From 72675e131eb418c78980c1e683c0c25a25b61221 Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Wed, 6 Sep 2017 16:20:24 -0700 Subject: [PATCH] mm, memory_hotplug: drop zone from build_all_zonelists build_all_zonelists gets a zone parameter to initialize zone's pagesets. There is only a single user which gives a non-NULL zone parameter and that one doesn't really need the rest of the build_all_zonelists (see commit 6dcd73d7011b ("memory-hotplug: allocate zone's pcp before onlining pages")). Therefore remove setup_zone_pageset from build_all_zonelists and call it from its only user directly. This will also remove a pointless zonlists rebuilding which is always good. Link: http://lkml.kernel.org/r/20170721143915.14161-5-mhocko@kernel.org Signed-off-by: Michal Hocko Acked-by: Vlastimil Babka Cc: Johannes Weiner Cc: Joonsoo Kim Cc: Mel Gorman Cc: Shaohua Li Cc: Toshi Kani Cc: Wen Congyang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmzone.h | 2 +- init/main.c | 2 +- mm/internal.h | 1 + mm/memory_hotplug.c | 10 +++++----- mm/page_alloc.c | 13 +++---------- 5 files changed, 11 insertions(+), 17 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index bfdc37b77d88..551f68bec2fa 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -771,7 +771,7 @@ static inline bool is_dev_zone(const struct zone *zone) #include extern struct mutex zonelists_mutex; -void build_all_zonelists(pg_data_t *pgdat, struct zone *zone); +void build_all_zonelists(pg_data_t *pgdat); void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx); bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, int classzone_idx, unsigned int alloc_flags, diff --git a/init/main.c b/init/main.c index 8828fc148670..a21a1a8708a8 100644 --- a/init/main.c +++ b/init/main.c @@ -542,7 +542,7 @@ asmlinkage __visible void __init start_kernel(void) boot_cpu_state_init(); smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ - build_all_zonelists(NULL, NULL); + build_all_zonelists(NULL); page_alloc_init(); pr_notice("Kernel command line: %s\n", boot_command_line); diff --git a/mm/internal.h b/mm/internal.h index 4ef49fc55e58..781c0d54d75a 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -525,4 +525,5 @@ static inline bool is_migrate_highatomic_page(struct page *page) return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC; } +void setup_zone_pageset(struct zone *zone); #endif /* __MM_INTERNAL_H */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 3e69984346da..c4df7d3c64d1 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -929,7 +929,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ mutex_lock(&zonelists_mutex); if (!populated_zone(zone)) { need_zonelists_rebuild = 1; - build_all_zonelists(NULL, zone); + setup_zone_pageset(zone); } ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, @@ -950,7 +950,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ if (onlined_pages) { node_states_set_node(nid, &arg); if (need_zonelists_rebuild) - build_all_zonelists(NULL, NULL); + build_all_zonelists(NULL); else zone_pcp_update(zone); } @@ -1028,7 +1028,7 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) * to access not-initialized zonelist, build here. */ mutex_lock(&zonelists_mutex); - build_all_zonelists(pgdat, NULL); + build_all_zonelists(pgdat); mutex_unlock(&zonelists_mutex); /* @@ -1084,7 +1084,7 @@ int try_online_node(int nid) if (pgdat->node_zonelists->_zonerefs->zone == NULL) { mutex_lock(&zonelists_mutex); - build_all_zonelists(NULL, NULL); + build_all_zonelists(NULL); mutex_unlock(&zonelists_mutex); } @@ -1704,7 +1704,7 @@ repeat: if (!populated_zone(zone)) { zone_pcp_reset(zone); mutex_lock(&zonelists_mutex); - build_all_zonelists(NULL, NULL); + build_all_zonelists(NULL); mutex_unlock(&zonelists_mutex); } else zone_pcp_update(zone); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 94fb4370e000..2523d5b3b22f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5129,7 +5129,6 @@ static void build_zonelists(pg_data_t *pgdat) static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); -static void setup_zone_pageset(struct zone *zone); /* * Global mutex to protect against size modification of zonelists @@ -5209,20 +5208,14 @@ build_all_zonelists_init(void) * Called with zonelists_mutex held always * unless system_state == SYSTEM_BOOTING. * - * __ref due to (1) call of __meminit annotated setup_zone_pageset - * [we're only called with non-NULL zone through __meminit paths] and - * (2) call of __init annotated helper build_all_zonelists_init + * __ref due to call of __init annotated helper build_all_zonelists_init * [protected by SYSTEM_BOOTING]. */ -void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) +void __ref build_all_zonelists(pg_data_t *pgdat) { if (system_state == SYSTEM_BOOTING) { build_all_zonelists_init(); } else { -#ifdef CONFIG_MEMORY_HOTPLUG - if (zone) - setup_zone_pageset(zone); -#endif /* we have to stop all cpus to guarantee there is no user of zonelist */ stop_machine_cpuslocked(__build_all_zonelists, pgdat, NULL); @@ -5496,7 +5489,7 @@ static void __meminit zone_pageset_init(struct zone *zone, int cpu) pageset_set_high_and_batch(zone, pcp); } -static void __meminit setup_zone_pageset(struct zone *zone) +void __meminit setup_zone_pageset(struct zone *zone) { int cpu; zone->pageset = alloc_percpu(struct per_cpu_pageset); -- 2.30.2