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Subject[PATCH] tracing: add trace event for memory-failure
Date
Memory-failure as the high level machine check handler, it's necessary
to report memory page recovery action result to user space by ftrace.

This patch add a event at ras group for memory-failure.

The output like below:
# tracer: nop
#
# entries-in-buffer/entries-written: 2/2 #P:24
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
mce-inject-13150 [001] .... 277.019359: memory_failure_event: pfn 0x19869: free buddy page recovery: Delayed

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
---
include/ras/ras_event.h | 36 ++++++++++++++++++++++++++++++++++++
mm/memory-failure.c | 3 +++
2 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 79abb9c..0a6c8f3 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -232,6 +232,42 @@ TRACE_EVENT(aer_event,
__print_flags(__entry->status, "|", aer_uncorrectable_errors))
);

+/*
+ * memory-failure recovery action result event
+ *
+ * unsigned long pfn - Page Number of the corrupted page
+ * char * action - Recovery action: "free buddy", "free huge", "high
+ * order kernel", "free buddy, 2nd try", "different
+ * compound page after locking", "hugepage already
+ * hardware poisoned", "unmapping failed", "already
+ * truncated LRU", etc.
+ * char * result - Action result: Ignored, Failed, Delayed, Recovered.
+ */
+TRACE_EVENT(memory_failure_event,
+ TP_PROTO(const unsigned long pfn,
+ const char *action,
+ const char *result),
+
+ TP_ARGS(pfn, action, result),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __string(action, action)
+ __string(result, result)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __assign_str(action, action);
+ __assign_str(result, result);
+ ),
+
+ TP_printk("pfn %#lx: %s page recovery: %s",
+ __entry->pfn,
+ __get_str(action),
+ __get_str(result)
+ )
+);
#endif /* _TRACE_HW_EVENT_MC_H */

/* This part must be outside protection */
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index d487f8d..86a9cce 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -56,6 +56,7 @@
#include <linux/mm_inline.h>
#include <linux/kfifo.h>
#include "internal.h"
+#include <ras/ras_event.h>

int sysctl_memory_failure_early_kill __read_mostly = 0;

@@ -837,6 +838,8 @@ static struct page_state {
*/
static void action_result(unsigned long pfn, char *msg, int result)
{
+ trace_memory_failure_event(pfn, msg, action_name[result]);
+
pr_err("MCE %#lx: %s page recovery: %s\n",
pfn, msg, action_name[result]);
}
--
1.7.1


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