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 <[email protected]>
>
> ---
> 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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