This patch adds the trace point for mremap which reports relevant addresses
and sizes when mremap exits successfully.
Signed-off-by: Eric B Munson <emunson@xxxxxxxxx>
---
include/trace/events/mm.h | 22 ++++++++++++++++++++++
mm/mremap.c | 4 ++++
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/mm.h b/include/trace/events/mm.h
index 892bbe3..16f8c36 100644
--- a/include/trace/events/mm.h
+++ b/include/trace/events/mm.h
@@ -69,6 +69,28 @@ TRACE_EVENT(
TP_printk("%u bytes at 0x%lx\n", __entry->len, __entry->start)
);
+TRACE_EVENT(
+ mremap,
+ TP_PROTO(unsigned long addr, unsigned long old_len,
+ unsigned long new_addr, unsigned long new_len),
+ TP_ARGS(addr, old_len, new_addr, new_len),
+ TP_STRUCT__entry(
+ __field(unsigned long, addr)
+ __field(unsigned long, old_len)
+ __field(unsigned long, new_addr)
+ __field(unsigned long, new_len)
+ ),
+ TP_fast_assign(
+ __entry->addr = addr;
+ __entry->old_len = old_len;
+ __entry->new_addr = new_addr;
+ __entry->new_len = new_len;
+ ),
+ TP_printk("%lu bytes from 0x%lx to %lu bytes at 0x%lx\n",
+ __entry->old_len, __entry->addr, __entry->new_len,
+ __entry->new_addr)
+);
+
#endif /* _TRACE_MM_H */
#include <trace/define_trace.h>
diff --git a/mm/mremap.c b/mm/mremap.c
index cde56ee..4ef1dd3 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -20,6 +20,8 @@
#include <linux/syscalls.h>
#include <linux/mmu_notifier.h>
+#include <trace/events/mm.h>
+
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
@@ -504,6 +506,8 @@ unsigned long do_mremap(unsigned long addr,
out:
if (ret & ~PAGE_MASK)
vm_unacct_memory(charged);
+ else
+ trace_mremap(addr, old_len, new_addr, new_len);
return ret;
}
--
1.7.0.4
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