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-rw-r--r--drivers/xen/xen-selfballoon.c67
1 files changed, 63 insertions, 4 deletions
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 1b4afd81f872..ff3f2e423af4 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -68,6 +68,8 @@
*/
#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/workqueue.h>
@@ -92,6 +94,15 @@ static unsigned int selfballoon_uphysteresis __read_mostly = 1;
/* In HZ, controls frequency of worker invocation. */
static unsigned int selfballoon_interval __read_mostly = 5;
+/*
+ * Minimum usable RAM in MB for selfballooning target for balloon.
+ * If non-zero, it is added to totalreserve_pages and self-ballooning
+ * will not balloon below the sum. If zero, a piecewise linear function
+ * is calculated as a minimum and added to totalreserve_pages. Note that
+ * setting this value indiscriminately may cause OOMs and crashes.
+ */
+static unsigned int selfballoon_min_usable_mb;
+
static void selfballoon_process(struct work_struct *work);
static DECLARE_DELAYED_WORK(selfballoon_worker, selfballoon_process);
@@ -188,20 +199,23 @@ static int __init xen_selfballooning_setup(char *s)
__setup("selfballooning", xen_selfballooning_setup);
#endif /* CONFIG_FRONTSWAP */
+#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
+
/*
* Use current balloon size, the goal (vm_committed_as), and hysteresis
* parameters to set a new target balloon size
*/
static void selfballoon_process(struct work_struct *work)
{
- unsigned long cur_pages, goal_pages, tgt_pages;
+ unsigned long cur_pages, goal_pages, tgt_pages, floor_pages;
+ unsigned long useful_pages;
bool reset_timer = false;
if (xen_selfballooning_enabled) {
- cur_pages = balloon_stats.current_pages;
+ cur_pages = totalram_pages;
tgt_pages = cur_pages; /* default is no change */
goal_pages = percpu_counter_read_positive(&vm_committed_as) +
- balloon_stats.current_pages - totalram_pages;
+ totalreserve_pages;
#ifdef CONFIG_FRONTSWAP
/* allow space for frontswap pages to be repatriated */
if (frontswap_selfshrinking && frontswap_enabled)
@@ -216,7 +230,26 @@ static void selfballoon_process(struct work_struct *work)
((goal_pages - cur_pages) /
selfballoon_uphysteresis);
/* else if cur_pages == goal_pages, no change */
- balloon_set_new_target(tgt_pages);
+ useful_pages = max_pfn - totalreserve_pages;
+ if (selfballoon_min_usable_mb != 0)
+ floor_pages = totalreserve_pages +
+ MB2PAGES(selfballoon_min_usable_mb);
+ /* piecewise linear function ending in ~3% slope */
+ else if (useful_pages < MB2PAGES(16))
+ floor_pages = max_pfn; /* not worth ballooning */
+ else if (useful_pages < MB2PAGES(64))
+ floor_pages = totalreserve_pages + MB2PAGES(16) +
+ ((useful_pages - MB2PAGES(16)) >> 1);
+ else if (useful_pages < MB2PAGES(512))
+ floor_pages = totalreserve_pages + MB2PAGES(40) +
+ ((useful_pages - MB2PAGES(40)) >> 3);
+ else /* useful_pages >= MB2PAGES(512) */
+ floor_pages = totalreserve_pages + MB2PAGES(99) +
+ ((useful_pages - MB2PAGES(99)) >> 5);
+ if (tgt_pages < floor_pages)
+ tgt_pages = floor_pages;
+ balloon_set_new_target(tgt_pages +
+ balloon_stats.current_pages - totalram_pages);
reset_timer = true;
}
#ifdef CONFIG_FRONTSWAP
@@ -339,6 +372,31 @@ static ssize_t store_selfballoon_uphys(struct sys_device *dev,
static SYSDEV_ATTR(selfballoon_uphysteresis, S_IRUGO | S_IWUSR,
show_selfballoon_uphys, store_selfballoon_uphys);
+SELFBALLOON_SHOW(selfballoon_min_usable_mb, "%d\n",
+ selfballoon_min_usable_mb);
+
+static ssize_t store_selfballoon_min_usable_mb(struct sys_device *dev,
+ struct sysdev_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ unsigned long val;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ err = strict_strtoul(buf, 10, &val);
+ if (err || val == 0)
+ return -EINVAL;
+ selfballoon_min_usable_mb = val;
+ return count;
+}
+
+static SYSDEV_ATTR(selfballoon_min_usable_mb, S_IRUGO | S_IWUSR,
+ show_selfballoon_min_usable_mb,
+ store_selfballoon_min_usable_mb);
+
+
#ifdef CONFIG_FRONTSWAP
SELFBALLOON_SHOW(frontswap_selfshrinking, "%d\n", frontswap_selfshrinking);
@@ -420,6 +478,7 @@ static struct attribute *selfballoon_attrs[] = {
&attr_selfballoon_interval.attr,
&attr_selfballoon_downhysteresis.attr,
&attr_selfballoon_uphysteresis.attr,
+ &attr_selfballoon_min_usable_mb.attr,
#ifdef CONFIG_FRONTSWAP
&attr_frontswap_selfshrinking.attr,
&attr_frontswap_hysteresis.attr,