(2013/02/22 19:30), Glauber Costa wrote: > After we create a boot cache, we may allocate from it until it is bootstraped. > This will move the page from the partial list to the cpu slab list. If this > happens, the loop: > > list_for_each_entry(p, &n->partial, lru) > > that we use to scan for all partial pages will yield nothing, and the pages > will keep pointing to the boot cpu cache, which is of course, invalid. To do > that, we should flush the cache to make sure that the cpu slab is back to the > partial list. > > Although not verified in practice, I also point out that it is not safe to scan > the full list only when debugging is on in this case. As unlikely as it is, it > is theoretically possible for the pages to be full. If they are, they will > become unreachable. Aside from scanning the full list, we also need to make > sure that the pages indeed sit in there: the easiest way to do it is to make > sure the boot caches have the SLAB_STORE_USER debug flag set. > > Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > Reported-by: Steffen Michalke <StMichalke@xxxxxx> > Cc: Christoph Lameter <cl@xxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Tejun Heo <tj@xxxxxxxxxx> > Cc: Pekka Enberg <penberg@xxxxxxxxxx> > Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > You're quick :) the issue is fixed in my environ. Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu,com> -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>