Re: [uml-devel] many cow files with ubd_kern.c

[Jeff Dike <jdike@addtoit.com>]

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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