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-rw-r--r--mm/pdflush.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/pdflush.c b/mm/pdflush.c
index d6781951267e..52822c98c489 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -20,6 +20,7 @@
#include <linux/fs.h> // Needed by writeback.h
#include <linux/writeback.h> // Prototypes pdflush_operation()
#include <linux/kthread.h>
+#include <linux/cpuset.h>
/*
@@ -170,12 +171,24 @@ static int __pdflush(struct pdflush_work *my_work)
static int pdflush(void *dummy)
{
struct pdflush_work my_work;
+ cpumask_t cpus_allowed;
/*
* pdflush can spend a lot of time doing encryption via dm-crypt. We
* don't want to do that at keventd's priority.
*/
set_user_nice(current, 0);
+
+ /*
+ * Some configs put our parent kthread in a limited cpuset,
+ * which kthread() overrides, forcing cpus_allowed == CPU_MASK_ALL.
+ * Our needs are more modest - cut back to our cpusets cpus_allowed.
+ * This is needed as pdflush's are dynamically created and destroyed.
+ * The boottime pdflush's are easily placed w/o these 2 lines.
+ */
+ cpus_allowed = cpuset_cpus_allowed(current);
+ set_cpus_allowed(current, cpus_allowed);
+
return __pdflush(&my_work);
}