Thanks Johannes. It makes sense. I was searching for any code in which pages is on free list and being operated with lru_lock. But as you said only pages on LRU lists are operated by lru_lock. I am facing a panic in __rmqueue at list_del where the struct page is corrupted or probably the free_list is corrupted. The kernel is 2.6.32.43.xxx from SLES11SP1. I will first see if any of the other code (proprietary) running is not broken. - Rajesh On Sat, Aug 20, 2011 at 6:57 PM, Johannes Weiner <jweiner@xxxxxxxxxx> wrote: > On Sat, Aug 20, 2011 at 02:11:53AM +0530, Rajesh Ghanekar wrote: >> Hi, >> I am confused with what protects page->lru? Is it both zone->lru_lock or >> zone->lock? I can see it being protected either by lru_lock or lock. > > It's not so much about page->lru but the actual list the page is > linked to. > > The zone's lists of unallocated pages are protected by zone->lock, > while the LRU lists with the pages for userspace are protected by > zone->lru_lock. > -- 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