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authorIngo Molnar <mingo@kernel.org>2017-02-03 11:03:31 +0100
committerIngo Molnar <mingo@kernel.org>2017-03-02 08:42:25 +0100
commit314ff7851fc8ea66cbf48eaa93d8ebfb5ca084a9 (patch)
tree16567343faf3f9e94a56bbf431c1e54414cdbb6d /include
parent780de9dd2720debc14c501dab4dc80d1f75ad50e (diff)
downloadlinux-314ff7851fc8ea66cbf48eaa93d8ebfb5ca084a9.tar.bz2
mm/vmacache, sched/headers: Introduce 'struct vmacache' and move it from <linux/sched.h> to <linux/mm_types>
The <linux/sched.h> header includes various vmacache related defines, which are arguably misplaced. Move them to mm_types.h and minimize the sched.h impact by putting all task vmacache state into a new 'struct vmacache' structure. No change in functionality. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm_types.h12
-rw-r--r--include/linux/sched.h11
-rw-r--r--include/linux/vmacache.h2
3 files changed, 17 insertions, 8 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4f6d440ad785..137797cd7b50 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -360,6 +360,18 @@ struct vm_area_struct {
struct vm_userfaultfd_ctx vm_userfaultfd_ctx;
};
+/*
+ * The per task VMA cache array:
+ */
+#define VMACACHE_BITS 2
+#define VMACACHE_SIZE (1U << VMACACHE_BITS)
+#define VMACACHE_MASK (VMACACHE_SIZE - 1)
+
+struct vmacache {
+ u32 seqnum;
+ struct vm_area_struct *vmas[VMACACHE_SIZE];
+};
+
struct core_thread {
struct task_struct *task;
struct core_thread *next;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3f61baac928b..e87c97e1a947 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -134,10 +134,6 @@ struct blk_plug;
struct filename;
struct nameidata;
-#define VMACACHE_BITS 2
-#define VMACACHE_SIZE (1U << VMACACHE_BITS)
-#define VMACACHE_MASK (VMACACHE_SIZE - 1)
-
/*
* These are the constant used to fake the fixed-point load-average
* counting. Some notes:
@@ -1550,9 +1546,10 @@ struct task_struct {
#endif
struct mm_struct *mm, *active_mm;
- /* per-thread vma caching */
- u32 vmacache_seqnum;
- struct vm_area_struct *vmacache[VMACACHE_SIZE];
+
+ /* Per-thread vma caching: */
+ struct vmacache vmacache;
+
#if defined(SPLIT_RSS_COUNTING)
struct task_rss_stat rss_stat;
#endif
diff --git a/include/linux/vmacache.h b/include/linux/vmacache.h
index c3fa0fd43949..1081db987391 100644
--- a/include/linux/vmacache.h
+++ b/include/linux/vmacache.h
@@ -12,7 +12,7 @@
static inline void vmacache_flush(struct task_struct *tsk)
{
- memset(tsk->vmacache, 0, sizeof(tsk->vmacache));
+ memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));
}
extern void vmacache_flush_all(struct mm_struct *mm);