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Message-Id: <1432236705-4209-5-git-send-email-j.glisse@gmail.com>
Date: Thu, 21 May 2015 15:31:13 -0400
From: j.glisse@...il.com
To: akpm@...ux-foundation.org
Cc: <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
<joro@...tes.org>, Mel Gorman <mgorman@...e.de>,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Johannes Weiner <jweiner@...hat.com>,
Larry Woodman <lwoodman@...hat.com>,
Rik van Riel <riel@...hat.com>,
Dave Airlie <airlied@...hat.com>,
Brendan Conoboy <blc@...hat.com>,
Joe Donohue <jdonohue@...hat.com>,
Duncan Poole <dpoole@...dia.com>,
Sherry Cheung <SCheung@...dia.com>,
Subhash Gutti <sgutti@...dia.com>,
John Hubbard <jhubbard@...dia.com>,
Mark Hairgrove <mhairgrove@...dia.com>,
Lucien Dunning <ldunning@...dia.com>,
Cameron Buschardt <cabuschardt@...dia.com>,
Arvind Gopalakrishnan <arvindg@...dia.com>,
Haggai Eran <haggaie@...lanox.com>,
Shachar Raindel <raindel@...lanox.com>,
Liran Liss <liranl@...lanox.com>,
Roland Dreier <roland@...estorage.com>,
Ben Sander <ben.sander@....com>,
Greg Stoner <Greg.Stoner@....com>,
John Bridgman <John.Bridgman@....com>,
Michael Mantor <Michael.Mantor@....com>,
Paul Blinzer <Paul.Blinzer@....com>,
Laurent Morichetti <Laurent.Morichetti@....com>,
Alexander Deucher <Alexander.Deucher@....com>,
Oded Gabbay <Oded.Gabbay@....com>,
Jérôme Glisse <jglisse@...hat.com>
Subject: [PATCH 04/36] mmu_notifier: allow range invalidation to exclude a specific mmu_notifier
From: Jérôme Glisse <jglisse@...hat.com>
This patch allow to invalidate a range while excluding call to a specific
mmu_notifier which allow for a subsystem to invalidate a range for everyone
but itself.
Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
---
include/linux/mmu_notifier.h | 60 +++++++++++++++++++++++++++++++++++++++-----
mm/mmu_notifier.c | 16 +++++++++---
2 files changed, 67 insertions(+), 9 deletions(-)
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 283ad26..867ca06 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -294,11 +294,15 @@ extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
struct page *page,
enum mmu_event event);
extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- struct mmu_notifier_range *range);
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude);
extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- struct mmu_notifier_range *range);
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude);
extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
- unsigned long start, unsigned long end);
+ unsigned long start,
+ unsigned long end,
+ const struct mmu_notifier *exclude);
extern bool mmu_notifier_range_is_valid(struct mm_struct *mm,
unsigned long start,
unsigned long end);
@@ -351,21 +355,46 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
struct mmu_notifier_range *range)
{
if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range_start(mm, range);
+ __mmu_notifier_invalidate_range_start(mm, range, NULL);
}
static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
struct mmu_notifier_range *range)
{
if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range_end(mm, range);
+ __mmu_notifier_invalidate_range_end(mm, range, NULL);
}
static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
- __mmu_notifier_invalidate_range(mm, start, end);
+ __mmu_notifier_invalidate_range(mm, start, end, NULL);
+}
+
+static inline void mmu_notifier_invalidate_range_start_excluding(struct mm_struct *mm,
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
+{
+ if (mm_has_notifiers(mm))
+ __mmu_notifier_invalidate_range_start(mm, range, exclude);
+}
+
+static inline void mmu_notifier_invalidate_range_end_excluding(struct mm_struct *mm,
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
+{
+ if (mm_has_notifiers(mm))
+ __mmu_notifier_invalidate_range_end(mm, range, exclude);
+}
+
+static inline void mmu_notifier_invalidate_range_excluding(struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end,
+ const struct mmu_notifier *exclude)
+{
+ if (mm_has_notifiers(mm))
+ __mmu_notifier_invalidate_range(mm, start, end, exclude);
}
static inline void mmu_notifier_mm_init(struct mm_struct *mm)
@@ -515,6 +544,25 @@ static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
{
}
+static inline void mmu_notifier_invalidate_range_start_excluding(struct mm_struct *mm,
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
+{
+}
+
+static inline void mmu_notifier_invalidate_range_end_excluding(struct mm_struct *mm,
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
+{
+}
+
+static inline void mmu_notifier_invalidate_range_excluding(struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end,
+ const struct mmu_notifier *exclude)
+{
+}
+
static inline void mmu_notifier_mm_init(struct mm_struct *mm)
{
}
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 2ff6d43..43172c6 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -175,7 +175,8 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm,
}
void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
- struct mmu_notifier_range *range)
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
{
struct mmu_notifier *mn;
@@ -188,6 +189,8 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
id = srcu_read_lock(&srcu);
hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
+ if (mn == exclude)
+ continue;
if (mn->ops->invalidate_range_start)
mn->ops->invalidate_range_start(mn, mm, range);
}
@@ -196,13 +199,16 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
- struct mmu_notifier_range *range)
+ struct mmu_notifier_range *range,
+ const struct mmu_notifier *exclude)
{
struct mmu_notifier *mn;
int id;
id = srcu_read_lock(&srcu);
hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
+ if (mn == exclude)
+ continue;
/*
* Call invalidate_range here too to avoid the need for the
* subsystem of having to register an invalidate_range_end
@@ -233,13 +239,17 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_end);
void __mmu_notifier_invalidate_range(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+ unsigned long start,
+ unsigned long end,
+ const struct mmu_notifier *exclude)
{
struct mmu_notifier *mn;
int id;
id = srcu_read_lock(&srcu);
hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) {
+ if (mn == exclude)
+ continue;
if (mn->ops->invalidate_range)
mn->ops->invalidate_range(mn, mm, start, end);
}
--
1.9.3
--
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