summaryrefslogtreecommitdiffstats
path: root/drivers/xen/balloon.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/xen/balloon.c')
-rw-r--r--drivers/xen/balloon.c38
1 files changed, 9 insertions, 29 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d31505b..4204336 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -66,8 +66,6 @@ struct balloon_stats {
/* We aim for 'current allocation' == 'target allocation'. */
unsigned long current_pages;
unsigned long target_pages;
- /* We may hit the hard limit in Xen. If we do then we remember it. */
- unsigned long hard_limit;
/*
* Drivers may alter the memory reservation independently, but they
* must inform the balloon driver so we avoid hitting the hard limit.
@@ -136,6 +134,8 @@ static void balloon_append(struct page *page)
list_add(&page->lru, &ballooned_pages);
balloon_stats.balloon_low++;
}
+
+ totalram_pages--;
}
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
@@ -156,6 +156,8 @@ static struct page *balloon_retrieve(void)
else
balloon_stats.balloon_low--;
+ totalram_pages++;
+
return page;
}
@@ -181,7 +183,7 @@ static void balloon_alarm(unsigned long unused)
static unsigned long current_target(void)
{
- unsigned long target = min(balloon_stats.target_pages, balloon_stats.hard_limit);
+ unsigned long target = balloon_stats.target_pages;
target = min(target,
balloon_stats.current_pages +
@@ -217,23 +219,10 @@ static int increase_reservation(unsigned long nr_pages)
set_xen_guest_handle(reservation.extent_start, frame_list);
reservation.nr_extents = nr_pages;
rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
- if (rc < nr_pages) {
- if (rc > 0) {
- int ret;
-
- /* We hit the Xen hard limit: reprobe. */
- reservation.nr_extents = rc;
- ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
- &reservation);
- BUG_ON(ret != rc);
- }
- if (rc >= 0)
- balloon_stats.hard_limit = (balloon_stats.current_pages + rc -
- balloon_stats.driver_pages);
+ if (rc < 0)
goto out;
- }
- for (i = 0; i < nr_pages; i++) {
+ for (i = 0; i < rc; i++) {
page = balloon_retrieve();
BUG_ON(page == NULL);
@@ -259,13 +248,12 @@ static int increase_reservation(unsigned long nr_pages)
__free_page(page);
}
- balloon_stats.current_pages += nr_pages;
- totalram_pages = balloon_stats.current_pages;
+ balloon_stats.current_pages += rc;
out:
spin_unlock_irqrestore(&balloon_lock, flags);
- return 0;
+ return rc < 0 ? rc : rc != nr_pages;
}
static int decrease_reservation(unsigned long nr_pages)
@@ -323,7 +311,6 @@ static int decrease_reservation(unsigned long nr_pages)
BUG_ON(ret != nr_pages);
balloon_stats.current_pages -= nr_pages;
- totalram_pages = balloon_stats.current_pages;
spin_unlock_irqrestore(&balloon_lock, flags);
@@ -367,7 +354,6 @@ static void balloon_process(struct work_struct *work)
static void balloon_set_new_target(unsigned long target)
{
/* No need for lock. Not read-modify-write updates. */
- balloon_stats.hard_limit = ~0UL;
balloon_stats.target_pages = target;
schedule_work(&balloon_worker);
}
@@ -422,12 +408,10 @@ static int __init balloon_init(void)
pr_info("xen_balloon: Initialising balloon driver.\n");
balloon_stats.current_pages = min(xen_start_info->nr_pages, max_pfn);
- totalram_pages = balloon_stats.current_pages;
balloon_stats.target_pages = balloon_stats.current_pages;
balloon_stats.balloon_low = 0;
balloon_stats.balloon_high = 0;
balloon_stats.driver_pages = 0UL;
- balloon_stats.hard_limit = ~0UL;
init_timer(&balloon_timer);
balloon_timer.data = 0;
@@ -472,9 +456,6 @@ module_exit(balloon_exit);
BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(balloon_stats.current_pages));
BALLOON_SHOW(low_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_low));
BALLOON_SHOW(high_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_high));
-BALLOON_SHOW(hard_limit_kb,
- (balloon_stats.hard_limit!=~0UL) ? "%lu\n" : "???\n",
- (balloon_stats.hard_limit!=~0UL) ? PAGES2KB(balloon_stats.hard_limit) : 0);
BALLOON_SHOW(driver_kb, "%lu\n", PAGES2KB(balloon_stats.driver_pages));
static ssize_t show_target_kb(struct sys_device *dev, struct sysdev_attribute *attr,
@@ -544,7 +525,6 @@ static struct attribute *balloon_info_attrs[] = {
&attr_current_kb.attr,
&attr_low_kb.attr,
&attr_high_kb.attr,
- &attr_hard_limit_kb.attr,
&attr_driver_kb.attr,
NULL
};
OpenPOWER on IntegriCloud