linux-kernel - [PATCH 32/36] autonuma: boost khugepaged scanning rate

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Date:	Wed, 22 Aug 2012 16:59:16 +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>,
	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>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 32/36] autonuma: boost khugepaged scanning rate

Until THP native migration is implemented it's safer to boost
khugepaged scanning rate because all memory migration are splitting
the hugepages. So the regular rate of scanning becomes too low when
lots of memory is migrated.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 mm/huge_memory.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 579e52b..00320b6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -573,6 +573,12 @@ static int __init hugepage_init(void)
 
 	set_recommended_min_free_kbytes();
 
+	/* Hack, remove after THP native migration */
+	if (autonuma_possible()) {
+		khugepaged_scan_sleep_millisecs = 100;
+		khugepaged_alloc_sleep_millisecs = 10000;
+	}
+
 	return 0;
 out:
 	hugepage_exit_sysfs(hugepage_kobj);
--
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