October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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Node descriptor structure
Node descriptor structure pg_data_t is declared in kernel header mmzone.h:
/* include/linux/mmzone.h */typedef struct pglist_data { struct zone node_zones[MAX_NR_ZONES]; struct zonelist node_zonelists[MAX_ZONELISTS]; int nr_zones;#ifdef CONFIG_FLAT_NODE_MEM_MAP /* means !SPARSEMEM */ struct page *node_mem_map;#ifdef CONFIG_PAGE_EXTENSION struct page_ext *node_page_ext;#endif#endif#ifndef CONFIG_NO_BOOTMEM struct bootmem_data *bdata;#endif#ifdef CONFIG_MEMORY_HOTPLUG spinlock_t node_size_lock;#endif unsigned long node_start_pfn; unsigned long node_present_pages; /* total number of physical pages */ unsigned long node_spanned_pages; int node_id; wait_queue_head_t kswapd_wait; wait_queue_head_t pfmemalloc_wait; struct ...