2 * linux/fs/proc/proc_misc.c
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
8 * This used to be the part of array.c. See the rest of history and credits
9 * there. I took this into a separate file and switched the thing to generic
10 * proc_file_inode_operations, leaving in array.c only per-process stuff.
11 * Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/kernel_stat.h>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/quicklist.h>
28 #include <linux/proc_fs.h>
29 #include <linux/ioport.h>
31 #include <linux/mmzone.h>
32 #include <linux/pagemap.h>
33 #include <linux/irq.h>
34 #include <linux/interrupt.h>
35 #include <linux/swap.h>
36 #include <linux/slab.h>
37 #include <linux/genhd.h>
38 #include <linux/smp.h>
39 #include <linux/signal.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/seq_file.h>
43 #include <linux/times.h>
44 #include <linux/profile.h>
45 #include <linux/utsname.h>
46 #include <linux/blkdev.h>
47 #include <linux/hugetlb.h>
48 #include <linux/jiffies.h>
49 #include <linux/vmalloc.h>
50 #include <linux/crash_dump.h>
51 #include <linux/pid_namespace.h>
52 #include <linux/bootmem.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
57 #include <asm/div64.h>
61 extern const struct seq_operations modules_op;
62 static int modules_open(struct inode *inode, struct file *file)
64 return seq_open(file, &modules_op);
66 static const struct file_operations proc_modules_operations = {
70 .release = seq_release,
74 #ifdef CONFIG_PROC_PAGE_MONITOR
75 #define KPMSIZE sizeof(u64)
76 #define KPMMASK (KPMSIZE - 1)
77 /* /proc/kpagecount - an array exposing page counts
79 * Each entry is a u64 representing the corresponding
80 * physical page count.
82 static ssize_t kpagecount_read(struct file *file, char __user *buf,
83 size_t count, loff_t *ppos)
85 u64 __user *out = (u64 __user *)buf;
87 unsigned long src = *ppos;
93 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
94 if (src & KPMMASK || count & KPMMASK)
100 ppage = pfn_to_page(pfn);
105 pcount = page_mapcount(ppage);
107 if (put_user(pcount, out++)) {
115 *ppos += (char __user *)out - buf;
117 ret = (char __user *)out - buf;
121 static struct file_operations proc_kpagecount_operations = {
123 .read = kpagecount_read,
126 /* /proc/kpageflags - an array exposing page flags
128 * Each entry is a u64 representing the corresponding
129 * physical page flags.
132 /* These macros are used to decouple internal flags from exported ones */
136 #define KPF_REFERENCED 2
137 #define KPF_UPTODATE 3
142 #define KPF_WRITEBACK 8
143 #define KPF_RECLAIM 9
146 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
148 static ssize_t kpageflags_read(struct file *file, char __user *buf,
149 size_t count, loff_t *ppos)
151 u64 __user *out = (u64 __user *)buf;
153 unsigned long src = *ppos;
159 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
160 if (src & KPMMASK || count & KPMMASK)
166 ppage = pfn_to_page(pfn);
171 kflags = ppage->flags;
173 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
174 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
175 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
176 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
177 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
178 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
179 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
180 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
181 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
182 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
183 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
185 if (put_user(uflags, out++)) {
193 *ppos += (char __user *)out - buf;
195 ret = (char __user *)out - buf;
199 static struct file_operations proc_kpageflags_operations = {
201 .read = kpageflags_read,
203 #endif /* CONFIG_PROC_PAGE_MONITOR */
205 struct proc_dir_entry *proc_root_kcore;
207 void __init proc_misc_init(void)
209 proc_symlink("mounts", NULL, "self/mounts");
211 /* And now for trickier ones */
212 #ifdef CONFIG_MODULES
213 proc_create("modules", 0, NULL, &proc_modules_operations);
215 #ifdef CONFIG_SCHEDSTATS
216 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
218 #ifdef CONFIG_PROC_KCORE
219 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
221 proc_root_kcore->size =
222 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
224 #ifdef CONFIG_PROC_PAGE_MONITOR
225 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
226 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
228 #ifdef CONFIG_PROC_VMCORE
229 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);