1#include <linux/fs.h>
2#include <linux/init.h>
3#include <linux/kernel.h>
4#include <linux/mm.h>
5#include <linux/hugetlb.h>
6#include <linux/mman.h>
7#include <linux/mmzone.h>
8#include <linux/proc_fs.h>
9#include <linux/quicklist.h>
10#include <linux/seq_file.h>
11#include <linux/swap.h>
12#include <linux/vmstat.h>
13#include <linux/atomic.h>
14#include <linux/vmalloc.h>
15#ifdef CONFIG_CMA
16#include <linux/cma.h>
17#endif
18#include <asm/page.h>
19#include <asm/pgtable.h>
20#include "internal.h"
21
22void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
23{
24}
25
26static int meminfo_proc_show(struct seq_file *m, void *v)
27{
28	struct sysinfo i;
29	unsigned long committed;
30	struct vmalloc_info vmi;
31	long cached;
32	long available;
33	unsigned long pagecache;
34	unsigned long wmark_low = 0;
35	unsigned long pages[NR_LRU_LISTS];
36	struct zone *zone;
37	int lru;
38
39/*
40 * display in kilobytes.
41 */
42#define K(x) ((x) << (PAGE_SHIFT - 10))
43	si_meminfo(&i);
44	si_swapinfo(&i);
45	committed = percpu_counter_read_positive(&vm_committed_as);
46
47	cached = global_page_state(NR_FILE_PAGES) -
48			total_swapcache_pages() - i.bufferram;
49	if (cached < 0)
50		cached = 0;
51
52	get_vmalloc_info(&vmi);
53
54	for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
55		pages[lru] = global_page_state(NR_LRU_BASE + lru);
56
57	for_each_zone(zone)
58		wmark_low += zone->watermark[WMARK_LOW];
59
60	/*
61	 * Estimate the amount of memory available for userspace allocations,
62	 * without causing swapping.
63	 *
64	 * Free memory cannot be taken below the low watermark, before the
65	 * system starts swapping.
66	 */
67	available = i.freeram - wmark_low;
68
69	/*
70	 * Not all the page cache can be freed, otherwise the system will
71	 * start swapping. Assume at least half of the page cache, or the
72	 * low watermark worth of cache, needs to stay.
73	 */
74	pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
75	pagecache -= min(pagecache / 2, wmark_low);
76	available += pagecache;
77
78	/*
79	 * Part of the reclaimable slab consists of items that are in use,
80	 * and cannot be freed. Cap this estimate at the low watermark.
81	 */
82	available += global_page_state(NR_SLAB_RECLAIMABLE) -
83		     min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
84
85	if (available < 0)
86		available = 0;
87
88	/*
89	 * Tagged format, for easy grepping and expansion.
90	 */
91	seq_printf(m,
92		"MemTotal:       %8lu kB\n"
93		"MemFree:        %8lu kB\n"
94		"MemAvailable:   %8lu kB\n"
95		"Buffers:        %8lu kB\n"
96		"Cached:         %8lu kB\n"
97		"SwapCached:     %8lu kB\n"
98		"Active:         %8lu kB\n"
99		"Inactive:       %8lu kB\n"
100		"Active(anon):   %8lu kB\n"
101		"Inactive(anon): %8lu kB\n"
102		"Active(file):   %8lu kB\n"
103		"Inactive(file): %8lu kB\n"
104		"Unevictable:    %8lu kB\n"
105		"Mlocked:        %8lu kB\n"
106#ifdef CONFIG_HIGHMEM
107		"HighTotal:      %8lu kB\n"
108		"HighFree:       %8lu kB\n"
109		"LowTotal:       %8lu kB\n"
110		"LowFree:        %8lu kB\n"
111#endif
112#ifndef CONFIG_MMU
113		"MmapCopy:       %8lu kB\n"
114#endif
115		"SwapTotal:      %8lu kB\n"
116		"SwapFree:       %8lu kB\n"
117		"Dirty:          %8lu kB\n"
118		"Writeback:      %8lu kB\n"
119		"AnonPages:      %8lu kB\n"
120		"Mapped:         %8lu kB\n"
121		"Shmem:          %8lu kB\n"
122		"Slab:           %8lu kB\n"
123		"SReclaimable:   %8lu kB\n"
124		"SUnreclaim:     %8lu kB\n"
125		"KernelStack:    %8lu kB\n"
126		"PageTables:     %8lu kB\n"
127#ifdef CONFIG_QUICKLIST
128		"Quicklists:     %8lu kB\n"
129#endif
130		"NFS_Unstable:   %8lu kB\n"
131		"Bounce:         %8lu kB\n"
132		"WritebackTmp:   %8lu kB\n"
133		"CommitLimit:    %8lu kB\n"
134		"Committed_AS:   %8lu kB\n"
135		"VmallocTotal:   %8lu kB\n"
136		"VmallocUsed:    %8lu kB\n"
137		"VmallocChunk:   %8lu kB\n"
138#ifdef CONFIG_MEMORY_FAILURE
139		"HardwareCorrupted: %5lu kB\n"
140#endif
141#ifdef CONFIG_TRANSPARENT_HUGEPAGE
142		"AnonHugePages:  %8lu kB\n"
143#endif
144#ifdef CONFIG_CMA
145		"CmaTotal:       %8lu kB\n"
146		"CmaFree:        %8lu kB\n"
147#endif
148		,
149		K(i.totalram),
150		K(i.freeram),
151		K(available),
152		K(i.bufferram),
153		K(cached),
154		K(total_swapcache_pages()),
155		K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
156		K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
157		K(pages[LRU_ACTIVE_ANON]),
158		K(pages[LRU_INACTIVE_ANON]),
159		K(pages[LRU_ACTIVE_FILE]),
160		K(pages[LRU_INACTIVE_FILE]),
161		K(pages[LRU_UNEVICTABLE]),
162		K(global_page_state(NR_MLOCK)),
163#ifdef CONFIG_HIGHMEM
164		K(i.totalhigh),
165		K(i.freehigh),
166		K(i.totalram-i.totalhigh),
167		K(i.freeram-i.freehigh),
168#endif
169#ifndef CONFIG_MMU
170		K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
171#endif
172		K(i.totalswap),
173		K(i.freeswap),
174		K(global_page_state(NR_FILE_DIRTY)),
175		K(global_page_state(NR_WRITEBACK)),
176		K(global_page_state(NR_ANON_PAGES)),
177		K(global_page_state(NR_FILE_MAPPED)),
178		K(i.sharedram),
179		K(global_page_state(NR_SLAB_RECLAIMABLE) +
180				global_page_state(NR_SLAB_UNRECLAIMABLE)),
181		K(global_page_state(NR_SLAB_RECLAIMABLE)),
182		K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
183		global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
184		K(global_page_state(NR_PAGETABLE)),
185#ifdef CONFIG_QUICKLIST
186		K(quicklist_total_size()),
187#endif
188		K(global_page_state(NR_UNSTABLE_NFS)),
189		K(global_page_state(NR_BOUNCE)),
190		K(global_page_state(NR_WRITEBACK_TEMP)),
191		K(vm_commit_limit()),
192		K(committed),
193		(unsigned long)VMALLOC_TOTAL >> 10,
194		vmi.used >> 10,
195		vmi.largest_chunk >> 10
196#ifdef CONFIG_MEMORY_FAILURE
197		, atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
198#endif
199#ifdef CONFIG_TRANSPARENT_HUGEPAGE
200		, K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
201		   HPAGE_PMD_NR)
202#endif
203#ifdef CONFIG_CMA
204		, K(totalcma_pages)
205		, K(global_page_state(NR_FREE_CMA_PAGES))
206#endif
207		);
208
209	hugetlb_report_meminfo(m);
210
211	arch_report_meminfo(m);
212
213	return 0;
214#undef K
215}
216
217static int meminfo_proc_open(struct inode *inode, struct file *file)
218{
219	return single_open(file, meminfo_proc_show, NULL);
220}
221
222static const struct file_operations meminfo_proc_fops = {
223	.open		= meminfo_proc_open,
224	.read		= seq_read,
225	.llseek		= seq_lseek,
226	.release	= single_release,
227};
228
229static int __init proc_meminfo_init(void)
230{
231	proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
232	return 0;
233}
234fs_initcall(proc_meminfo_init);
235