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mm/mmzone.c
2.36 KB
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/* * linux/mm/mmzone.c * |
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* management codes for pgdats, zones and page flags |
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*/ |
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#include <linux/stddef.h> |
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#include <linux/mm.h> |
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#include <linux/mmzone.h> |
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struct pglist_data *first_online_pgdat(void) { return NODE_DATA(first_online_node); } |
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struct pglist_data *next_online_pgdat(struct pglist_data *pgdat) { int nid = next_online_node(pgdat->node_id); if (nid == MAX_NUMNODES) return NULL; return NODE_DATA(nid); } |
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/* * next_zone - helper magic for for_each_zone() */ struct zone *next_zone(struct zone *zone) { pg_data_t *pgdat = zone->zone_pgdat; if (zone < pgdat->node_zones + MAX_NR_ZONES - 1) zone++; else { pgdat = next_online_pgdat(pgdat); if (pgdat) zone = pgdat->node_zones; else zone = NULL; } return zone; } |
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static inline int zref_in_nodemask(struct zoneref *zref, nodemask_t *nodes) { #ifdef CONFIG_NUMA return node_isset(zonelist_node_idx(zref), *nodes); #else return 1; #endif /* CONFIG_NUMA */ } /* Returns the next zone at or below highest_zoneidx in a zonelist */ |
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struct zoneref *__next_zones_zonelist(struct zoneref *z, |
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enum zone_type highest_zoneidx, |
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nodemask_t *nodes) |
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{ /* * Find the next suitable zone to use for the allocation. * Only filter based on nodemask if it's set */ if (likely(nodes == NULL)) while (zonelist_zone_idx(z) > highest_zoneidx) z++; else while (zonelist_zone_idx(z) > highest_zoneidx || (z->zone && !zref_in_nodemask(z, nodes))) z++; |
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return z; } |
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#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL |
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bool memmap_valid_within(unsigned long pfn, |
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struct page *page, struct zone *zone) { if (page_to_pfn(page) != pfn) |
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return false; |
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if (page_zone(page) != zone) |
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return false; |
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return true; |
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} #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */ |
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void lruvec_init(struct lruvec *lruvec) |
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{ enum lru_list lru; memset(lruvec, 0, sizeof(struct lruvec)); for_each_lru(lru) INIT_LIST_HEAD(&lruvec->lists[lru]); |
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} |
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#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) int page_cpupid_xchg_last(struct page *page, int cpupid) |
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{ unsigned long old_flags, flags; |
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int last_cpupid; |
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do { old_flags = flags = page->flags; |
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last_cpupid = page_cpupid_last(page); |
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flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; |
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} while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags)); |
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return last_cpupid; |
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} #endif |