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Date: Tue, 13 Oct 2009 16:19:41 +0900
From: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To: Ingo Molnar <mingo@...e.hu>
CC: Huang Ying <ying.huang@...el.com>,
"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RFC] x86, mce: use of TRACE_EVENT for mce
Ingo Molnar wrote:
> * Huang Ying <ying.huang@...el.com> wrote:
>
>> I have talked with Ingo about this patch. But he has different idea
>> about MCE log ring buffer and he didn't want to merge the patch even
>> as an urgent bug fixes. It seems that another re-post can not convince
>> him.
>
> Correct. The fixes are beyond what we can do in .32 - and for .33 i
> outlined (with a patch) that we should be using not just the ftrace
> ring-buffer (like your patch did) but perf events to expose MCE events.
>
> That brings MCE events to a whole new level of functionality.
>
> Event injection support would be an interesting new addition to
> kernel/perf_event.c: non-MCE user-space wants to inject events as well -
> both to simulate rare events, and to define their own user-space events.
>
> Is there any technical reason why we wouldnt want to take this far
> superior approach?
>
> Ingo
We could have more aggressive discussion if there is a real patch.
This is an example.
Thanks,
H.Seto
===
Subject: [PATCH] [RFC] x86, mce: trial use of TRACE_EVENT for mce
(As a response to "x86: mce: New MCE logging design" from Ingo)
Just forward record to trace buffer.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
arch/x86/kernel/cpu/mcheck/mce.c | 6 +++
include/trace/events/mce.h | 69 ++++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+), 0 deletions(-)
create mode 100644 include/trace/events/mce.h
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index b1598a9..2d563cd 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -46,6 +46,9 @@
#include "mce-internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/mce.h>
+
int mce_disabled __read_mostly;
#define MISC_MCELOG_MINOR 227
@@ -141,6 +144,9 @@ void mce_log(struct mce *mce)
{
unsigned next, entry;
+ /* Forward record to trace buffer for several use */
+ trace_mce_record(mce);
+
mce->finished = 0;
wmb();
for (;;) {
diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h
new file mode 100644
index 0000000..7eee778
--- /dev/null
+++ b/include/trace/events/mce.h
@@ -0,0 +1,69 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mce
+
+#if !defined(_TRACE_MCE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MCE_H
+
+#include <linux/ktime.h>
+#include <linux/tracepoint.h>
+#include <asm/mce.h>
+
+TRACE_EVENT(mce_record,
+
+ TP_PROTO(struct mce *m),
+
+ TP_ARGS(m),
+
+ TP_STRUCT__entry(
+ __field( u64, mcgcap )
+ __field( u64, mcgstatus )
+ __field( u8, bank )
+ __field( u64, status )
+ __field( u64, addr )
+ __field( u64, misc )
+ __field( u64, ip )
+ __field( u8, cs )
+ __field( u64, tsc )
+ __field( u64, walltime )
+ __field( u32, cpu )
+ __field( u32, cpuid )
+ __field( u32, apicid )
+ __field( u32, socketid )
+ __field( u8, cpuvendor )
+ ),
+
+ TP_fast_assign(
+ __entry->mcgcap = m->mcgcap;
+ __entry->mcgstatus = m->mcgstatus;
+ __entry->bank = m->bank;
+ __entry->status = m->status;
+ __entry->addr = m->addr;
+ __entry->misc = m->misc;
+ __entry->ip = m->ip;
+ __entry->cs = m->cs;
+ __entry->tsc = m->tsc;
+ __entry->walltime = m->time;
+ __entry->cpu = m->extcpu;
+ __entry->cpuid = m->cpuid;
+ __entry->apicid = m->apicid;
+ __entry->socketid = m->socketid;
+ __entry->cpuvendor = m->cpuvendor;
+ ),
+
+ TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, ADDR/MISC: %016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x",
+ __entry->cpu,
+ __entry->mcgcap, __entry->mcgstatus,
+ __entry->bank, __entry->status,
+ __entry->addr, __entry->misc,
+ __entry->cs, __entry->ip,
+ __entry->tsc,
+ __entry->cpuvendor, __entry->cpuid,
+ __entry->walltime,
+ __entry->socketid,
+ __entry->apicid)
+);
+
+#endif /* _TRACE_MCE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
1.6.4.4
--
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