#include <linux/fs.h>

  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>

  #include <linux/hugetlb.h>

  #include <linux/mman.h>
  #include <linux/mmzone.h>
  #include <linux/proc_fs.h>
  #include <linux/quicklist.h>
  #include <linux/seq_file.h>
  #include <linux/swap.h>
  #include <linux/vmstat.h>

  #include <linux/atomic.h>

  #include <linux/vmalloc.h>

  #ifdef CONFIG_CMA
  #include <linux/cma.h>
  #endif

  #include <asm/page.h>
  #include <asm/pgtable.h>
  #include "internal.h"
  
  void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
  {
  }
  
  static int meminfo_proc_show(struct seq_file *m, void *v)
  {
  	struct sysinfo i;
  	unsigned long committed;

  	long cached;

  	long available;

  	unsigned long pages[NR_LRU_LISTS];
  	int lru;
  
  /*
   * display in kilobytes.
   */
  #define K(x) ((x) << (PAGE_SHIFT - 10))
  	si_meminfo(&i);
  	si_swapinfo(&i);

  	committed = percpu_counter_read_positive(&vm_committed_as);

  
  	cached = global_page_state(NR_FILE_PAGES) -

  			total_swapcache_pages() - i.bufferram;

  	if (cached < 0)
  		cached = 0;

  	for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  		pages[lru] = global_page_state(NR_LRU_BASE + lru);

  	available = si_mem_available();

  	/*
  	 * Tagged format, for easy grepping and expansion.
  	 */
  	seq_printf(m,
  		"MemTotal:       %8lu kB
  "
  		"MemFree:        %8lu kB
  "

  		"MemAvailable:   %8lu kB
  "

  		"Buffers:        %8lu kB
  "
  		"Cached:         %8lu kB
  "
  		"SwapCached:     %8lu kB
  "
  		"Active:         %8lu kB
  "
  		"Inactive:       %8lu kB
  "
  		"Active(anon):   %8lu kB
  "
  		"Inactive(anon): %8lu kB
  "
  		"Active(file):   %8lu kB
  "
  		"Inactive(file): %8lu kB
  "

  		"Unevictable:    %8lu kB
  "
  		"Mlocked:        %8lu kB
  "

  #ifdef CONFIG_HIGHMEM
  		"HighTotal:      %8lu kB
  "
  		"HighFree:       %8lu kB
  "
  		"LowTotal:       %8lu kB
  "
  		"LowFree:        %8lu kB
  "
  #endif

  #ifndef CONFIG_MMU
  		"MmapCopy:       %8lu kB
  "
  #endif

  		"SwapTotal:      %8lu kB
  "
  		"SwapFree:       %8lu kB
  "
  		"Dirty:          %8lu kB
  "
  		"Writeback:      %8lu kB
  "
  		"AnonPages:      %8lu kB
  "
  		"Mapped:         %8lu kB
  "

  		"Shmem:          %8lu kB
  "

  		"Slab:           %8lu kB
  "
  		"SReclaimable:   %8lu kB
  "
  		"SUnreclaim:     %8lu kB
  "

  		"KernelStack:    %8lu kB
  "

  		"PageTables:     %8lu kB
  "
  #ifdef CONFIG_QUICKLIST
  		"Quicklists:     %8lu kB
  "
  #endif
  		"NFS_Unstable:   %8lu kB
  "
  		"Bounce:         %8lu kB
  "
  		"WritebackTmp:   %8lu kB
  "
  		"CommitLimit:    %8lu kB
  "
  		"Committed_AS:   %8lu kB
  "
  		"VmallocTotal:   %8lu kB
  "
  		"VmallocUsed:    %8lu kB
  "

  		"VmallocChunk:   %8lu kB
  "
  #ifdef CONFIG_MEMORY_FAILURE

  		"HardwareCorrupted: %5lu kB
  "

  #endif

  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  		"AnonHugePages:  %8lu kB
  "
  #endif

  #ifdef CONFIG_CMA
  		"CmaTotal:       %8lu kB
  "
  		"CmaFree:        %8lu kB
  "
  #endif

  		,

  		K(i.totalram),
  		K(i.freeram),

  		K(available),

  		K(i.bufferram),
  		K(cached),

  		K(total_swapcache_pages()),

  		K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
  		K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
  		K(pages[LRU_ACTIVE_ANON]),
  		K(pages[LRU_INACTIVE_ANON]),
  		K(pages[LRU_ACTIVE_FILE]),
  		K(pages[LRU_INACTIVE_FILE]),

  		K(pages[LRU_UNEVICTABLE]),
  		K(global_page_state(NR_MLOCK)),

  #ifdef CONFIG_HIGHMEM
  		K(i.totalhigh),
  		K(i.freehigh),
  		K(i.totalram-i.totalhigh),
  		K(i.freeram-i.freehigh),
  #endif

  #ifndef CONFIG_MMU

  		K((unsigned long) atomic_long_read(&mmap_pages_allocated)),

  #endif

  		K(i.totalswap),
  		K(i.freeswap),
  		K(global_page_state(NR_FILE_DIRTY)),
  		K(global_page_state(NR_WRITEBACK)),

  		K(global_page_state(NR_ANON_PAGES)),

  		K(global_page_state(NR_FILE_MAPPED)),

  		K(i.sharedram),

  		K(global_page_state(NR_SLAB_RECLAIMABLE) +
  				global_page_state(NR_SLAB_UNRECLAIMABLE)),
  		K(global_page_state(NR_SLAB_RECLAIMABLE)),
  		K(global_page_state(NR_SLAB_UNRECLAIMABLE)),

  		global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,

  		K(global_page_state(NR_PAGETABLE)),
  #ifdef CONFIG_QUICKLIST
  		K(quicklist_total_size()),
  #endif
  		K(global_page_state(NR_UNSTABLE_NFS)),
  		K(global_page_state(NR_BOUNCE)),
  		K(global_page_state(NR_WRITEBACK_TEMP)),

  		K(vm_commit_limit()),

  		K(committed),
  		(unsigned long)VMALLOC_TOTAL >> 10,

  		0ul, // used to be vmalloc 'used'
  		0ul  // used to be vmalloc 'largest_chunk'

  #ifdef CONFIG_MEMORY_FAILURE

  		, atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)

  #endif

  #ifdef CONFIG_TRANSPARENT_HUGEPAGE

  		, K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *

  		   HPAGE_PMD_NR)
  #endif

  #ifdef CONFIG_CMA
  		, K(totalcma_pages)
  		, K(global_page_state(NR_FREE_CMA_PAGES))
  #endif

  		);
  
  	hugetlb_report_meminfo(m);
  
  	arch_report_meminfo(m);
  
  	return 0;
  #undef K
  }
  
  static int meminfo_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, meminfo_proc_show, NULL);
  }
  
  static const struct file_operations meminfo_proc_fops = {
  	.open		= meminfo_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  static int __init proc_meminfo_init(void)
  {
  	proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
  	return 0;
  }

  fs_initcall(proc_meminfo_init);