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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [Crash-utility] xencrash fixes for xen-3.3.0
Hi,
I decided to use the version number of xen which is included in the
XEN_ELFNOTE_CRASH_INFO after all.
The defect is that vmcores taken on the xen-unstable during the
xen-3.3 development before the changset 17831 (2008/6/12) can not be
analized with the newer crash. I think it is not a big problem since
it is rare case to analyze such vmcores right now.
On Wed, 8 Oct 2008 08:56:48 -0400 (EDT)
Dave Anderson <anderson@xxxxxxxxxx> wrote:
>
> ----- "Itsuro ODA" <oda@xxxxxxxxxxxxx> wrote:
>
> > Hi,
> >
> > It is a good question.
> > I checked about i386. __per_cpu_data_end - __per_cpu_start is smaller
> > than 4K, but PERCPU_SHIFT is 13 (it is common both x86_32 and
> > x86_64).
> > Oops.
> >
> > I will consider more.
>
> Ok, I'll wait for a new patch set.
>
> Another direction that you might consider is to check whether
> a new symbol was introduced in the same patch-set that
> incremented the PERCPU_SHIFT values?
I found this is equivalent as using "__per_cpu_data_end - __per_cpu_start > 4K"
since the change of the PERCPU_SHIFT was for x86_64 only and it was
not helpful for i386.
> Or take Keir up on his offer to compile-in an absolute
> value that can be accessed like a symbol?
It is checked first in the patch.
> As far as the UPTIME display, it will probably raise
> fewer questions in the future if you would just remove
> it entirely.
>
> Thanks,
> Dave
>
* PERCPU_SHIFT becomes 13 (from 12) in the xen-3.3.0.
This value is determined by xen version number.
(If the symbol "__per_cpu_shift" exists, it is used first for the future.)
* "jiffies" does not exist in the xen-3.3.0.
It was used to show the uptime. I found there is no altanernative
(i.e. the xen hypervisor does not have the uptime.).
Then if "jiffies" does not exist, "--:--:--" is showed as UPTIME in
the sys command.
--- example ---
crash> sys
KERNEL: xen-syms
DUMPFILE: vmcore
CPUS: 4
DOMAINS: 5
UPTIME: --:--:--
MACHINE: Intel(R) Core(TM)2 Quad CPU Q9450 @ 2.66GHz (2660 Mhz)
MEMORY: 2 GB
----------------
This patch is for crash-4.0-7.2.
Thanks
Itsuro Oda
---
--- defs.h.org 2008-10-09 09:25:11.000000000 +0900
+++ defs.h 2008-10-09 09:53:53.000000000 +0900
@@ -4118,6 +4118,8 @@
int is_sadump_xen(void);
void set_xen_phys_start(char *);
ulong xen_phys_start(void);
+int xen_major_version(void);
+int xen_minor_version(void);
/*
* diskdump.c
--- netdump.h.org 2008-10-09 09:25:03.000000000 +0900
+++ netdump.h 2008-10-09 09:49:26.000000000 +0900
@@ -110,6 +110,8 @@
int p2m_frames;
ulong *p2m_mfn_frame_list;
ulong xen_phys_start;
+ int xen_major_version;
+ int xen_minor_version;
};
#define KDUMP_P2M_INIT (0x1)
--- netdump.c.org 2008-10-09 09:24:54.000000000 +0900
+++ netdump.c 2008-10-09 09:53:20.000000000 +0900
@@ -1525,6 +1525,8 @@
nd->xen_kdump_data->p2m_mfn =
*(uptr+(words-1));
if (words > 9 &&
!nd->xen_kdump_data->xen_phys_start)
nd->xen_kdump_data->xen_phys_start =
*(uptr+(words-2));
+ nd->xen_kdump_data->xen_major_version = *uptr;
+ nd->xen_kdump_data->xen_minor_version =
*(uptr+1);
}
}
break;
@@ -1730,6 +1732,8 @@
nd->xen_kdump_data->p2m_mfn =
*(up+(words-1));
if (words > 9 &&
!nd->xen_kdump_data->xen_phys_start)
nd->xen_kdump_data->xen_phys_start =
*(up+(words-2));
+ nd->xen_kdump_data->xen_major_version = *up;
+ nd->xen_kdump_data->xen_minor_version = *(up+1);
}
}
break;
@@ -2343,3 +2347,15 @@
{
return nd->xen_kdump_data->xen_phys_start;
}
+
+int
+xen_major_version(void)
+{
+ return nd->xen_kdump_data->xen_major_version;
+}
+
+int
+xen_minor_version(void)
+{
+ return nd->xen_kdump_data->xen_minor_version;
+}
--- xen_hyper_defs.h.org 2008-10-06 13:45:39.000000000 +0900
+++ xen_hyper_defs.h 2008-10-06 13:44:44.000000000 +0900
@@ -134,9 +134,8 @@
#endif
#if defined(X86) || defined(X86_64)
-#define XEN_HYPER_PERCPU_SHIFT 12
#define xen_hyper_per_cpu(var, cpu) \
- ((ulong)(var) + (((ulong)(cpu))<<XEN_HYPER_PERCPU_SHIFT))
+ ((ulong)(var) + (((ulong)(cpu))<<xht->percpu_shift))
#elif defined(IA64)
#define xen_hyper_per_cpu(var, cpu) \
((xht->flags & XEN_HYPER_SMP) ? \
@@ -404,6 +403,7 @@
ulong *cpumask;
uint *cpu_idxs;
ulong *__per_cpu_offset;
+ int percpu_shift;
};
struct xen_hyper_dumpinfo_context {
--- xen_hyper.c.org 2008-10-06 13:41:14.000000000 +0900
+++ xen_hyper.c 2008-10-09 11:31:24.000000000 +0900
@@ -71,6 +71,13 @@
#endif
#if defined(X86) || defined(X86_64)
+ if (symbol_exists("__per_cpu_shift")) {
+ xht->percpu_shift = (int)symbol_value("__per_cpu_shift");
+ } else if (xen_major_version() >= 3 && xen_minor_version() >= 3) {
+ xht->percpu_shift = 13;
+ } else {
+ xht->percpu_shift = 12;
+ }
member_offset = MEMBER_OFFSET("cpuinfo_x86", "x86_model_id");
buf = GETBUF(XEN_HYPER_SIZE(cpuinfo_x86));
if (xen_hyper_test_pcpu_id(XEN_HYPER_CRASHING_CPU())) {
@@ -1746,9 +1753,11 @@
tmp2 = (ulong)jiffies_64;
jiffies_64 = (ulonglong)(tmp2 - tmp1);
}
- } else {
+ } else if (symbol_exists("jiffies")) {
get_symbol_data("jiffies", sizeof(long), &jiffies);
jiffies_64 = (ulonglong)jiffies;
+ } else {
+ jiffies_64 = 0; /* hypervisor does not have uptime */
}
return jiffies_64;
--- xen_hyper_command.c.org 2008-10-07 08:05:37.000000000 +0900
+++ xen_hyper_command.c 2008-10-07 08:24:29.000000000 +0900
@@ -1022,7 +1022,8 @@
(buf1, "%d\n", XEN_HYPER_NR_DOMAINS()));
/* !!!Display a date here if it can be found. */
XEN_HYPER_PRI(fp, len, "UPTIME: ", buf1, flag,
- (buf1, "%s\n", convert_time(xen_hyper_get_uptime_hyper(),
buf2)));
+ (buf1, "%s\n", (xen_hyper_get_uptime_hyper() ?
+ convert_time(xen_hyper_get_uptime_hyper(), buf2) :
"--:--:--")));
/* !!!Display a version here if it can be found. */
XEN_HYPER_PRI_CONST(fp, len, "MACHINE: ", flag);
if (strlen(uts->machine)) {
---
--
Itsuro ODA <oda@xxxxxxxxxxxxx>
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