linux-kernel - [PATCH 38/39] autonuma: boost khugepaged scanning rate

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Message-Id: <1332783986-24195-39-git-send-email-aarcange@redhat.com>
Date:	Mon, 26 Mar 2012 19:46:25 +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>
Subject: [PATCH 38/39] 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 |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 017c0a3..b919c0c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -573,6 +573,14 @@ static int __init hugepage_init(void)
 
 	set_recommended_min_free_kbytes();
 
+#ifdef CONFIG_AUTONUMA
+	/* Hack, remove after THP native migration */
+	if (num_possible_nodes() > 1) {
+		khugepaged_scan_sleep_millisecs = 100;
+		khugepaged_alloc_sleep_millisecs = 10000;
+	}
+#endif
+
 	return 0;
 out:
 	hugepage_exit_sysfs(hugepage_kobj);
--
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