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

["James McMechan" <james_mcmechan@hotmail.com>]

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 <jdike@addtoit.com>
>To: James McMechan <james_mcmechan@hotmail.com>
>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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