfo?

* Andi Kleen <ak@suse.de> wrote:

> Just commenting on the subject. The 34TB are not an over/underflow.
> x86-64 simply has so much address space reserved for vmalloc. It
> doesn't mean of course that that much could be actually allocated in
> real memory.

btw., the exact amount of available vmalloc space on 64-bit x86 is 32 TB
(32768 GB), or 0x0000200000000000 hexa. (this is still only 0.0002% of
the complete 64-bit address space [25% of the 128 TB 64-bit kernel
address space] so we've got plenty of room)

but the first fundamental limit we'll hit on 64-bit is the 32-bit offset
limit of binaries - this affects kernel modules, the kernel image, etc.
We wont hit that anytime soon, but we'll eventually hit it. (user-space
will be the first i guess)

Ingo


\
 
 \ /
  Last update: 2008-03-06 12:17    [W:0.293 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site