linux-kernel - [PATCH 11/35] autonuma: core autonuma.h header

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Message-Id: <1337965359-29725-12-git-send-email-aarcange@redhat.com>
Date:	Fri, 25 May 2012 19:02:15 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>
Subject: [PATCH 11/35] autonuma: core autonuma.h header

This is the generic autonuma.h header that defines the generic
AutoNUMA specific functions like autonuma_setup_new_exec,
autonuma_split_huge_page, numa_hinting_fault, etc...

As usual functions like numa_hinting_fault that only matter for builds
with CONFIG_AUTONUMA=y are defined unconditionally, but they are only
linked into the kernel if CONFIG_AUTONUMA=n. Their call sites are
optimized away at build time (or kernel won't link).

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 include/linux/autonuma.h |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)
 create mode 100644 include/linux/autonuma.h

diff --git a/include/linux/autonuma.h b/include/linux/autonuma.h
new file mode 100644
index 0000000..a963dcb
--- /dev/null
+++ b/include/linux/autonuma.h
@@ -0,0 +1,41 @@
+#ifndef _LINUX_AUTONUMA_H
+#define _LINUX_AUTONUMA_H
+
+#ifdef CONFIG_AUTONUMA
+
+#include <linux/autonuma_flags.h>
+
+extern void autonuma_enter(struct mm_struct *mm);
+extern void autonuma_exit(struct mm_struct *mm);
+extern void __autonuma_migrate_page_remove(struct page *page);
+extern void autonuma_migrate_split_huge_page(struct page *page,
+					     struct page *page_tail);
+extern void autonuma_setup_new_exec(struct task_struct *p);
+
+static inline void autonuma_migrate_page_remove(struct page *page)
+{
+	if (ACCESS_ONCE(page->autonuma_migrate_nid) >= 0)
+		__autonuma_migrate_page_remove(page);
+}
+
+#define autonuma_printk(format, args...) \
+	if (autonuma_debug()) printk(format, ##args)
+
+#else /* CONFIG_AUTONUMA */
+
+static inline void autonuma_enter(struct mm_struct *mm) {}
+static inline void autonuma_exit(struct mm_struct *mm) {}
+static inline void autonuma_migrate_page_remove(struct page *page) {}
+static inline void autonuma_migrate_split_huge_page(struct page *page,
+						    struct page *page_tail) {}
+static inline void autonuma_setup_new_exec(struct task_struct *p) {}
+
+#endif /* CONFIG_AUTONUMA */
+
+extern pte_t __pte_numa_fixup(struct mm_struct *mm, struct vm_area_struct *vma,
+			      unsigned long addr, pte_t pte, pte_t *ptep);
+extern void __pmd_numa_fixup(struct mm_struct *mm, struct vm_area_struct *vma,
+			     unsigned long addr, pmd_t *pmd);
+extern void numa_hinting_fault(struct page *page, int numpages);
+
+#endif /* _LINUX_AUTONUMA_H */
--
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