linux-kernel - [PATCH 2/3] mm/vmalloc: Track vmalloc info changes

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Message-Id: <1440240300-6206-3-git-send-email-mingo@kernel.org>
Date:	Sat, 22 Aug 2015 12:44:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Dave Hansen <dave@...1.net>, Peter Zijlstra <peterz@...radead.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 2/3] mm/vmalloc: Track vmalloc info changes

Add a 'vmap_info_changed' flag to track changes to vmalloc()
statistics.

For simplicity this flag is set every time we unlock the
vmap_area_lock.

This flag is not yet used.

Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: linux-mm@...ck.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 mm/vmalloc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 605138083880..d21febaa557a 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -276,7 +276,9 @@ EXPORT_SYMBOL(vmalloc_to_pfn);
 #define VM_LAZY_FREEING	0x02
 #define VM_VM_AREA	0x04
 
-static DEFINE_SPINLOCK(vmap_area_lock);
+static __cacheline_aligned_in_smp DEFINE_SPINLOCK(vmap_area_lock);
+
+static int vmap_info_changed;
 
 static inline void vmap_lock(void)
 {
@@ -285,6 +287,7 @@ static inline void vmap_lock(void)
 
 static inline void vmap_unlock(void)
 {
+	vmap_info_changed = 1;
 	spin_unlock(&vmap_area_lock);
 }
 
-- 
2.1.4

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