linux-kernel - [PATCH v4 2/7] mm/gup: add gup trace points

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Date:	Wed,  9 Dec 2015 09:29:19 -0800
From:	Yang Shi <yang.shi@...aro.org>
To:	akpm@...ux-foundation.org, rostedt@...dmis.org, mingo@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-kernel@...ts.linaro.org, yang.shi@...aro.org
Subject: [PATCH v4 2/7] mm/gup: add gup trace points

For slow version, just add trace point for raw __get_user_pages since all
slow variants call it to do the real work finally.

Signed-off-by: Yang Shi <yang.shi@...aro.org>
---
 mm/gup.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/gup.c b/mm/gup.c
index deafa2c..00a3cff 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -18,6 +18,9 @@
 
 #include "internal.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/gup.h>
+
 static struct page *no_page_table(struct vm_area_struct *vma,
 		unsigned int flags)
 {
@@ -462,6 +465,8 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 	if (!nr_pages)
 		return 0;
 
+	trace_gup_get_user_pages(start, nr_pages);
+
 	VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET));
 
 	/*
@@ -599,6 +604,7 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
 	if (!(vm_flags & vma->vm_flags))
 		return -EFAULT;
 
+	trace_gup_fixup_user_fault(address);
 	ret = handle_mm_fault(mm, vma, address, fault_flags);
 	if (ret & VM_FAULT_ERROR) {
 		if (ret & VM_FAULT_OOM)
@@ -1340,6 +1346,8 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 					start, len)))
 		return 0;
 
+	trace_gup_get_user_pages_fast(start, nr_pages);
+
 	/*
 	 * Disable interrupts.  We use the nested form as we can already have
 	 * interrupts disabled by get_futex_key.
-- 
2.0.2

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