Dne ?t 23. srpna 2012 14:10:21 jste napsal(a):
> Dne ?t 23. srpna 2012 12:00:41 jste napsal(a):
> > Hello Petr,
> >
> > Actually we didn't need to patch the crash utility for the SLES11 SP1
> > version we use. When I call the crash utility with the vmcore.d0 argument
> >
> > that your current makedumpfile version produces, I see:
> > WARNING: crashing_cpu not found.
> > crash: invalid kernel virtual address: 0 type: "opt_sched,"
> >
> > crash: cannot read opt_sched,.
Hello Norbert once again,
I've investigated the logic once more, and we should probably rethink what
we're filtering out for "-X". The manual page says:
-X Exclude all the user domain pages from Xen kdump's VMCORE, and
extracts the part of xen and domain-0.
So, depending on how I read it, it should either:
a. throw away anything but dom_xen, dom_io and dom0, or
b. keep everything except domU
I vote for a, because it should give the smallest dump. Now, all such pages
will have:
1. PGC_allocated (it is allocated to a domain)
2. one of the 3 known values for _domain
All else only adds unnecessary complexity. But even that does not cover all
cases. For example the "opt_sched" (actually ops.opt_name) is stored at
physical address 0x3fa38b28 (PFN 0x3fa38), but frame_table[0x3fa38] is:
struct page_info {
{
list = {
next = 0,
prev = 0
},
up = 0,
shr_handle = 0
},
count_info = 0,
u = {
inuse = {
type_info = 0
},
sh = {
type = 0,
pinned = 0,
count = 0
},
free = {
need_tlbflush = 0 '\000'
}
},
v = {
inuse = {
_domain = 0
},
sh = {
back = 0
},
free = {
order = 0
}
},
{
tlbflush_timestamp = 0,
{
nr_validated_ptes = 0,
partial_pte = 0 '\000'
},
shadow_flags = 0,
next_shadow = 0
}
}
This looks pretty uninitialized to me. Your patch keeps this page, because you
don't filter out anything that has PGC_allocated==0 and PGC_state_inuse
(numerically 0), but I'm not sure that's right.
I'll try asking on the Xen mailing list about the intended hierarchy of the
various PGC_xxx flags.
Petr Tesarik
SUSE Linux
