linux-kernel - [PATCH 1/4] Disable khugepaged thread

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Date:	Wed, 22 Oct 2014 21:49:24 -0500
From:	Alex Thorlton <athorlton@....com>
To:	linux-mm@...ck.org, athorlton@....com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Bob Liu <lliubbo@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Hugh Dickins <hughd@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vladimir Davydov <vdavydov@...allels.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] Disable khugepaged thread

This patch just removes any call to start khugepaged for now.  If we decide to
go forward with this new approach, then this patch will also dismantle the other
bits of khugepaged that we'll no longer need.

Signed-off-by: Alex Thorlton <athorlton@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Bob Liu <lliubbo@...il.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vladimir Davydov <vdavydov@...allels.com>
Cc: linux-kernel@...r.kernel.org

---
 mm/huge_memory.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 74c78aa..63abf52 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -295,24 +295,9 @@ static ssize_t enabled_store(struct kobject *kobj,
 			     struct kobj_attribute *attr,
 			     const char *buf, size_t count)
 {
-	ssize_t ret;
-
-	ret = double_flag_store(kobj, attr, buf, count,
-				TRANSPARENT_HUGEPAGE_FLAG,
-				TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG);
-
-	if (ret > 0) {
-		int err;
-
-		mutex_lock(&khugepaged_mutex);
-		err = start_khugepaged();
-		mutex_unlock(&khugepaged_mutex);
-
-		if (err)
-			ret = err;
-	}
-
-	return ret;
+	return double_flag_store(kobj, attr, buf, count,
+				 TRANSPARENT_HUGEPAGE_FLAG,
+				 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG);
 }
 static struct kobj_attribute enabled_attr =
 	__ATTR(enabled, 0644, enabled_show, enabled_store);
@@ -655,8 +640,6 @@ static int __init hugepage_init(void)
 	if (totalram_pages < (512 << (20 - PAGE_SHIFT)))
 		transparent_hugepage_flags = 0;
 
-	start_khugepaged();
-
 	return 0;
 out:
 	hugepage_exit_sysfs(hugepage_kobj);
-- 
1.7.12.4

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