#include <linux/bootmem.h> #include <linux/compiler.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/mmzone.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <asm/uaccess.h> #include "internal.h" #define KPMSIZE sizeof(u64) #define KPMMASK (KPMSIZE - 1) /* /proc/kpagecount - an array exposing page counts * * Each entry is a u64 representing the corresponding * physical page count. */ static ssize_t kpagecount_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { u64 __user *out = (u64 __user *)buf; struct page *ppage; unsigned long src = *ppos; unsigned long pfn; ssize_t ret = 0; u64 pcount; pfn = src / KPMSIZE; count = min_t(size_t, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) return -EINVAL; while (count > 0) { ppage = NULL; if (pfn_valid(pfn)) ppage = pfn_to_page(pfn); pfn++; if (!ppage) pcount = 0; else pcount = page_mapcount(ppage); if (put_user(pcount, out++)) { ret = -EFAULT; break; } count -= KPMSIZE; } *ppos += (char __user *)out - buf; if (!ret) ret = (char __user *)out - buf; return ret; } static const struct file_operations proc_kpagecount_operations = { .llseek = mem_lseek, .read = kpagecount_read, }; /* /proc/kpageflags - an array exposing page flags * * Each entry is a u64 representing the corresponding * physical page flags. */ /* These macros are used to decouple internal flags from exported ones */ #define KPF_LOCKED 0 #define KPF_ERROR 1 #define KPF_REFERENCED 2 #define KPF_UPTODATE 3 #define KPF_DIRTY 4 #define KPF_LRU 5 #define KPF_ACTIVE 6 #define KPF_SLAB 7 #define KPF_WRITEBACK 8 #define KPF_RECLAIM 9 #define KPF_BUDDY 10 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos) static ssize_t kpageflags_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { u64 __user *out = (u64 __user *)buf; struct page *ppage; unsigned long src = *ppos; unsigned long pfn; ssize_t ret = 0; u64 kflags, uflags; pfn = src / KPMSIZE; count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) return -EINVAL; while (count > 0) { ppage = NULL; if (pfn_valid(pfn)) ppage = pfn_to_page(pfn); pfn++; if (!ppage) kflags = 0; else kflags = ppage->flags; uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) | kpf_copy_bit(kflags, KPF_ERROR, PG_error) | kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) | kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) | kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) | kpf_copy_bit(kflags, KPF_LRU, PG_lru) | kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) | kpf_copy_bit(kflags, KPF_SLAB, PG_slab) | kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) | kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) | kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy); if (put_user(uflags, out++)) { ret = -EFAULT; break; } count -= KPMSIZE; } *ppos += (char __user *)out - buf; if (!ret) ret = (char __user *)out - buf; return ret; } static const struct file_operations proc_kpageflags_operations = { .llseek = mem_lseek, .read = kpageflags_read, }; static int __init proc_page_init(void) { proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations); proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations); return 0; } module_init(proc_page_init);