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Date: Tue, 2 Oct 2012 16:12:17 +0100
From: Mel Gorman <mgorman@...e.de>
To: Thierry Reding <thierry.reding@...onic-design.de>
Cc: Peter Ujfalusi <peter.ujfalusi@...com>,
Minchan Kim <minchan@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Michal Nazarewicz <mina86@...a86.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: CMA broken in next-20120926
On Tue, Oct 02, 2012 at 05:03:07PM +0200, Thierry Reding wrote:
> On Tue, Oct 02, 2012 at 03:41:35PM +0100, Mel Gorman wrote:
> > On Tue, Oct 02, 2012 at 02:48:14PM +0200, Thierry Reding wrote:
> > > > So this really isn't all that new, but I just wanted to confirm my
> > > > results from last week. We'll see if bisection shows up something
> > > > interesting.
> > >
> > > I just finished bisecting this and git reports:
> > >
> > > 3750280f8bd0ed01753a72542756a8c82ab27933 is the first bad commit
> > >
> > > I'm attaching the complete bisection log and a diff of all the changes
> > > applied on top of the bad commit to make it compile and run on my board.
> > > Most of the patch is probably not important, though. There are two hunks
> > > which have the pageblock changes I already posted an two other hunks
> > > with the patch you posted earlier.
> > >
> > > I hope this helps. If you want me to run any other tests, please let me
> > > know.
> > >
> >
> > Can you test with this on top please?
>
> That doesn't build on top of the bad commit. Or is it supposed to go on
> top of next-20120926?
>
It doesn't build or do you mean it doesn't apply? Assuming the problem
was that it didn't apply then try this one. It applies on top of
next-20120928 which is the closest tag I have to next-20120926.
---8<---
mm: compaction: Cache if a pageblock was scanned and no pages were isolated -fix3
CMA requires that the PG_migrate_skip hint be skipped but it was only
skipping it when isolating pages for migration, not for free. Ensure
cc->isolate_skip_hint gets passed in both cases.
This is a fix for
mm-compaction-cache-if-a-pageblock-was-scanned-and-no-pages-were-isolated-fix.patch
Signed-off-by: Mel Gorman <mgorman@...e.de>
---
mm/compaction.c | 16 ++++------------
mm/internal.h | 3 ++-
mm/page_alloc.c | 26 +++++++++++++-------------
3 files changed, 19 insertions(+), 26 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index f7a5ff5..62697fb 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -345,22 +345,14 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
* a free page).
*/
unsigned long
-isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn)
+isolate_freepages_range(struct compact_control *cc,
+ unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long isolated, pfn, block_end_pfn;
- struct zone *zone = NULL;
LIST_HEAD(freelist);
- /* cc needed for isolate_freepages_block to acquire zone->lock */
- struct compact_control cc = {
- .sync = true,
- };
-
- if (pfn_valid(start_pfn))
- cc.zone = zone = page_zone(pfn_to_page(start_pfn));
-
for (pfn = start_pfn; pfn < end_pfn; pfn += isolated) {
- if (!pfn_valid(pfn) || zone != page_zone(pfn_to_page(pfn)))
+ if (!pfn_valid(pfn) || cc->zone != page_zone(pfn_to_page(pfn)))
break;
/*
@@ -370,7 +362,7 @@ isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn)
block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
block_end_pfn = min(block_end_pfn, end_pfn);
- isolated = isolate_freepages_block(&cc, pfn, block_end_pfn,
+ isolated = isolate_freepages_block(cc, pfn, block_end_pfn,
&freelist, true);
/*
diff --git a/mm/internal.h b/mm/internal.h
index f652660..4ea7497 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -131,7 +131,8 @@ struct compact_control {
};
unsigned long
-isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn);
+isolate_freepages_range(struct compact_control *cc,
+ unsigned long start_pfn, unsigned long end_pfn);
unsigned long
isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
unsigned long low_pfn, unsigned long end_pfn);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e238fa34..6564e93 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5678,23 +5678,15 @@ __alloc_contig_migrate_alloc(struct page *page, unsigned long private,
}
/* [start, end) must belong to a single zone. */
-static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
+static int __alloc_contig_migrate_range(struct compact_control *cc,
+ unsigned long start, unsigned long end)
{
/* This function is based on compact_zone() from compaction.c. */
unsigned long nr_reclaimed;
unsigned long pfn = start;
unsigned int tries = 0;
int ret = 0;
- struct compact_control cc = {
- .nr_migratepages = 0,
- .order = -1,
- .zone = page_zone(pfn_to_page(start)),
- .sync = true,
- .ignore_skip_hint = true,
- };
- INIT_LIST_HEAD(&cc.migratepages);
-
migrate_prep_local();
while (pfn < end || !list_empty(&cc.migratepages)) {
@@ -5803,6 +5794,15 @@ int alloc_contig_range(unsigned long start, unsigned long end,
unsigned long outer_start, outer_end;
int ret = 0, order;
+ struct compact_control cc = {
+ .nr_migratepages = 0,
+ .order = -1,
+ .zone = page_zone(pfn_to_page(start)),
+ .sync = true,
+ .ignore_skip_hint = true,
+ };
+ INIT_LIST_HEAD(&cc.migratepages);
+
/*
* What we do here is we mark all pageblocks in range as
* MIGRATE_ISOLATE. Because pageblock and max order pages may
@@ -5832,7 +5832,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
if (ret)
goto done;
- ret = __alloc_contig_migrate_range(start, end);
+ ret = __alloc_contig_migrate_range(cc, start, end);
if (ret)
goto done;
@@ -5881,7 +5881,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
__reclaim_pages(zone, GFP_HIGHUSER_MOVABLE, end-start);
/* Grab isolated pages from freelists. */
- outer_end = isolate_freepages_range(outer_start, end);
+ outer_end = isolate_freepages_range(cc, outer_start, end);
if (!outer_end) {
ret = -EBUSY;
goto done;
--
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