linux-kernel - [PATCH v3 3/7] x86: mm/gup: add gup trace points

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Message-Id: <1449603595-718-4-git-send-email-yang.shi@linaro.org>
Date:	Tue,  8 Dec 2015 11:39:51 -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,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [PATCH v3 3/7] x86: mm/gup: add gup trace points

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Signed-off-by: Yang Shi <yang.shi@...aro.org>
---
 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..081f69d 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>>
+
 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, (unsigned long) 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, (unsigned long) nr_pages);
+
 	VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
 	return nr;
 
-- 
2.0.2

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