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page.c
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#include <linux/bootmem.h> #include <linux/compiler.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/ksm.h> #include <linux/mm.h> #include <linux/mmzone.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/hugetlb.h> #include <linux/kernel-page-flags.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) { if (pfn_valid(pfn)) ppage = pfn_to_page(pfn); else ppage = NULL; if (!ppage || PageSlab(ppage)) pcount = 0; else pcount = page_mapcount(ppage); if (put_user(pcount, out)) { ret = -EFAULT; break; } pfn++; out++; 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. */ static inline u64 kpf_copy_bit(u64 kflags, int ubit, int kbit) { return ((kflags >> kbit) & 1) << ubit; } u64 stable_page_flags(struct page *page) { u64 k; u64 u; /* * pseudo flag: KPF_NOPAGE * it differentiates a memory hole from a page with no flags */ if (!page) return 1 << KPF_NOPAGE; k = page->flags; u = 0; /* * pseudo flags for the well known (anonymous) memory mapped pages * * Note that page->_mapcount is overloaded in SLOB/SLUB/SLQB, so the * simple test in page_mapped() is not enough. */ if (!PageSlab(page) && page_mapped(page)) u |= 1 << KPF_MMAP; if (PageAnon(page)) u |= 1 << KPF_ANON; if (PageKsm(page)) u |= 1 << KPF_KSM; /* * compound pages: export both head/tail info * they together define a compound page's start/end pos and order */ if (PageHead(page)) u |= 1 << KPF_COMPOUND_HEAD; if (PageTail(page)) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; /* * PageTransCompound can be true for non-huge compound pages (slab * pages or pages allocated by drivers with __GFP_COMP) because it * just checks PG_head/PG_tail, so we need to check PageLRU to make * sure a given page is a thp, not a non-huge compound page. */ else if (PageTransCompound(page) && PageLRU(compound_head(page))) u |= 1 << KPF_THP; /* * Caveats on high order pages: page->_count will only be set * -1 on the head page; SLUB/SLQB do the same for PG_slab; * SLOB won't set PG_slab at all on compound pages. */ if (PageBuddy(page)) u |= 1 << KPF_BUDDY; u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked); u |= kpf_copy_bit(k, KPF_SLAB, PG_slab); u |= kpf_copy_bit(k, KPF_ERROR, PG_error); u |= kpf_copy_bit(k, KPF_DIRTY, PG_dirty); u |= kpf_copy_bit(k, KPF_UPTODATE, PG_uptodate); u |= kpf_copy_bit(k, KPF_WRITEBACK, PG_writeback); u |= kpf_copy_bit(k, KPF_LRU, PG_lru); u |= kpf_copy_bit(k, KPF_REFERENCED, PG_referenced); u |= kpf_copy_bit(k, KPF_ACTIVE, PG_active); u |= kpf_copy_bit(k, KPF_RECLAIM, PG_reclaim); u |= kpf_copy_bit(k, KPF_SWAPCACHE, PG_swapcache); u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked); u |= kpf_copy_bit(k, KPF_UNEVICTABLE, PG_unevictable); u |= kpf_copy_bit(k, KPF_MLOCKED, PG_mlocked); #ifdef CONFIG_MEMORY_FAILURE u |= kpf_copy_bit(k, KPF_HWPOISON, PG_hwpoison); #endif #ifdef CONFIG_ARCH_USES_PG_UNCACHED u |= kpf_copy_bit(k, KPF_UNCACHED, PG_uncached); #endif u |= kpf_copy_bit(k, KPF_RESERVED, PG_reserved); u |= kpf_copy_bit(k, KPF_MAPPEDTODISK, PG_mappedtodisk); u |= kpf_copy_bit(k, KPF_PRIVATE, PG_private); u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2); u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1); u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1); return u; }; 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; pfn = src / KPMSIZE; count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) return -EINVAL; while (count > 0) { if (pfn_valid(pfn)) ppage = pfn_to_page(pfn); else ppage = NULL; if (put_user(stable_page_flags(ppage), out)) { ret = -EFAULT; break; } pfn++; out++; 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);
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