Humm, I will look to see if that happens on my machines, nope
I just tested on a machine with more real memory but no skas3 no tmpfs I
appear to have ~64M in use with one COW bitmap and 140M in use with 2 (from
top in guest) the
other machine was shrinking the guest virtual address space to ~128M even
when told to use 384M and the tmp(on tmpfs) was remounted with
-oremount,size=10G
Though come to think of it the guest does not really need to have the
vmalloced space
actually allocated with the backing file on tmp... but I can't think of a
way to have it just mapped into high memory or something, but that would
really be the place to put the 600M of bitmaps I expect to have if I can get
things working.
From: Jeff Dike <[EMAIL PROTECTED]>
To: James McMechan <[EMAIL PROTECTED]>
CC: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] many cow files with ubd_kern.c
Date: Sat, 28 Jan 2006 21:46:20 -0500
On Sat, Jan 28, 2006 at 11:11:31PM +0000, James McMechan wrote:
> allocation failed: out of vmalloc space - use "vmalloc=<size>" to
increse
> size
> Failed to vmalloc COW bitmap
> ubd0: Can't open "COW0": errno -12
I have a report (which I haven't looked into yet) of the ubd driver
double-vmallocing the bitmap. This is the call trace of the vmallocs
as reported on IRC:
ubd_add
enter
Attempting to vmalloc COW bitmap \"cow0\" at
25600
cow.bitmap = 0x00000000 (before vmalloc)
abrooks
cow.bitmap = 0xa2800000 (after vmalloc)
ubd_open enter
Attempting to vmalloc COW bitmap \"cow0\" at 25600
cow.bitmap =
0xa2800000 (before vmalloc)
cow.bitmap = 0xa280a000 (after
vmalloc)
ubd_open exit
/dev/ubd/disc0: p1
abrooks
ubd_close() enter
ubd_close() exit
ubd_close()
enter
ubd_close() exit
ubd_add exit
Jeff
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