On 12/9/2015 1:07 PM, Steven Rostedt wrote:
On Wed, 9 Dec 2015 09:29:20 -0800
Yang Shi <yang.shi@xxxxxxxxxx> wrote:
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxx>
---
arch/x86/mm/gup.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index ae9a37b..a96bcb7 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -12,6 +12,9 @@
#include <asm/pgtable.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/gup.h>>
First off, does the above even compile?
Second, you already created the tracepoints in mm/gup.c, why are you
creating them here again? CREATE_TRACE_POINTS must be defined only once
per events/.h file.
Sorry for that. The typo was introduced by git amend without running
test build. The multiple definition of trace points was not caught by my
shaky test script.
Will fix them soon.
Thanks,
Yang
-- Steve
+
static inline pte_t gup_get_pte(pte_t *ptep)
{
#ifndef CONFIG_X86_PAE
@@ -270,6 +273,8 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
(void __user *)start, len)))
return 0;
+ trace_gup_get_user_pages_fast(start, nr_pages);
+
/*
* XXX: batch / limit 'nr', to avoid large irq off latency
* needs some instrumenting to determine the common sizes used by
@@ -373,6 +378,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
} while (pgdp++, addr = next, addr != end);
local_irq_enable();
+ trace_gup_get_user_pages_fast(start, nr_pages);
+
VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
return nr;
--
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