linux-kernel - Re: Free memory never fully used, swapping

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Message-Id: <20101130092534.82D5.A69D9226@jp.fujitsu.com>
Date:	Tue, 30 Nov 2010 09:25:23 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	kosaki.motohiro@...fujitsu.com, Simon Kirby <sim@...tway.ca>,
	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: Free memory never fully used, swapping

> On Thu, 25 Nov 2010, KOSAKI Motohiro wrote:
> > Please try SLAB instead SLUB (it can be switched by kernel build option).
> > SLUB try to use high order allocation implicitly.
> 
> SLAB uses orders 0-1. Order is fixed per slab cache and determined based
> on object size at slab creation.
> 
> SLUB uses orders 0-3. Falls back to smallest order if alloc order cannot
> be met by the page allocator.
> 
> One can reduce SLUB to SLAB orders by specifying the following kernel
> commandline parameter:
> 
> slub_max_order=1

This?


>From 3edd305fc58ac89364806cd60140793d37422acc Mon Sep 17 00:00:00 2001
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Date: Fri, 24 Dec 2010 18:04:10 +0900
Subject: [PATCH] slub: reduce slub_max_order by default

slab is already using order-1.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/slub.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 8c66aef..babf359 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1964,7 +1964,8 @@ static struct page *get_object_page(const void *x)
  * take the list_lock.
  */
 static int slub_min_order;
-static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
+/* order-1 is maximum size which we can assume to exist always. */
+static int slub_max_order = 1;
 static int slub_min_objects;
 
 /*
-- 
1.6.5.2



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