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[PATCH] xen/balloon: use a kernel thread instead a workqueue



Today the Xen ballooning is done via delayed work in a workqueue. This
might result in workqueue hangups being reported in case of large
amounts of memory are being ballooned in one go (here 16GB):

BUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
    in-flight: 229:balloon_process
    pending: cache_reap
workqueue events_freezable_power_: flags=0x84
  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: disk_events_workfn
workqueue mm_percpu_wq: flags=0x8
  pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: vmstat_update
pool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43

This can easily be avoided by using a dedicated kernel thread for doing
the ballooning work.

Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 drivers/xen/balloon.c | 62 +++++++++++++++++++++++++++++++------------
 1 file changed, 45 insertions(+), 17 deletions(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 671c71245a7b..2d2803883306 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -43,6 +43,8 @@
 #include <linux/sched.h>
 #include <linux/cred.h>
 #include <linux/errno.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
 #include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/pagemap.h>
@@ -115,7 +117,7 @@ static struct ctl_table xen_root[] = {
 #define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1)
 
 /*
- * balloon_process() state:
+ * balloon_thread() state:
  *
  * BP_DONE: done or nothing to do,
  * BP_WAIT: wait to be rescheduled,
@@ -130,6 +132,8 @@ enum bp_state {
        BP_ECANCELED
 };
 
+/* Main waiting point for xen-balloon thread. */
+static DECLARE_WAIT_QUEUE_HEAD(balloon_thread_wq);
 
 static DEFINE_MUTEX(balloon_mutex);
 
@@ -144,10 +148,6 @@ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(xen_pfn_t)];
 static LIST_HEAD(ballooned_pages);
 static DECLARE_WAIT_QUEUE_HEAD(balloon_wq);
 
-/* Main work function, always executed in process context. */
-static void balloon_process(struct work_struct *work);
-static DECLARE_DELAYED_WORK(balloon_worker, balloon_process);
-
 /* When ballooning out (allocating memory to return to Xen) we don't really
    want the kernel to try too hard since that can trigger the oom killer. */
 #define GFP_BALLOON \
@@ -366,7 +366,7 @@ static void xen_online_page(struct page *page, unsigned int 
order)
 static int xen_memory_notifier(struct notifier_block *nb, unsigned long val, 
void *v)
 {
        if (val == MEM_ONLINE)
-               schedule_delayed_work(&balloon_worker, 0);
+               wake_up(&balloon_thread_wq);
 
        return NOTIFY_OK;
 }
@@ -491,18 +491,43 @@ static enum bp_state decrease_reservation(unsigned long 
nr_pages, gfp_t gfp)
 }
 
 /*
- * As this is a work item it is guaranteed to run as a single instance only.
+ * Stop waiting if either state is not BP_EAGAIN and ballooning action is
+ * needed, or if the credit has changed while state is BP_EAGAIN.
+ */
+static bool balloon_thread_cond(enum bp_state state, long credit)
+{
+       if (state != BP_EAGAIN)
+               credit = 0;
+
+       return current_credit() != credit || kthread_should_stop();
+}
+
+/*
+ * As this is a kthread it is guaranteed to run as a single instance only.
  * We may of course race updates of the target counts (which are protected
  * by the balloon lock), or with changes to the Xen hard limit, but we will
  * recover from these in time.
  */
-static void balloon_process(struct work_struct *work)
+static int balloon_thread(void *unused)
 {
        enum bp_state state = BP_DONE;
        long credit;
+       unsigned long timeout;
+
+       set_freezable();
+       for (;;) {
+               if (state == BP_EAGAIN)
+                       timeout = balloon_stats.schedule_delay * HZ;
+               else
+                       timeout = 3600 * HZ;
+               credit = current_credit();
 
+               wait_event_interruptible_timeout(balloon_thread_wq,
+                                balloon_thread_cond(state, credit), timeout);
+
+               if (kthread_should_stop())
+                       return 0;
 
-       do {
                mutex_lock(&balloon_mutex);
 
                credit = current_credit();
@@ -529,12 +554,7 @@ static void balloon_process(struct work_struct *work)
                mutex_unlock(&balloon_mutex);
 
                cond_resched();
-
-       } while (credit && state == BP_DONE);
-
-       /* Schedule more work if there is some still to be done. */
-       if (state == BP_EAGAIN)
-               schedule_delayed_work(&balloon_worker, 
balloon_stats.schedule_delay * HZ);
+       }
 }
 
 /* Resets the Xen limit, sets new target, and kicks off processing. */
@@ -542,7 +562,7 @@ void balloon_set_new_target(unsigned long target)
 {
        /* No need for lock. Not read-modify-write updates. */
        balloon_stats.target_pages = target;
-       schedule_delayed_work(&balloon_worker, 0);
+       wake_up(&balloon_thread_wq);
 }
 EXPORT_SYMBOL_GPL(balloon_set_new_target);
 
@@ -647,7 +667,7 @@ void free_xenballooned_pages(int nr_pages, struct page 
**pages)
 
        /* The balloon may be too large now. Shrink it if needed. */
        if (current_credit())
-               schedule_delayed_work(&balloon_worker, 0);
+               wake_up(&balloon_thread_wq);
 
        mutex_unlock(&balloon_mutex);
 }
@@ -679,6 +699,8 @@ static void __init balloon_add_region(unsigned long 
start_pfn,
 
 static int __init balloon_init(void)
 {
+       struct task_struct *task;
+
        if (!xen_domain())
                return -ENODEV;
 
@@ -722,6 +744,12 @@ static int __init balloon_init(void)
        }
 #endif
 
+       task = kthread_run(balloon_thread, NULL, "xen-balloon");
+       if (IS_ERR(task)) {
+               pr_err("xen-balloon thread could not be started, ballooning 
will not work!\n");
+               return PTR_ERR(task);
+       }
+
        /* Init the xen-balloon driver. */
        xen_balloon_init();
 
-- 
2.26.2




 


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