Itsuro ODA wrote:
Hi,
This patch is for xen hypervisor analysis function of the
crash command to apply to the xen-3.3.0 (the newest version of xen).
* PERCPU_SHIFT becomes 13 (from 12) in the xen-3.3.0.
This value is calculated from "__per_cpu_start" and "__per_cpu_data_end".
* "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.
(Is it better to eliminate the whole UPTIME line ?)
--- 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
The patch looks OK. But just for sanity's sake, is it guaranteed that
the per_cpu data section will be greater than 4k on both architectures?
Or could there be some combination of xen CONFIG options that could
reduce the i386 per_cpu data section contents to less than 4K even though
PERCPU_SHIFT is 13?
Dave
---
--- 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 2008-10-06 14:15:03.000000000 +0900
@@ -71,6 +71,8 @@
#endif
#if defined(X86) || defined(X86_64)
+ xht->percpu_shift =
+ (symbol_value("__per_cpu_data_end") - symbol_value("__per_cpu_start")
> 4096) ? 13: 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 +1748,11 @@
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)) {
---
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