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Date: Fri, 24 Jul 2015 12:47:45 +0100
From: David Vrabel <david.vrabel@...rix.com>
To: <xen-devel@...ts.xenproject.org>
CC: David Vrabel <david.vrabel@...rix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
Daniel Kiper <daniel.kiper@...cle.com>
Subject: [PATCHv2 07/10] xen/balloon: make alloc_xenballoon_pages() always allocate low pages
All users of alloc_xenballoon_pages() wanted low memory pages, so
remove the option for high memory.
Signed-off-by: David Vrabel <david.vrabel@...rix.com>
Reviewed-by: Daniel Kiper <daniel.kiper@...cle.com>
---
arch/x86/xen/grant-table.c | 2 +-
drivers/xen/balloon.c | 21 ++++++++-------------
drivers/xen/grant-table.c | 2 +-
drivers/xen/privcmd.c | 2 +-
drivers/xen/xenbus/xenbus_client.c | 3 +--
include/xen/balloon.h | 3 +--
6 files changed, 13 insertions(+), 20 deletions(-)
diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
index 1580e7a..e079500 100644
--- a/arch/x86/xen/grant-table.c
+++ b/arch/x86/xen/grant-table.c
@@ -133,7 +133,7 @@ static int __init xlated_setup_gnttab_pages(void)
kfree(pages);
return -ENOMEM;
}
- rc = alloc_xenballooned_pages(nr_grant_frames, pages, 0 /* lowmem */);
+ rc = alloc_xenballooned_pages(nr_grant_frames, pages);
if (rc) {
pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
nr_grant_frames, rc);
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index ced34cd..cc68a4d 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -136,17 +136,16 @@ static void balloon_append(struct page *page)
}
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
-static struct page *balloon_retrieve(bool prefer_highmem)
+static struct page *balloon_retrieve(bool require_lowmem)
{
struct page *page;
if (list_empty(&ballooned_pages))
return NULL;
- if (prefer_highmem)
- page = list_entry(ballooned_pages.prev, struct page, lru);
- else
- page = list_entry(ballooned_pages.next, struct page, lru);
+ page = list_entry(ballooned_pages.next, struct page, lru);
+ if (require_lowmem && PageHighMem(page))
+ return NULL;
list_del(&page->lru);
if (PageHighMem(page))
@@ -533,24 +532,20 @@ EXPORT_SYMBOL_GPL(balloon_set_new_target);
* alloc_xenballooned_pages - get pages that have been ballooned out
* @nr_pages: Number of pages to get
* @pages: pages returned
- * @highmem: allow highmem pages
* @return 0 on success, error otherwise
*/
-int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
+int alloc_xenballooned_pages(int nr_pages, struct page **pages)
{
int pgno = 0;
struct page *page;
mutex_lock(&balloon_mutex);
while (pgno < nr_pages) {
- page = balloon_retrieve(highmem);
- if (page && (highmem || !PageHighMem(page))) {
+ page = balloon_retrieve(true);
+ if (page) {
pages[pgno++] = page;
} else {
enum bp_state st;
- if (page)
- balloon_append(page);
- st = decrease_reservation(nr_pages - pgno,
- highmem ? GFP_HIGHUSER : GFP_USER);
+ st = decrease_reservation(nr_pages - pgno, GFP_USER);
if (st != BP_DONE)
goto out_undo;
}
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 62f591f..a4b702c 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -687,7 +687,7 @@ int gnttab_alloc_pages(int nr_pages, struct page **pages)
int i;
int ret;
- ret = alloc_xenballooned_pages(nr_pages, pages, false);
+ ret = alloc_xenballooned_pages(nr_pages, pages);
if (ret < 0)
return ret;
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 5a29616..59cfec9 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -401,7 +401,7 @@ static int alloc_empty_pages(struct vm_area_struct *vma, int numpgs)
if (pages == NULL)
return -ENOMEM;
- rc = alloc_xenballooned_pages(numpgs, pages, 0);
+ rc = alloc_xenballooned_pages(numpgs, pages);
if (rc != 0) {
pr_warn("%s Could not alloc %d pfns rc:%d\n", __func__,
numpgs, rc);
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 9ad3272..2a2da04 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -614,8 +614,7 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
if (!node)
return -ENOMEM;
- err = alloc_xenballooned_pages(nr_grefs, node->hvm.pages,
- false /* lowmem */);
+ err = alloc_xenballooned_pages(nr_grefs, node->hvm.pages);
if (err)
goto out_err;
diff --git a/include/xen/balloon.h b/include/xen/balloon.h
index c8aee7a..83efdeb 100644
--- a/include/xen/balloon.h
+++ b/include/xen/balloon.h
@@ -22,8 +22,7 @@ extern struct balloon_stats balloon_stats;
void balloon_set_new_target(unsigned long target);
-int alloc_xenballooned_pages(int nr_pages, struct page **pages,
- bool highmem);
+int alloc_xenballooned_pages(int nr_pages, struct page **pages);
void free_xenballooned_pages(int nr_pages, struct page **pages);
struct device;
--
2.1.4
--
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