1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fs.h>
3 #include <linux/init.h>
4 #include <linux/kernel.h>
5 #include <linux/mm.h>
6 #include <linux/hugetlb.h>
7 #include <linux/mman.h>
8 #include <linux/mmzone.h>
9 #include <linux/proc_fs.h>
10 #include <linux/percpu.h>
11 #include <linux/seq_file.h>
12 #include <linux/swap.h>
13 #include <linux/vmstat.h>
14 #include <linux/atomic.h>
15 #include <linux/vmalloc.h>
16 #ifdef CONFIG_CMA
17 #include <linux/cma.h>
18 #endif
19 #include <asm/page.h>
20 #include "internal.h"
21 
arch_report_meminfo(struct seq_file * m)22 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
23 {
24 }
25 
show_val_kb(struct seq_file * m,const char * s,unsigned long num)26 static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
27 {
28 	seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
29 	seq_write(m, " kB\n", 4);
30 }
31 
meminfo_proc_show(struct seq_file * m,void * v)32 static int meminfo_proc_show(struct seq_file *m, void *v)
33 {
34 	struct sysinfo i;
35 	unsigned long committed;
36 	long cached;
37 	long available;
38 	unsigned long pages[NR_LRU_LISTS];
39 	unsigned long sreclaimable, sunreclaim;
40 	int lru;
41 
42 	si_meminfo(&i);
43 	si_swapinfo(&i);
44 	committed = vm_memory_committed();
45 
46 	cached = global_node_page_state(NR_FILE_PAGES) -
47 			total_swapcache_pages() - i.bufferram;
48 	if (cached < 0)
49 		cached = 0;
50 
51 	for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
52 		pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
53 
54 	available = si_mem_available();
55 	sreclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B);
56 	sunreclaim = global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B);
57 
58 	show_val_kb(m, "MemTotal:       ", i.totalram);
59 	show_val_kb(m, "MemFree:        ", i.freeram);
60 	show_val_kb(m, "MemAvailable:   ", available);
61 	show_val_kb(m, "Buffers:        ", i.bufferram);
62 	show_val_kb(m, "Cached:         ", cached);
63 	show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
64 	show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
65 					   pages[LRU_ACTIVE_FILE]);
66 	show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
67 					   pages[LRU_INACTIVE_FILE]);
68 	show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
69 	show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
70 	show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
71 	show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
72 	show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
73 	show_val_kb(m, "Mlocked:        ", global_zone_page_state(NR_MLOCK));
74 
75 #ifdef CONFIG_HIGHMEM
76 	show_val_kb(m, "HighTotal:      ", i.totalhigh);
77 	show_val_kb(m, "HighFree:       ", i.freehigh);
78 	show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
79 	show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
80 #endif
81 
82 #ifndef CONFIG_MMU
83 	show_val_kb(m, "MmapCopy:       ",
84 		    (unsigned long)atomic_long_read(&mmap_pages_allocated));
85 #endif
86 
87 	show_val_kb(m, "SwapTotal:      ", i.totalswap);
88 	show_val_kb(m, "SwapFree:       ", i.freeswap);
89 #ifdef CONFIG_ZSWAP
90 	seq_printf(m,  "Zswap:          %8lu kB\n",
91 		   (unsigned long)(zswap_pool_total_size >> 10));
92 	seq_printf(m,  "Zswapped:       %8lu kB\n",
93 		   (unsigned long)atomic_read(&zswap_stored_pages) <<
94 		   (PAGE_SHIFT - 10));
95 #endif
96 	show_val_kb(m, "Dirty:          ",
97 		    global_node_page_state(NR_FILE_DIRTY));
98 	show_val_kb(m, "Writeback:      ",
99 		    global_node_page_state(NR_WRITEBACK));
100 	show_val_kb(m, "AnonPages:      ",
101 		    global_node_page_state(NR_ANON_MAPPED));
102 	show_val_kb(m, "Mapped:         ",
103 		    global_node_page_state(NR_FILE_MAPPED));
104 	show_val_kb(m, "Shmem:          ", i.sharedram);
105 	show_val_kb(m, "KReclaimable:   ", sreclaimable +
106 		    global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
107 	show_val_kb(m, "Slab:           ", sreclaimable + sunreclaim);
108 	show_val_kb(m, "SReclaimable:   ", sreclaimable);
109 	show_val_kb(m, "SUnreclaim:     ", sunreclaim);
110 	seq_printf(m, "KernelStack:    %8lu kB\n",
111 		   global_node_page_state(NR_KERNEL_STACK_KB));
112 #ifdef CONFIG_SHADOW_CALL_STACK
113 	seq_printf(m, "ShadowCallStack:%8lu kB\n",
114 		   global_node_page_state(NR_KERNEL_SCS_KB));
115 #endif
116 	show_val_kb(m, "PageTables:     ",
117 		    global_node_page_state(NR_PAGETABLE));
118 	show_val_kb(m, "SecPageTables:  ",
119 		    global_node_page_state(NR_SECONDARY_PAGETABLE));
120 
121 	show_val_kb(m, "NFS_Unstable:   ", 0);
122 	show_val_kb(m, "Bounce:         ",
123 		    global_zone_page_state(NR_BOUNCE));
124 	show_val_kb(m, "WritebackTmp:   ",
125 		    global_node_page_state(NR_WRITEBACK_TEMP));
126 	show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
127 	show_val_kb(m, "Committed_AS:   ", committed);
128 	seq_printf(m, "VmallocTotal:   %8lu kB\n",
129 		   (unsigned long)VMALLOC_TOTAL >> 10);
130 	show_val_kb(m, "VmallocUsed:    ", vmalloc_nr_pages());
131 	show_val_kb(m, "VmallocChunk:   ", 0ul);
132 	show_val_kb(m, "Percpu:         ", pcpu_nr_pages());
133 
134 #ifdef CONFIG_MEMORY_FAILURE
135 	seq_printf(m, "HardwareCorrupted: %5lu kB\n",
136 		   atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
137 #endif
138 
139 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
140 	show_val_kb(m, "AnonHugePages:  ",
141 		    global_node_page_state(NR_ANON_THPS));
142 	show_val_kb(m, "ShmemHugePages: ",
143 		    global_node_page_state(NR_SHMEM_THPS));
144 	show_val_kb(m, "ShmemPmdMapped: ",
145 		    global_node_page_state(NR_SHMEM_PMDMAPPED));
146 	show_val_kb(m, "FileHugePages:  ",
147 		    global_node_page_state(NR_FILE_THPS));
148 	show_val_kb(m, "FilePmdMapped:  ",
149 		    global_node_page_state(NR_FILE_PMDMAPPED));
150 #endif
151 
152 #ifdef CONFIG_CMA
153 	show_val_kb(m, "CmaTotal:       ", totalcma_pages);
154 	show_val_kb(m, "CmaFree:        ",
155 		    global_zone_page_state(NR_FREE_CMA_PAGES));
156 #endif
157 
158 	hugetlb_report_meminfo(m);
159 
160 	arch_report_meminfo(m);
161 
162 	return 0;
163 }
164 
proc_meminfo_init(void)165 static int __init proc_meminfo_init(void)
166 {
167 	struct proc_dir_entry *pde;
168 
169 	pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
170 	pde_make_permanent(pde);
171 	return 0;
172 }
173 fs_initcall(proc_meminfo_init);
174