From c6f03e2903c9ecd8fd709a5b3fa8cf0a8ae0b3da Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Wed, 6 Sep 2017 16:19:40 -0700 Subject: mm, memory_hotplug: remove zone restrictions Historically we have enforced that any kernel zone (e.g ZONE_NORMAL) has to precede the Movable zone in the physical memory range. The purpose of the movable zone is, however, not bound to any physical memory restriction. It merely defines a class of migrateable and reclaimable memory. There are users (e.g. CMA) who might want to reserve specific physical memory ranges for their own purpose. Moreover our pfn walkers have to be prepared for zones overlapping in the physical range already because we do support interleaving NUMA nodes and therefore zones can interleave as well. This means we can allow each memory block to be associated with a different zone. Loosen the current onlining semantic and allow explicit onlining type on any memblock. That means that online_{kernel,movable} will be allowed regardless of the physical address of the memblock as long as it is offline of course. This might result in moveble zone overlapping with other kernel zones. Default onlining then becomes a bit tricky but still sensible. echo online > memoryXY/state will online the given block to 1) the default zone if the given range is outside of any zone 2) the enclosing zone if such a zone doesn't interleave with any other zone 3) the default zone if more zones interleave for this range where default zone is movable zone only if movable_node is enabled otherwise it is a kernel zone. Here is an example of the semantic with (movable_node is not present but it work in an analogous way). We start with following memblocks, all of them offline: memory34/valid_zones:Normal Movable memory35/valid_zones:Normal Movable memory36/valid_zones:Normal Movable memory37/valid_zones:Normal Movable memory38/valid_zones:Normal Movable memory39/valid_zones:Normal Movable memory40/valid_zones:Normal Movable memory41/valid_zones:Normal Movable Now, we online block 34 in default mode and block 37 as movable root@test1:/sys/devices/system/node/node1# echo online > memory34/state root@test1:/sys/devices/system/node/node1# echo online_movable > memory37/state memory34/valid_zones:Normal memory35/valid_zones:Normal Movable memory36/valid_zones:Normal Movable memory37/valid_zones:Movable memory38/valid_zones:Normal Movable memory39/valid_zones:Normal Movable memory40/valid_zones:Normal Movable memory41/valid_zones:Normal Movable As we can see all other blocks can still be onlined both into Normal and Movable zones and the Normal is default because the Movable zone spans only block37 now. root@test1:/sys/devices/system/node/node1# echo online_movable > memory41/state memory34/valid_zones:Normal memory35/valid_zones:Normal Movable memory36/valid_zones:Normal Movable memory37/valid_zones:Movable memory38/valid_zones:Movable Normal memory39/valid_zones:Movable Normal memory40/valid_zones:Movable Normal memory41/valid_zones:Movable Now the default zone for blocks 37-41 has changed because movable zone spans that range. root@test1:/sys/devices/system/node/node1# echo online_kernel > memory39/state memory34/valid_zones:Normal memory35/valid_zones:Normal Movable memory36/valid_zones:Normal Movable memory37/valid_zones:Movable memory38/valid_zones:Normal Movable memory39/valid_zones:Normal memory40/valid_zones:Movable Normal memory41/valid_zones:Movable Note that the block 39 now belongs to the zone Normal and so block38 falls into Normal by default as well. For completness root@test1:/sys/devices/system/node/node1# for i in memory[34]? do echo online > $i/state 2>/dev/null done memory34/valid_zones:Normal memory35/valid_zones:Normal memory36/valid_zones:Normal memory37/valid_zones:Movable memory38/valid_zones:Normal memory39/valid_zones:Normal memory40/valid_zones:Movable memory41/valid_zones:Movable Implementation wise the change is quite straightforward. We can get rid of allow_online_pfn_range altogether. online_pages allows only offline nodes already. The original default_zone_for_pfn will become default_kernel_zone_for_pfn. New default_zone_for_pfn implements the above semantic. zone_for_pfn_range is slightly reorganized to implement kernel and movable online type explicitly and MMOP_ONLINE_KEEP becomes a catch all default behavior. Link: http://lkml.kernel.org/r/20170714121233.16861-3-mhocko@kernel.org Signed-off-by: Michal Hocko Acked-by: Joonsoo Kim Acked-by: Vlastimil Babka Acked-by: Reza Arbab Cc: Mel Gorman Cc: Andrea Arcangeli Cc: Yasuaki Ishimatsu Cc: Xishi Qiu Cc: Kani Toshimitsu Cc: Cc: Daniel Kiper Cc: Igor Mammedov Cc: Vitaly Kuznetsov Cc: Wei Yang Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/base/memory.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers/base/memory.c') diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 26383af9900c..4e3b61cda520 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -394,9 +394,6 @@ static void print_allowed_zone(char *buf, int nid, unsigned long start_pfn, { struct zone *zone; - if (!allow_online_pfn_range(nid, start_pfn, nr_pages, online_type)) - return; - zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); if (zone != default_zone) { strcat(buf, " "); -- cgit v1.2.3