I tried this on PAE Xen on a machine with 8GB.
# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 7964 1 r----- 137.9
Then, simply
# xm mem-max 0 5000
# xm list
Causes:
kernel BUG at arch/xen/i386/mm/hypervisor.c:381 (xen_create_con
tiguous_region)!
 [<c0119faa>] xen_create_contiguous_region+0x34a/0x4e0
 [<c0116ec2>] pgd_ctor+0x22/0x130
 [<c014b0a7>] cache_init_objs+0x67/0x70
 [<c014b282>] cache_grow+0x122/0x210
 [<c014b4e3>] cache_alloc_refill+0x173/0x250
 [<c014b805>] kmem_cache_alloc+0x95/0xa0
 [<c01170e3>] pgd_alloc+0x23/0x320
 [<c0111301>] sync_single+0x51/0xa0
 [<c011db23>] mm_init+0xa3/0xe0
 [<c011de6e>] copy_mm+0xbe/0x3d0
 [<c010484c>] force_evtchn_callback+0xc/0x10
 [<c011ea97>] copy_process+0x3f7/0xd40
 [<c011f4d9>] do_fork+0x69/0x184
 [<c0223142>] copy_to_user+0x42/0x90
 [<c0107b9c>] sys_clone+0x3c/0x40
 [<c0109355>] syscall_call+0x7/0xb
Kernel panic - not syncing: BUG!
 (XEN) Domain 0 shutdown: rebooting machine.
I used:
changeset: 7745:b9e8654c3f10
tag: tip
user: kaf24@xxxxxxxxxxxxxxxxxxxx
date: Thu Nov 10 19:43:56 2005 +0100
summary: Fix Linux fault.c indentation.
I tried samething on x86_64 xenlinux, but it worked fine.
Jun
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Intel Open Source Technology Center 
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