On 01/17/2012 04:27 AM, Pekka Enberg wrote:
On Tue, Jan 17, 2012 at 10:13 AM, Minchan Kim<minchan@xxxxxxxxxx> wrote:+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... -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>