linux-kernel - [PATCH 16/35] autonuma: autonuma

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Date:	Fri, 25 May 2012 19:02:20 +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 16/35] autonuma: autonuma_enter/exit

The first gear in the whole AutoNUMA algorithm is knuma_scand. If
knuma_scand doesn't run AutoNUMA is a full bypass. If knuma_scand is
stopped, soon all other AutoNUMA gears will settle down too.

knuma_scand is the daemon that sets the pmd_numa and pte_numa and
allows the NUMA hinting page faults to start and then all other
actions follows as a reaction to that.

knuma_scand scans a list of "mm" and this is where we register and
unregister the "mm" into AutoNUMA for knuma_scand to scan them.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 kernel/fork.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 98db8b0..237c34e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -70,6 +70,7 @@
 #include <linux/khugepaged.h>
 #include <linux/signalfd.h>
 #include <linux/uprobes.h>
+#include <linux/autonuma.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -539,6 +540,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
 	if (likely(!mm_alloc_pgd(mm))) {
 		mm->def_flags = 0;
 		mmu_notifier_mm_init(mm);
+		autonuma_enter(mm);
 		return mm;
 	}
 
@@ -607,6 +609,7 @@ void mmput(struct mm_struct *mm)
 		exit_aio(mm);
 		ksm_exit(mm);
 		khugepaged_exit(mm); /* must run before exit_mmap */
+		autonuma_exit(mm); /* must run before exit_mmap */
 		exit_mmap(mm);
 		set_mm_exe_file(mm, NULL);
 		if (!list_empty(&mm->mmlist)) {
--
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