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Date: Tue, 5 Mar 2013 22:55:15 +0800
From: Jiang Liu <liuj97@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
David Rientjes <rientjes@...gle.com>
Cc: Jiang Liu <jiang.liu@...wei.com>,
Wen Congyang <wency@...fujitsu.com>,
Maciej Rutecki <maciej.rutecki@...il.com>,
Chris Clayton <chris2553@...glemail.com>,
"Rafael J . Wysocki" <rjw@...k.pl>, Mel Gorman <mgorman@...e.de>,
Minchan Kim <minchan@...nel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Michal Hocko <mhocko@...e.cz>,
Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
Rusty Russell <rusty@...tcorp.com.au>,
"Michael S. Tsirkin" <mst@...hat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Tang Chen <tangchen@...fujitsu.com>,
Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
virtualization@...ts.linux-foundation.org,
xen-devel@...ts.xensource.com
Subject: [RFC PATCH v1 32/33] mm: correctly update zone->mamaged_pages
Enhance adjust_managed_page_count() to adjust totalhigh_pages for
highmem pages. And change code which directly adjusts totalram_pages
to use adjust_managed_page_count() because it adjusts totalram_pages,
totalhigh_pages and zone->managed_pages altogether in a safe way.
Remove inc_totalhigh_pages() and dec_totalhigh_pages() from xen/balloon
driver bacause adjust_managed_page_count() has already adjusted
totalhigh_pages. This patch also enhances virtio_balloon driver to
adjust totalhigh_pages when reserve/unreserve pages.
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Chris Metcalf <cmetcalf@...era.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Wen Congyang <wency@...fujitsu.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Tang Chen <tangchen@...fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Minchan Kim <minchan@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org
Cc: xen-devel@...ts.xensource.com
Cc: linux-mm@...ck.org
---
arch/tile/mm/init.c | 4 ++--
drivers/virtio/virtio_balloon.c | 8 +++++---
drivers/xen/balloon.c | 19 ++++---------------
mm/hugetlb.c | 2 +-
mm/memory_hotplug.c | 15 +++------------
mm/page_alloc.c | 6 ++++++
6 files changed, 21 insertions(+), 33 deletions(-)
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index 2749515..5886aef 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -720,7 +720,7 @@ static void __init init_free_pfn_range(unsigned long start, unsigned long end)
}
init_page_count(page);
__free_pages(page, order);
- totalram_pages += count;
+ adjust_managed_page_count(page, count);
page += count;
pfn += count;
@@ -1033,7 +1033,7 @@ static void free_init_pages(char *what, unsigned long begin, unsigned long end)
pfn_pte(pfn, PAGE_KERNEL));
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
free_page(addr);
- totalram_pages++;
+ adjust_managed_page_count(page, 1);
}
pr_info("Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 8dab163..4c6ec53 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -148,7 +148,7 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
}
set_page_pfns(vb->pfns + vb->num_pfns, page);
vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE;
- totalram_pages--;
+ adjust_managed_page_count(page, -1);
}
/* Did we get any? */
@@ -160,11 +160,13 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
{
unsigned int i;
+ struct page *page;
/* Find pfns pointing at start of each page, get pages and free them. */
for (i = 0; i < num; i += VIRTIO_BALLOON_PAGES_PER_PAGE) {
- balloon_page_free(balloon_pfn_to_page(pfns[i]));
- totalram_pages++;
+ page = balloon_pfn_to_page(pfns[i]);
+ balloon_page_free(page);
+ adjust_managed_page_count(page, 1);
}
}
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a56776d..a5fdbcc 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats);
/* We increase/decrease in batches which fit in a page */
static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)];
-#ifdef CONFIG_HIGHMEM
-#define inc_totalhigh_pages() (totalhigh_pages++)
-#define dec_totalhigh_pages() (totalhigh_pages--)
-#else
-#define inc_totalhigh_pages() do {} while (0)
-#define dec_totalhigh_pages() do {} while (0)
-#endif
-
/* List of ballooned pages, threaded through the mem_map array. */
static LIST_HEAD(ballooned_pages);
@@ -132,9 +124,7 @@ static void __balloon_append(struct page *page)
static void balloon_append(struct page *page)
{
__balloon_append(page);
- if (PageHighMem(page))
- dec_totalhigh_pages();
- totalram_pages--;
+ adjust_managed_page_count(page, -1);
}
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
@@ -151,13 +141,12 @@ static struct page *balloon_retrieve(bool prefer_highmem)
page = list_entry(ballooned_pages.next, struct page, lru);
list_del(&page->lru);
- if (PageHighMem(page)) {
+ if (PageHighMem(page))
balloon_stats.balloon_high--;
- inc_totalhigh_pages();
- } else
+ else
balloon_stats.balloon_low--;
- totalram_pages++;
+ adjust_managed_page_count(page, 1);
return page;
}
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0a0be33..a381818 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1246,7 +1246,7 @@ static void __init gather_bootmem_prealloc(void)
* side-effects, like CommitLimit going negative.
*/
if (h->order > (MAX_ORDER - 1))
- totalram_pages += 1 << h->order;
+ adjust_managed_page_count(page, 1 << h->order);
}
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index af9e87f..f9ce564 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -760,20 +760,13 @@ EXPORT_SYMBOL_GPL(__online_page_set_limits);
void __online_page_increment_counters(struct page *page)
{
- totalram_pages++;
-
-#ifdef CONFIG_HIGHMEM
- if (PageHighMem(page))
- totalhigh_pages++;
-#endif
+ adjust_managed_page_count(page, 1);
}
EXPORT_SYMBOL_GPL(__online_page_increment_counters);
void __online_page_free(struct page *page)
{
- ClearPageReserved(page);
- init_page_count(page);
- __free_page(page);
+ __free_reserved_page(page);
}
EXPORT_SYMBOL_GPL(__online_page_free);
@@ -970,7 +963,6 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
return ret;
}
- zone->managed_pages += onlined_pages;
zone->present_pages += onlined_pages;
zone->zone_pgdat->node_present_pages += onlined_pages;
if (onlined_pages) {
@@ -1554,10 +1546,9 @@ repeat:
/* reset pagetype flags and makes migrate type to be MOVABLE */
undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
/* removal success */
- zone->managed_pages -= offlined_pages;
+ adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages);
zone->present_pages -= offlined_pages;
zone->zone_pgdat->node_present_pages -= offlined_pages;
- totalram_pages -= offlined_pages;
init_per_zone_wmark_min();
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d252443..041eb92 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -780,7 +780,9 @@ void __init init_cma_reserved_pageblock(struct page *page)
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
totalhigh_pages += pageblock_nr_pages;
+ else
#endif
+ page_zone(page)->managed_pages += pageblock_nr_pages;
}
#endif
@@ -5119,6 +5121,10 @@ void adjust_managed_page_count(struct page *page, long count)
page_zone(page)->managed_pages += count;
totalram_pages += count;
+#ifdef CONFIG_HIGHMEM
+ if (PageHighMem(page))
+ totalhigh_pages += count;
+#endif
if (lock)
spin_unlock(&managed_page_count_lock);
--
1.7.9.5
--
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