On Mon, Jun 02, 2014 at 05:51:25PM -0700, David Rientjes wrote: > From: Hugh Dickins <hu...@google.com> > > mem_cgroup_force_empty_list() can iterate a large number of pages on an lru > and > mem_cgroup_move_parent() doesn't return an errno unless certain criteria, > none > of which indicate that the iteration may be taking too long, is met. > > We have encountered the following stack trace many times indicating > "need_resched set for > 51000020 ns (51 ticks) without schedule", for example: > > scheduler_tick() > <timer irq> > mem_cgroup_move_account+0x4d/0x1d5 > mem_cgroup_move_parent+0x8d/0x109 > mem_cgroup_reparent_charges+0x149/0x2ba > mem_cgroup_css_offline+0xeb/0x11b > cgroup_offline_fn+0x68/0x16b > process_one_work+0x129/0x350 > > If this iteration is taking too long, we still need to do cond_resched() even > when an individual page is not busy. > > [rient...@google.com: changelog] > Signed-off-by: Hugh Dickins <hu...@google.com> > Signed-off-by: David Rientjes <rient...@google.com>
Acked-by: Johannes Weiner <han...@cmpxchg.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
