netdev - Re: [PATCH 0/5] Candidate fix for increased number of GFP

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Message-ID: <20091102203034.GC22046@csn.ul.ie>
Date:	Mon, 2 Nov 2009 20:30:34 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Karol Lewandowski <karol.k.lewandowski@...il.com>
Cc:	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Tobias Oetiker <tobi@...iker.ch>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	David Miller <davem@...emloft.net>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Kalle Valo <kalle.valo@....fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Stephan von Krawczynski <skraw@...net.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC
	failures V2

On Fri, Oct 30, 2009 at 03:23:50PM +0100, Karol Lewandowski wrote:
> On Wed, Oct 28, 2009 at 11:59:26AM +0000, Mel Gorman wrote:
> > On Wed, Oct 28, 2009 at 12:42:08PM +0100, Karol Lewandowski wrote:
> > > On Sat, Oct 24, 2009 at 02:46:56PM +0100, Mel LKML wrote:
> > > I've tested patches 1+2+3+4 in my normal usage scenario (do some work,
> > > suspend, do work, suspend, ...) and it failed today after 4 days (== 4
> > > suspend-resume cycles).
> > > 
> > > I'll test 1-5 now.
> 
> 2.6.32-rc5 with patches 1-5 fails too.
> 
> 
> > Also, what was the behaviour of the e100 driver when suspending before
> > this commit?
> > 
> > 6905b1f1a03a48dcf115a2927f7b87dba8d5e566: Net / e100: Fix suspend of devices that cannot be power managed
> 
> This was discussed before with e100 maintainers and Rafael.  Reverting
> this patch didn't change anything.
> 

Does applying the following on top make any difference?

==== CUT HERE ====
PM: Shrink memory before suspend

This is a partial revert of c6f37f12197ac3bd2e5a35f2f0e195ae63d437de. It
is an outside possibility for fixing the e100 bug where an order-5
allocation is failing during resume. The commit notes that the shrinking
of memory should be unnecessary but maybe it is in error.

Signed-off-by: Mel Gorman <mel@....ul.ie>

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 6f10dfc..4f6ae64 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -23,6 +23,9 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
 	[PM_SUSPEND_MEM]	= "mem",
 };
 
+/* This is just an arbitrary number */
+#define FREE_PAGE_NUMBER (100)
+
 static struct platform_suspend_ops *suspend_ops;
 
 /**
@@ -78,6 +81,7 @@ static int suspend_test(int level)
 static int suspend_prepare(void)
 {
 	int error;
+	unsigned int free_pages;
 
 	if (!suspend_ops || !suspend_ops->enter)
 		return -EPERM;
@@ -92,10 +96,24 @@ static int suspend_prepare(void)
 	if (error)
 		goto Finish;
 
-	error = suspend_freeze_processes();
+	if (suspend_freeze_processes()) {
+		error = -EAGAIN;
+		goto Thaw;
+	}
+
+	free_pages = global_page_state(NR_FREE_PAGES);
+	if (free_pages < FREE_PAGE_NUMBER) {
+		pr_debug("PM: free some memory\n");
+		shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
+		if (nr_free_pages() < FREE_PAGE_NUMBER) {
+			error = -ENOMEM;
+			printk(KERN_ERR "PM: No enough memory\n");
+		}
+	}
 	if (!error)
 		return 0;
 
+ Thaw:
 	suspend_thaw_processes();
 	usermodehelper_enable();
  Finish:
--
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