From e5e68930263377c6d4f6da0ff06f36b55d83a83f Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Wed, 6 Sep 2017 16:19:37 -0700 Subject: [PATCH] mm, memory_hotplug: display allowed zones in the preferred ordering Prior to commit f1dd2cd13c4b ("mm, memory_hotplug: do not associate hotadded memory to zones until online") we used to allow to change the valid zone types of a memory block if it is adjacent to a different zone type. This fact was reflected in memoryNN/valid_zones by the ordering of printed zones. The first one was default (echo online > memoryNN/state) and the other one could be onlined explicitly by online_{movable,kernel}. This behavior was removed by the said patch and as such the ordering was not all that important. In most cases a kernel zone would be default anyway. The only exception is movable_node handled by "mm, memory_hotplug: support movable_node for hotpluggable nodes". Let's reintroduce this behavior again because later patch will remove the zone overlap restriction and so user will be allowed to online kernel resp. movable block regardless of its placement. Original behavior will then become significant again because it would be non-trivial for users to see what is the default zone to online into. Implementation is really simple. Pull out zone selection out of move_pfn_range into zone_for_pfn_range helper and use it in show_valid_zones to display the zone for default onlining and then both kernel and movable if they are allowed. Default online zone is not duplicated. Link: http://lkml.kernel.org/r/20170714121233.16861-2-mhocko@kernel.org Signed-off-by: Michal Hocko Acked-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Mel Gorman Cc: Andrea Arcangeli Cc: Reza Arbab Cc: Yasuaki Ishimatsu Cc: Xishi Qiu Cc: Kani Toshimitsu Cc: Cc: Daniel Kiper Cc: Igor Mammedov Cc: Vitaly Kuznetsov Cc: Wei Yang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/base/memory.c | 33 +++++++++++++------ include/linux/memory_hotplug.h | 2 +- mm/memory_hotplug.c | 73 ++++++++++++++++++++++++------------------ 3 files changed, 65 insertions(+), 43 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index c7c4e03..26383af 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -388,6 +388,22 @@ static ssize_t show_phys_device(struct device *dev, } #ifdef CONFIG_MEMORY_HOTREMOVE +static void print_allowed_zone(char *buf, int nid, unsigned long start_pfn, + unsigned long nr_pages, int online_type, + struct zone *default_zone) +{ + 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, " "); + strcat(buf, zone->name); + } +} + static ssize_t show_valid_zones(struct device *dev, struct device_attribute *attr, char *buf) { @@ -395,7 +411,7 @@ static ssize_t show_valid_zones(struct device *dev, unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr); unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; unsigned long valid_start_pfn, valid_end_pfn; - bool append = false; + struct zone *default_zone; int nid; /* @@ -418,16 +434,13 @@ static ssize_t show_valid_zones(struct device *dev, } nid = pfn_to_nid(start_pfn); - if (allow_online_pfn_range(nid, start_pfn, nr_pages, MMOP_ONLINE_KERNEL)) { - strcat(buf, default_zone_for_pfn(nid, start_pfn, nr_pages)->name); - append = true; - } + default_zone = zone_for_pfn_range(MMOP_ONLINE_KEEP, nid, start_pfn, nr_pages); + strcat(buf, default_zone->name); - if (allow_online_pfn_range(nid, start_pfn, nr_pages, MMOP_ONLINE_MOVABLE)) { - if (append) - strcat(buf, " "); - strcat(buf, NODE_DATA(nid)->node_zones[ZONE_MOVABLE].name); - } + print_allowed_zone(buf, nid, start_pfn, nr_pages, MMOP_ONLINE_KERNEL, + default_zone); + print_allowed_zone(buf, nid, start_pfn, nr_pages, MMOP_ONLINE_MOVABLE, + default_zone); out: strcat(buf, "\n"); diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index c8a5056..5e6e4cc 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -319,6 +319,6 @@ extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum); extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, int online_type); -extern struct zone *default_zone_for_pfn(int nid, unsigned long pfn, +extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, unsigned long nr_pages); #endif /* __LINUX_MEMORY_HOTPLUG_H */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8dccc31..e342624 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -773,31 +773,6 @@ static void node_states_set_node(int node, struct memory_notify *arg) node_set_state(node, N_MEMORY); } -bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, int online_type) -{ - struct pglist_data *pgdat = NODE_DATA(nid); - struct zone *movable_zone = &pgdat->node_zones[ZONE_MOVABLE]; - struct zone *default_zone = default_zone_for_pfn(nid, pfn, nr_pages); - - /* - * TODO there shouldn't be any inherent reason to have ZONE_NORMAL - * physically before ZONE_MOVABLE. All we need is they do not - * overlap. Historically we didn't allow ZONE_NORMAL after ZONE_MOVABLE - * though so let's stick with it for simplicity for now. - * TODO make sure we do not overlap with ZONE_DEVICE - */ - if (online_type == MMOP_ONLINE_KERNEL) { - if (zone_is_empty(movable_zone)) - return true; - return movable_zone->zone_start_pfn >= pfn + nr_pages; - } else if (online_type == MMOP_ONLINE_MOVABLE) { - return zone_end_pfn(default_zone) <= pfn; - } - - /* MMOP_ONLINE_KEEP will always succeed and inherits the current zone */ - return online_type == MMOP_ONLINE_KEEP; -} - static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages) { @@ -856,7 +831,7 @@ void __ref move_pfn_range_to_zone(struct zone *zone, * If no kernel zone covers this pfn range it will automatically go * to the ZONE_NORMAL. */ -struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, +static struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, unsigned long nr_pages) { struct pglist_data *pgdat = NODE_DATA(nid); @@ -872,6 +847,31 @@ struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, return &pgdat->node_zones[ZONE_NORMAL]; } +bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, int online_type) +{ + struct pglist_data *pgdat = NODE_DATA(nid); + struct zone *movable_zone = &pgdat->node_zones[ZONE_MOVABLE]; + struct zone *default_zone = default_zone_for_pfn(nid, pfn, nr_pages); + + /* + * TODO there shouldn't be any inherent reason to have ZONE_NORMAL + * physically before ZONE_MOVABLE. All we need is they do not + * overlap. Historically we didn't allow ZONE_NORMAL after ZONE_MOVABLE + * though so let's stick with it for simplicity for now. + * TODO make sure we do not overlap with ZONE_DEVICE + */ + if (online_type == MMOP_ONLINE_KERNEL) { + if (zone_is_empty(movable_zone)) + return true; + return movable_zone->zone_start_pfn >= pfn + nr_pages; + } else if (online_type == MMOP_ONLINE_MOVABLE) { + return zone_end_pfn(default_zone) <= pfn; + } + + /* MMOP_ONLINE_KEEP will always succeed and inherits the current zone */ + return online_type == MMOP_ONLINE_KEEP; +} + static inline bool movable_pfn_range(int nid, struct zone *default_zone, unsigned long start_pfn, unsigned long nr_pages) { @@ -885,12 +885,8 @@ static inline bool movable_pfn_range(int nid, struct zone *default_zone, return !zone_intersects(default_zone, start_pfn, nr_pages); } -/* - * Associates the given pfn range with the given node and the zone appropriate - * for the given online type. - */ -static struct zone * __meminit move_pfn_range(int online_type, int nid, - unsigned long start_pfn, unsigned long nr_pages) +struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, + unsigned long nr_pages) { struct pglist_data *pgdat = NODE_DATA(nid); struct zone *zone = default_zone_for_pfn(nid, start_pfn, nr_pages); @@ -909,6 +905,19 @@ static struct zone * __meminit move_pfn_range(int online_type, int nid, zone = &pgdat->node_zones[ZONE_MOVABLE]; } + return zone; +} + +/* + * Associates the given pfn range with the given node and the zone appropriate + * for the given online type. + */ +static struct zone * __meminit move_pfn_range(int online_type, int nid, + unsigned long start_pfn, unsigned long nr_pages) +{ + struct zone *zone; + + zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); move_pfn_range_to_zone(zone, start_pfn, nr_pages); return zone; } -- 2.7.4