On 01/17/2012 04:27 AM, Pekka Enberg wrote:

On Tue, Jan 17, 2012 at 10:13 AM, Minchan Kim[off-list ref]  wrote:

quoted

+static unsigned int low_mem_notify_poll(struct file *file, poll_table *wait)
+{
+        unsigned int ret = 0;
+
+        poll_wait(file,&low_mem_wait, wait);
+
+        if (atomic_read(&nr_low_mem) != 0) {
+                ret = POLLIN;
+                atomic_set(&nr_low_mem, 0);
+        }
+
+        return ret;
+}

Doesn't this mean that only one application will receive the notification?

One at a time, which could be a good thing since the last
thing we want to do when the system is under memory
pressure is create a thundering herd.

OTOH, we do need to ensure that programs take turns getting
the memory pressure notification.  I do not know whether
poll_wait automatically takes care of that...

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