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Message-Id: <200607282042.51831.rjw@sisk.pl>
Date: Fri, 28 Jul 2006 20:42:51 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Al Boldi <a1426z@...ab.com>
Cc: linux-kernel@...r.kernel.org
Subject: Re: swsusp hangs on headless resume-from-ram
On Friday 28 July 2006 16:23, Rafael J. Wysocki wrote:
> On Friday 28 July 2006 15:58, Al Boldi wrote:
> > Rafael J. Wysocki wrote:
> > > On Wednesday 26 July 2006 23:34, Al Boldi wrote:
> > > > Rafael J. Wysocki wrote:
> > > > > On Wednesday 26 July 2006 21:06, Al Boldi wrote:
> > > > > > swsusp is really great, most of the time. But sometimes it hangs
> > > > > > after coming out of STR. I suspect it's got something to do with
> > > > > > display access, as this problem seems hw related. So I removed the
> > > > > > display card, and it positively does not resume from ram on 2.6.16+.
> > > > > >
> > > > > > Any easy fix for this?
> > > > >
> > > > > I have one idea, but you'll need a patch to test. I'll try to prepare
> > > > > it tomorrow.
> > > > >
> > > > > I guess your box is an i386?
> > > >
> > > > That should be assumed by default :)
> > >
> > > I had hoped I would be able to test it somewhere, but I couldn't. I hope
> > > it will compile. :-)
> > >
> > > If it does, please send me the output of dmesg after a fresh boot.
> >
> > See attached. patched against 2.6.17.
>
> Well, the nosave ranges are the same in both cases, so it doesn't look
> very promising.
>
> Have you tried to suspend with the patch applied?
Ouch, sorry, it won't work. It will have a chance to work with the appended
patch applied.
However, I've just noticed you said it didn't resume from RAM and these
two patches could only fix the resume from disk. ;-) As far as the
resume from RAM is concerned, I can only advise you to use a
newest possible kernel and see if the problem is still there.
Greetings,
Rafael
---
kernel/power/snapshot.c | 62 ++++++++++++++++++++++++------------------------
1 files changed, 32 insertions(+), 30 deletions(-)
Index: linux-2.6.18-rc1/kernel/power/snapshot.c
===================================================================
--- linux-2.6.18-rc1.orig/kernel/power/snapshot.c 2006-07-09 19:48:05.000000000 +0200
+++ linux-2.6.18-rc1/kernel/power/snapshot.c 2006-07-09 20:26:19.000000000 +0200
@@ -156,7 +156,7 @@ static inline int save_highmem(void) {re
static inline int restore_highmem(void) {return 0;}
#endif
-static int pfn_is_nosave(unsigned long pfn)
+static inline int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
@@ -167,43 +167,43 @@ static int pfn_is_nosave(unsigned long p
* saveable - Determine whether a page should be cloned or not.
* @pfn: The page
*
- * We save a page if it's Reserved, and not in the range of pages
- * statically defined as 'unsaveable', or if it isn't reserved, and
- * isn't part of a free chunk of pages.
+ * We save a page if it isn't Nosave, and is not in the range of pages
+ * statically defined as 'unsaveable', and it
+ * isn't a part of a free chunk of pages.
*/
-static int saveable(struct zone *zone, unsigned long *zone_pfn)
+static struct page *saveable_page(unsigned long pfn)
{
- unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
struct page *page;
if (!pfn_valid(pfn))
- return 0;
+ return NULL;
page = pfn_to_page(pfn);
- BUG_ON(PageReserved(page) && PageNosave(page));
+
if (PageNosave(page))
- return 0;
+ return NULL;
if (PageReserved(page) && pfn_is_nosave(pfn))
- return 0;
+ return NULL;
if (PageNosaveFree(page))
- return 0;
+ return NULL;
- return 1;
+ return page;
}
unsigned int count_data_pages(void)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
for_each_zone (zone) {
if (is_highmem(zone))
continue;
mark_free_pages(zone);
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- n += saveable(zone, &zone_pfn);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ n += !!saveable_page(pfn);
}
return n;
}
@@ -211,7 +211,7 @@ unsigned int count_data_pages(void)
static void copy_data_pages(struct pbe *pblist)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
struct pbe *pbe, *p;
pbe = pblist;
@@ -224,13 +224,14 @@ static void copy_data_pages(struct pbe *
SetPageNosaveFree(virt_to_page(p));
for_each_pbe (p, pblist)
SetPageNosaveFree(virt_to_page(p->address));
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
- if (saveable(zone, &zone_pfn)) {
- struct page *page;
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
+ struct page *page = saveable_page(pfn);
+
+ if (page) {
long *src, *dst;
int n;
- page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
BUG_ON(!pbe);
pbe->orig_address = (unsigned long)page_address(page);
/* copy_page and memcpy are not usable for copying task structs. */
@@ -383,13 +384,14 @@ static struct pbe *alloc_pagedir(unsigne
void swsusp_free(void)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
for_each_zone(zone) {
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- if (pfn_valid(zone_pfn + zone->zone_start_pfn)) {
- struct page *page;
- page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (pfn_valid(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+
if (PageNosave(page) && PageNosaveFree(page)) {
ClearPageNosave(page);
ClearPageNosaveFree(page);
@@ -598,7 +600,7 @@ int snapshot_read_next(struct snapshot_h
static int mark_unsafe_pages(struct pbe *pblist)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
struct pbe *p;
if (!pblist) /* a sanity check */
@@ -606,10 +608,10 @@ static int mark_unsafe_pages(struct pbe
/* Clear page flags */
for_each_zone (zone) {
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- if (pfn_valid(zone_pfn + zone->zone_start_pfn))
- ClearPageNosaveFree(pfn_to_page(zone_pfn +
- zone->zone_start_pfn));
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (pfn_valid(pfn))
+ ClearPageNosaveFree(pfn_to_page(pfn));
}
/* Mark orig addresses */
-
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