On Thu, 24 Nov 2011 14:11:55 +0100 Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > On Thu, Nov 24, 2011 at 10:07:55AM +0900, KAMEZAWA Hiroyuki wrote: goto this_zone_full; > > > > > > BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); > > > if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { > > > > This wil call > > > > if (NUMA_BUILD) > > zlc_mark_zone_full(zonelist, z); > > > > And this zone will be marked as full. > > > > IIUC, zlc_clear_zones_full() is called only when direct reclaim ends. > > So, if no one calls direct-reclaim, 'full' mark may never be cleared > > even when number of dirty pages goes down to safe level ? > > I'm sorry if this is alread discussed. > > It does not remember which zones are marked full for longer than a > second - see zlc_setup() - and also ignores this information when an > iteration over the zonelist with the cache enabled came up > empty-handed. > Ah, thank you for clarification. I understand how zlc_active/did_zlc_setup/zlc_setup()...complicated ;) Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html