linux-kernel - Re: 2.6.24-rc5-mm1 -- inconsistent {in-hardirq-W} -> {hardirq-on-W} usage -- pm-hibernate/9940 [HC0[0]:SC0[0]:HE1:SE1]

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Message-Id: <200712200109.20452.rjw@sisk.pl>
Date:	Thu, 20 Dec 2007 01:09:19 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Christoph Lameter <clameter@....com>
Cc:	Daniel Walker <dwalker@...sta.com>,
	Miles Lane <miles.lane@...il.com>,
	Pavel Machek <pavel@...e.cz>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.24-rc5-mm1 -- inconsistent {in-hardirq-W} -> {hardirq-on-W} usage -- pm-hibernate/9940 [HC0[0]:SC0[0]:HE1:SE1]

On Thursday, 20 of December 2007, Christoph Lameter wrote:
> On Thu, 20 Dec 2007, Rafael J. Wysocki wrote:
> 
> > > We could reexport drain_local_pages() again but then I do not understand 
> > > why we would only drain the pages of this processor and not of all other
> > > processors as well. It seems that software suspend intend was to flush 
> > > them all right?
> > 
> > Well, not exactly.  We are on one CPU at this point, the others have been
> > disabled.
> 
> Ok so the others are flush. Here is a patch to re-export 
> drain_local_pages() again and use it for software suspend:
> 
> Signed-off-by: Christoph Lameter <clameter@....com>
> 
> ---
>  include/linux/gfp.h     |    1 +
>  kernel/power/snapshot.c |    2 +-
>  mm/page_alloc.c         |    2 +-
>  3 files changed, 3 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.24-rc5-mm1/kernel/power/snapshot.c
> ===================================================================
> --- linux-2.6.24-rc5-mm1.orig/kernel/power/snapshot.c	2007-12-19 11:59:25.233961700 -0800
> +++ linux-2.6.24-rc5-mm1/kernel/power/snapshot.c	2007-12-19 15:16:34.179661929 -0800
> @@ -1203,7 +1203,7 @@ asmlinkage int swsusp_save(void)
>  
>  	printk(KERN_INFO "PM: Creating hibernation image: \n");
>  
> -	drain_all_pages();
> +	drain_local_pages(NULL);
>  	nr_pages = count_data_pages();
>  	nr_highmem = count_highmem_pages();
>  	printk(KERN_INFO "PM: Need to copy %u pages\n", nr_pages + nr_highmem);

You've omitted the second instance, right before the copy_data_pages() call.

> Index: linux-2.6.24-rc5-mm1/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.24-rc5-mm1.orig/mm/page_alloc.c	2007-12-19 12:01:00.630421258 -0800
> +++ linux-2.6.24-rc5-mm1/mm/page_alloc.c	2007-12-19 15:12:19.850545818 -0800
> @@ -930,7 +930,7 @@ static void drain_pages(unsigned int cpu
>  /*
>   * Spill all of this CPU's per-cpu pages back into the buddy allocator.
>   */
> -static void drain_local_pages(void *arg)
> +void drain_local_pages(void *arg)
>  {
>  	drain_pages(smp_processor_id());
>  }
> Index: linux-2.6.24-rc5-mm1/include/linux/gfp.h
> ===================================================================
> --- linux-2.6.24-rc5-mm1.orig/include/linux/gfp.h	2007-12-19 15:13:51.926950065 -0800
> +++ linux-2.6.24-rc5-mm1/include/linux/gfp.h	2007-12-19 15:16:11.951564369 -0800
> @@ -229,5 +229,6 @@ extern void FASTCALL(free_cold_page(stru
>  void page_alloc_init(void);
>  void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
>  void drain_all_pages(void);
> +void drain_local_pages(void *dummy);
>  
>  #endif /* __LINUX_GFP_H */
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