1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 248c96a36SJoonsoo Kim #include <linux/debugfs.h> 348c96a36SJoonsoo Kim #include <linux/mm.h> 448c96a36SJoonsoo Kim #include <linux/slab.h> 548c96a36SJoonsoo Kim #include <linux/uaccess.h> 657c8a661SMike Rapoport #include <linux/memblock.h> 748c96a36SJoonsoo Kim #include <linux/stacktrace.h> 848c96a36SJoonsoo Kim #include <linux/page_owner.h> 97dd80b8aSVlastimil Babka #include <linux/jump_label.h> 107cd12b4aSVlastimil Babka #include <linux/migrate.h> 11f2ca0b55SJoonsoo Kim #include <linux/stackdepot.h> 12e2f612e6SJoonsoo Kim #include <linux/seq_file.h> 13fcf89358SWaiman Long #include <linux/memcontrol.h> 149cc7e96aSLiam Mark #include <linux/sched/clock.h> 15f2ca0b55SJoonsoo Kim 1648c96a36SJoonsoo Kim #include "internal.h" 1748c96a36SJoonsoo Kim 18f2ca0b55SJoonsoo Kim /* 19f2ca0b55SJoonsoo Kim * TODO: teach PAGE_OWNER_STACK_DEPTH (__dump_page_owner and save_stack) 20f2ca0b55SJoonsoo Kim * to use off stack temporal storage 21f2ca0b55SJoonsoo Kim */ 22f2ca0b55SJoonsoo Kim #define PAGE_OWNER_STACK_DEPTH (16) 23f2ca0b55SJoonsoo Kim 249300d8dfSJoonsoo Kim struct page_owner { 256b4c54e3SAyush Mittal unsigned short order; 266b4c54e3SAyush Mittal short last_migrate_reason; 279300d8dfSJoonsoo Kim gfp_t gfp_mask; 289300d8dfSJoonsoo Kim depot_stack_handle_t handle; 298974558fSVlastimil Babka depot_stack_handle_t free_handle; 309cc7e96aSLiam Mark u64 ts_nsec; 31866b4852SGeorgi Djakov u64 free_ts_nsec; 32865ed6a3SWaiman Long char comm[TASK_COMM_LEN]; 339cc7e96aSLiam Mark pid_t pid; 34bf215eabSYixuan Cao pid_t tgid; 351b5c65b6SBarry Song pid_t free_pid; 361b5c65b6SBarry Song pid_t free_tgid; 379300d8dfSJoonsoo Kim }; 389300d8dfSJoonsoo Kim 394bedfb31SOscar Salvador struct stack { 404bedfb31SOscar Salvador struct stack_record *stack_record; 414bedfb31SOscar Salvador struct stack *next; 424bedfb31SOscar Salvador }; 434bedfb31SOscar Salvador static struct stack dummy_stack; 444bedfb31SOscar Salvador static struct stack failure_stack; 454bedfb31SOscar Salvador static struct stack *stack_list; 46217b2119SOscar Salvador static DEFINE_SPINLOCK(stack_list_lock); 474bedfb31SOscar Salvador 483645b5ecSFanjun Kong static bool page_owner_enabled __initdata; 497dd80b8aSVlastimil Babka DEFINE_STATIC_KEY_FALSE(page_owner_inited); 5048c96a36SJoonsoo Kim 51f2ca0b55SJoonsoo Kim static depot_stack_handle_t dummy_handle; 52f2ca0b55SJoonsoo Kim static depot_stack_handle_t failure_handle; 53dab4ead1SVlastimil Babka static depot_stack_handle_t early_handle; 54f2ca0b55SJoonsoo Kim 5561cf5febSJoonsoo Kim static void init_early_allocated_pages(void); 5661cf5febSJoonsoo Kim 57*7844c014SOscar Salvador static inline void set_current_in_page_owner(void) 58*7844c014SOscar Salvador { 59*7844c014SOscar Salvador /* 60*7844c014SOscar Salvador * Avoid recursion. 61*7844c014SOscar Salvador * 62*7844c014SOscar Salvador * We might need to allocate more memory from page_owner code, so make 63*7844c014SOscar Salvador * sure to signal it in order to avoid recursion. 64*7844c014SOscar Salvador */ 65*7844c014SOscar Salvador current->in_page_owner = 1; 66*7844c014SOscar Salvador } 67*7844c014SOscar Salvador 68*7844c014SOscar Salvador static inline void unset_current_in_page_owner(void) 69*7844c014SOscar Salvador { 70*7844c014SOscar Salvador current->in_page_owner = 0; 71*7844c014SOscar Salvador } 72*7844c014SOscar Salvador 731173194eSDou Liyang static int __init early_page_owner_param(char *buf) 7448c96a36SJoonsoo Kim { 75a5f1783bSVlastimil Babka int ret = kstrtobool(buf, &page_owner_enabled); 76a5f1783bSVlastimil Babka 77a5f1783bSVlastimil Babka if (page_owner_enabled) 781c0310adSAndrey Konovalov stack_depot_request_early_init(); 79a5f1783bSVlastimil Babka 80a5f1783bSVlastimil Babka return ret; 8148c96a36SJoonsoo Kim } 8248c96a36SJoonsoo Kim early_param("page_owner", early_page_owner_param); 8348c96a36SJoonsoo Kim 84cab0a7c1STing Liu static __init bool need_page_owner(void) 8548c96a36SJoonsoo Kim { 860fe9a448SVlastimil Babka return page_owner_enabled; 8748c96a36SJoonsoo Kim } 8848c96a36SJoonsoo Kim 89dab4ead1SVlastimil Babka static __always_inline depot_stack_handle_t create_dummy_stack(void) 90f2ca0b55SJoonsoo Kim { 91f2ca0b55SJoonsoo Kim unsigned long entries[4]; 92af52bf6bSThomas Gleixner unsigned int nr_entries; 93f2ca0b55SJoonsoo Kim 94af52bf6bSThomas Gleixner nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); 95af52bf6bSThomas Gleixner return stack_depot_save(entries, nr_entries, GFP_KERNEL); 96dab4ead1SVlastimil Babka } 97dab4ead1SVlastimil Babka 98dab4ead1SVlastimil Babka static noinline void register_dummy_stack(void) 99dab4ead1SVlastimil Babka { 100dab4ead1SVlastimil Babka dummy_handle = create_dummy_stack(); 101f2ca0b55SJoonsoo Kim } 102f2ca0b55SJoonsoo Kim 103f2ca0b55SJoonsoo Kim static noinline void register_failure_stack(void) 104f2ca0b55SJoonsoo Kim { 105dab4ead1SVlastimil Babka failure_handle = create_dummy_stack(); 106dab4ead1SVlastimil Babka } 107f2ca0b55SJoonsoo Kim 108dab4ead1SVlastimil Babka static noinline void register_early_stack(void) 109dab4ead1SVlastimil Babka { 110dab4ead1SVlastimil Babka early_handle = create_dummy_stack(); 111f2ca0b55SJoonsoo Kim } 112f2ca0b55SJoonsoo Kim 113cab0a7c1STing Liu static __init void init_page_owner(void) 11448c96a36SJoonsoo Kim { 1150fe9a448SVlastimil Babka if (!page_owner_enabled) 11648c96a36SJoonsoo Kim return; 11748c96a36SJoonsoo Kim 118f2ca0b55SJoonsoo Kim register_dummy_stack(); 119f2ca0b55SJoonsoo Kim register_failure_stack(); 120dab4ead1SVlastimil Babka register_early_stack(); 1217dd80b8aSVlastimil Babka static_branch_enable(&page_owner_inited); 12261cf5febSJoonsoo Kim init_early_allocated_pages(); 1234bedfb31SOscar Salvador /* Initialize dummy and failure stacks and link them to stack_list */ 1244bedfb31SOscar Salvador dummy_stack.stack_record = __stack_depot_get_stack_record(dummy_handle); 1254bedfb31SOscar Salvador failure_stack.stack_record = __stack_depot_get_stack_record(failure_handle); 12684d6ac31SOscar Salvador if (dummy_stack.stack_record) 1274bedfb31SOscar Salvador refcount_set(&dummy_stack.stack_record->count, 1); 12884d6ac31SOscar Salvador if (failure_stack.stack_record) 1294bedfb31SOscar Salvador refcount_set(&failure_stack.stack_record->count, 1); 1304bedfb31SOscar Salvador dummy_stack.next = &failure_stack; 1314bedfb31SOscar Salvador stack_list = &dummy_stack; 13248c96a36SJoonsoo Kim } 13348c96a36SJoonsoo Kim 13448c96a36SJoonsoo Kim struct page_ext_operations page_owner_ops = { 1359300d8dfSJoonsoo Kim .size = sizeof(struct page_owner), 13648c96a36SJoonsoo Kim .need = need_page_owner, 13748c96a36SJoonsoo Kim .init = init_page_owner, 1386189eb82SPasha Tatashin .need_shared_flags = true, 13948c96a36SJoonsoo Kim }; 14048c96a36SJoonsoo Kim 1419300d8dfSJoonsoo Kim static inline struct page_owner *get_page_owner(struct page_ext *page_ext) 1429300d8dfSJoonsoo Kim { 1431cac4c07SKemeng Shi return page_ext_data(page_ext, &page_owner_ops); 1449300d8dfSJoonsoo Kim } 1459300d8dfSJoonsoo Kim 146f2ca0b55SJoonsoo Kim static noinline depot_stack_handle_t save_stack(gfp_t flags) 147f2ca0b55SJoonsoo Kim { 148f2ca0b55SJoonsoo Kim unsigned long entries[PAGE_OWNER_STACK_DEPTH]; 149f2ca0b55SJoonsoo Kim depot_stack_handle_t handle; 150af52bf6bSThomas Gleixner unsigned int nr_entries; 151f2ca0b55SJoonsoo Kim 1528e9b16c4SSergei Trofimovich if (current->in_page_owner) 153f2ca0b55SJoonsoo Kim return dummy_handle; 154f2ca0b55SJoonsoo Kim 155*7844c014SOscar Salvador set_current_in_page_owner(); 1568e9b16c4SSergei Trofimovich nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 2); 157af52bf6bSThomas Gleixner handle = stack_depot_save(entries, nr_entries, flags); 158f2ca0b55SJoonsoo Kim if (!handle) 159f2ca0b55SJoonsoo Kim handle = failure_handle; 160*7844c014SOscar Salvador unset_current_in_page_owner(); 161f2ca0b55SJoonsoo Kim 162f2ca0b55SJoonsoo Kim return handle; 163f2ca0b55SJoonsoo Kim } 164f2ca0b55SJoonsoo Kim 165217b2119SOscar Salvador static void add_stack_record_to_list(struct stack_record *stack_record, 166217b2119SOscar Salvador gfp_t gfp_mask) 167217b2119SOscar Salvador { 168217b2119SOscar Salvador unsigned long flags; 169217b2119SOscar Salvador struct stack *stack; 170217b2119SOscar Salvador 171217b2119SOscar Salvador /* Filter gfp_mask the same way stackdepot does, for consistency */ 172217b2119SOscar Salvador gfp_mask &= ~GFP_ZONEMASK; 173217b2119SOscar Salvador gfp_mask &= (GFP_ATOMIC | GFP_KERNEL); 174217b2119SOscar Salvador gfp_mask |= __GFP_NOWARN; 175217b2119SOscar Salvador 176*7844c014SOscar Salvador set_current_in_page_owner(); 177217b2119SOscar Salvador stack = kmalloc(sizeof(*stack), gfp_mask); 178*7844c014SOscar Salvador if (!stack) { 179*7844c014SOscar Salvador unset_current_in_page_owner(); 180217b2119SOscar Salvador return; 181*7844c014SOscar Salvador } 182*7844c014SOscar Salvador unset_current_in_page_owner(); 183217b2119SOscar Salvador 184217b2119SOscar Salvador stack->stack_record = stack_record; 185217b2119SOscar Salvador stack->next = NULL; 186217b2119SOscar Salvador 187217b2119SOscar Salvador spin_lock_irqsave(&stack_list_lock, flags); 188217b2119SOscar Salvador stack->next = stack_list; 189765973a0SOscar Salvador /* 190765973a0SOscar Salvador * This pairs with smp_load_acquire() from function 191765973a0SOscar Salvador * stack_start(). This guarantees that stack_start() 192765973a0SOscar Salvador * will see an updated stack_list before starting to 193765973a0SOscar Salvador * traverse the list. 194765973a0SOscar Salvador */ 195765973a0SOscar Salvador smp_store_release(&stack_list, stack); 196217b2119SOscar Salvador spin_unlock_irqrestore(&stack_list_lock, flags); 197217b2119SOscar Salvador } 198217b2119SOscar Salvador 199217b2119SOscar Salvador static void inc_stack_record_count(depot_stack_handle_t handle, gfp_t gfp_mask) 200217b2119SOscar Salvador { 201217b2119SOscar Salvador struct stack_record *stack_record = __stack_depot_get_stack_record(handle); 202217b2119SOscar Salvador 203217b2119SOscar Salvador if (!stack_record) 204217b2119SOscar Salvador return; 205217b2119SOscar Salvador 206217b2119SOscar Salvador /* 207217b2119SOscar Salvador * New stack_record's that do not use STACK_DEPOT_FLAG_GET start 208217b2119SOscar Salvador * with REFCOUNT_SATURATED to catch spurious increments of their 209217b2119SOscar Salvador * refcount. 210217b2119SOscar Salvador * Since we do not use STACK_DEPOT_FLAG_GET API, let us 211217b2119SOscar Salvador * set a refcount of 1 ourselves. 212217b2119SOscar Salvador */ 213217b2119SOscar Salvador if (refcount_read(&stack_record->count) == REFCOUNT_SATURATED) { 214217b2119SOscar Salvador int old = REFCOUNT_SATURATED; 215217b2119SOscar Salvador 216217b2119SOscar Salvador if (atomic_try_cmpxchg_relaxed(&stack_record->count.refs, &old, 1)) 217217b2119SOscar Salvador /* Add the new stack_record to our list */ 218217b2119SOscar Salvador add_stack_record_to_list(stack_record, gfp_mask); 219217b2119SOscar Salvador } 220217b2119SOscar Salvador refcount_inc(&stack_record->count); 221217b2119SOscar Salvador } 222217b2119SOscar Salvador 223217b2119SOscar Salvador static void dec_stack_record_count(depot_stack_handle_t handle) 224217b2119SOscar Salvador { 225217b2119SOscar Salvador struct stack_record *stack_record = __stack_depot_get_stack_record(handle); 226217b2119SOscar Salvador 227217b2119SOscar Salvador if (stack_record) 228217b2119SOscar Salvador refcount_dec(&stack_record->count); 229217b2119SOscar Salvador } 230217b2119SOscar Salvador 2310093de69SYixuan Cao void __reset_page_owner(struct page *page, unsigned short order) 2328974558fSVlastimil Babka { 2338974558fSVlastimil Babka int i; 2348974558fSVlastimil Babka struct page_ext *page_ext; 235fab765c2SSergei Trofimovich depot_stack_handle_t handle; 236217b2119SOscar Salvador depot_stack_handle_t alloc_handle; 2378974558fSVlastimil Babka struct page_owner *page_owner; 238866b4852SGeorgi Djakov u64 free_ts_nsec = local_clock(); 2398974558fSVlastimil Babka 240b1d5488aSCharan Teja Kalla page_ext = page_ext_get(page); 2418974558fSVlastimil Babka if (unlikely(!page_ext)) 2425556cfe8SVlastimil Babka return; 243fab765c2SSergei Trofimovich 244217b2119SOscar Salvador page_owner = get_page_owner(page_ext); 245217b2119SOscar Salvador alloc_handle = page_owner->handle; 246217b2119SOscar Salvador 247fab765c2SSergei Trofimovich handle = save_stack(GFP_NOWAIT | __GFP_NOWARN); 2485556cfe8SVlastimil Babka for (i = 0; i < (1 << order); i++) { 249fdf3bf80SVlastimil Babka __clear_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags); 2508974558fSVlastimil Babka page_owner->free_handle = handle; 251866b4852SGeorgi Djakov page_owner->free_ts_nsec = free_ts_nsec; 2521b5c65b6SBarry Song page_owner->free_pid = current->pid; 2531b5c65b6SBarry Song page_owner->free_tgid = current->tgid; 2545556cfe8SVlastimil Babka page_ext = page_ext_next(page_ext); 255217b2119SOscar Salvador page_owner = get_page_owner(page_ext); 2568974558fSVlastimil Babka } 257b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 258217b2119SOscar Salvador if (alloc_handle != early_handle) 259217b2119SOscar Salvador /* 260217b2119SOscar Salvador * early_handle is being set as a handle for all those 261217b2119SOscar Salvador * early allocated pages. See init_pages_in_zone(). 262217b2119SOscar Salvador * Since their refcount is not being incremented because 263217b2119SOscar Salvador * the machinery is not ready yet, we cannot decrement 264217b2119SOscar Salvador * their refcount either. 265217b2119SOscar Salvador */ 266217b2119SOscar Salvador dec_stack_record_count(alloc_handle); 2678974558fSVlastimil Babka } 2688974558fSVlastimil Babka 26964ea78d2Szhongjiang-ali static inline void __set_page_owner_handle(struct page_ext *page_ext, 27064ea78d2Szhongjiang-ali depot_stack_handle_t handle, 2710093de69SYixuan Cao unsigned short order, gfp_t gfp_mask) 272f2ca0b55SJoonsoo Kim { 2739300d8dfSJoonsoo Kim struct page_owner *page_owner; 2747e2f2a0cSVlastimil Babka int i; 27505a42199SHyeonggon Yoo u64 ts_nsec = local_clock(); 27648c96a36SJoonsoo Kim 2777e2f2a0cSVlastimil Babka for (i = 0; i < (1 << order); i++) { 2789300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 279dab4ead1SVlastimil Babka page_owner->handle = handle; 2809300d8dfSJoonsoo Kim page_owner->order = order; 2819300d8dfSJoonsoo Kim page_owner->gfp_mask = gfp_mask; 2829300d8dfSJoonsoo Kim page_owner->last_migrate_reason = -1; 2839cc7e96aSLiam Mark page_owner->pid = current->pid; 284bf215eabSYixuan Cao page_owner->tgid = current->tgid; 28505a42199SHyeonggon Yoo page_owner->ts_nsec = ts_nsec; 286cd8c1fd8SEric Dumazet strscpy(page_owner->comm, current->comm, 287865ed6a3SWaiman Long sizeof(page_owner->comm)); 28848c96a36SJoonsoo Kim __set_bit(PAGE_EXT_OWNER, &page_ext->flags); 289fdf3bf80SVlastimil Babka __set_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags); 2907e2f2a0cSVlastimil Babka 2915556cfe8SVlastimil Babka page_ext = page_ext_next(page_ext); 2927e2f2a0cSVlastimil Babka } 29348c96a36SJoonsoo Kim } 29448c96a36SJoonsoo Kim 2950093de69SYixuan Cao noinline void __set_page_owner(struct page *page, unsigned short order, 296dab4ead1SVlastimil Babka gfp_t gfp_mask) 297dab4ead1SVlastimil Babka { 298b1d5488aSCharan Teja Kalla struct page_ext *page_ext; 299dab4ead1SVlastimil Babka depot_stack_handle_t handle; 300dab4ead1SVlastimil Babka 301b1d5488aSCharan Teja Kalla handle = save_stack(gfp_mask); 302b1d5488aSCharan Teja Kalla 303b1d5488aSCharan Teja Kalla page_ext = page_ext_get(page); 304dab4ead1SVlastimil Babka if (unlikely(!page_ext)) 305dab4ead1SVlastimil Babka return; 30664ea78d2Szhongjiang-ali __set_page_owner_handle(page_ext, handle, order, gfp_mask); 307b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 308217b2119SOscar Salvador inc_stack_record_count(handle, gfp_mask); 309dab4ead1SVlastimil Babka } 310dab4ead1SVlastimil Babka 3117cd12b4aSVlastimil Babka void __set_page_owner_migrate_reason(struct page *page, int reason) 3127cd12b4aSVlastimil Babka { 313b1d5488aSCharan Teja Kalla struct page_ext *page_ext = page_ext_get(page); 3149300d8dfSJoonsoo Kim struct page_owner *page_owner; 3159300d8dfSJoonsoo Kim 316f86e4271SYang Shi if (unlikely(!page_ext)) 317f86e4271SYang Shi return; 3187cd12b4aSVlastimil Babka 3199300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 3209300d8dfSJoonsoo Kim page_owner->last_migrate_reason = reason; 321b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 3227cd12b4aSVlastimil Babka } 3237cd12b4aSVlastimil Babka 32446d44d09SZi Yan void __split_page_owner(struct page *page, int old_order, int new_order) 325e2cfc911SJoonsoo Kim { 326a9627bc5SJoonsoo Kim int i; 327b1d5488aSCharan Teja Kalla struct page_ext *page_ext = page_ext_get(page); 3289300d8dfSJoonsoo Kim struct page_owner *page_owner; 329e2cfc911SJoonsoo Kim 330a9627bc5SJoonsoo Kim if (unlikely(!page_ext)) 331a9627bc5SJoonsoo Kim return; 332a9627bc5SJoonsoo Kim 33346d44d09SZi Yan for (i = 0; i < (1 << old_order); i++) { 3349300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 33546d44d09SZi Yan page_owner->order = new_order; 3365556cfe8SVlastimil Babka page_ext = page_ext_next(page_ext); 3377e2f2a0cSVlastimil Babka } 338b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 339e2cfc911SJoonsoo Kim } 340e2cfc911SJoonsoo Kim 34119138349SMatthew Wilcox (Oracle) void __folio_copy_owner(struct folio *newfolio, struct folio *old) 342d435edcaSVlastimil Babka { 343b1d5488aSCharan Teja Kalla struct page_ext *old_ext; 344b1d5488aSCharan Teja Kalla struct page_ext *new_ext; 3459300d8dfSJoonsoo Kim struct page_owner *old_page_owner, *new_page_owner; 346d435edcaSVlastimil Babka 347b1d5488aSCharan Teja Kalla old_ext = page_ext_get(&old->page); 348b1d5488aSCharan Teja Kalla if (unlikely(!old_ext)) 349f86e4271SYang Shi return; 350f86e4271SYang Shi 351b1d5488aSCharan Teja Kalla new_ext = page_ext_get(&newfolio->page); 352b1d5488aSCharan Teja Kalla if (unlikely(!new_ext)) { 353b1d5488aSCharan Teja Kalla page_ext_put(old_ext); 354b1d5488aSCharan Teja Kalla return; 355b1d5488aSCharan Teja Kalla } 356b1d5488aSCharan Teja Kalla 3579300d8dfSJoonsoo Kim old_page_owner = get_page_owner(old_ext); 3589300d8dfSJoonsoo Kim new_page_owner = get_page_owner(new_ext); 3599300d8dfSJoonsoo Kim new_page_owner->order = old_page_owner->order; 3609300d8dfSJoonsoo Kim new_page_owner->gfp_mask = old_page_owner->gfp_mask; 3619300d8dfSJoonsoo Kim new_page_owner->last_migrate_reason = 3629300d8dfSJoonsoo Kim old_page_owner->last_migrate_reason; 3639300d8dfSJoonsoo Kim new_page_owner->handle = old_page_owner->handle; 3649cc7e96aSLiam Mark new_page_owner->pid = old_page_owner->pid; 365bf215eabSYixuan Cao new_page_owner->tgid = old_page_owner->tgid; 3661b5c65b6SBarry Song new_page_owner->free_pid = old_page_owner->free_pid; 3671b5c65b6SBarry Song new_page_owner->free_tgid = old_page_owner->free_tgid; 3689cc7e96aSLiam Mark new_page_owner->ts_nsec = old_page_owner->ts_nsec; 369866b4852SGeorgi Djakov new_page_owner->free_ts_nsec = old_page_owner->ts_nsec; 370865ed6a3SWaiman Long strcpy(new_page_owner->comm, old_page_owner->comm); 371d435edcaSVlastimil Babka 372d435edcaSVlastimil Babka /* 37319138349SMatthew Wilcox (Oracle) * We don't clear the bit on the old folio as it's going to be freed 374d435edcaSVlastimil Babka * after migration. Until then, the info can be useful in case of 375f0953a1bSIngo Molnar * a bug, and the overall stats will be off a bit only temporarily. 376d435edcaSVlastimil Babka * Also, migrate_misplaced_transhuge_page() can still fail the 37719138349SMatthew Wilcox (Oracle) * migration and then we want the old folio to retain the info. But 378d435edcaSVlastimil Babka * in that case we also don't need to explicitly clear the info from 379d435edcaSVlastimil Babka * the new page, which will be freed. 380d435edcaSVlastimil Babka */ 381d435edcaSVlastimil Babka __set_bit(PAGE_EXT_OWNER, &new_ext->flags); 382fdf3bf80SVlastimil Babka __set_bit(PAGE_EXT_OWNER_ALLOCATED, &new_ext->flags); 383b1d5488aSCharan Teja Kalla page_ext_put(new_ext); 384b1d5488aSCharan Teja Kalla page_ext_put(old_ext); 385d435edcaSVlastimil Babka } 386d435edcaSVlastimil Babka 387e2f612e6SJoonsoo Kim void pagetypeinfo_showmixedcount_print(struct seq_file *m, 388e2f612e6SJoonsoo Kim pg_data_t *pgdat, struct zone *zone) 389e2f612e6SJoonsoo Kim { 390e2f612e6SJoonsoo Kim struct page *page; 391e2f612e6SJoonsoo Kim struct page_ext *page_ext; 3929300d8dfSJoonsoo Kim struct page_owner *page_owner; 3931d2cae8eSMiaohe Lin unsigned long pfn, block_end_pfn; 3941d2cae8eSMiaohe Lin unsigned long end_pfn = zone_end_pfn(zone); 395e2f612e6SJoonsoo Kim unsigned long count[MIGRATE_TYPES] = { 0, }; 396e2f612e6SJoonsoo Kim int pageblock_mt, page_mt; 397e2f612e6SJoonsoo Kim int i; 398e2f612e6SJoonsoo Kim 399e2f612e6SJoonsoo Kim /* Scan block by block. First and last block may be incomplete */ 400e2f612e6SJoonsoo Kim pfn = zone->zone_start_pfn; 401e2f612e6SJoonsoo Kim 402e2f612e6SJoonsoo Kim /* 403e2f612e6SJoonsoo Kim * Walk the zone in pageblock_nr_pages steps. If a page block spans 404e2f612e6SJoonsoo Kim * a zone boundary, it will be double counted between zones. This does 405e2f612e6SJoonsoo Kim * not matter as the mixed block count will still be correct 406e2f612e6SJoonsoo Kim */ 407e2f612e6SJoonsoo Kim for (; pfn < end_pfn; ) { 408a26ee565SQian Cai page = pfn_to_online_page(pfn); 409a26ee565SQian Cai if (!page) { 410e2f612e6SJoonsoo Kim pfn = ALIGN(pfn + 1, MAX_ORDER_NR_PAGES); 411e2f612e6SJoonsoo Kim continue; 412e2f612e6SJoonsoo Kim } 413e2f612e6SJoonsoo Kim 4144f9bc69aSKefeng Wang block_end_pfn = pageblock_end_pfn(pfn); 415e2f612e6SJoonsoo Kim block_end_pfn = min(block_end_pfn, end_pfn); 416e2f612e6SJoonsoo Kim 417e2f612e6SJoonsoo Kim pageblock_mt = get_pageblock_migratetype(page); 418e2f612e6SJoonsoo Kim 419e2f612e6SJoonsoo Kim for (; pfn < block_end_pfn; pfn++) { 420a26ee565SQian Cai /* The pageblock is online, no need to recheck. */ 421e2f612e6SJoonsoo Kim page = pfn_to_page(pfn); 422e2f612e6SJoonsoo Kim 423e2f612e6SJoonsoo Kim if (page_zone(page) != zone) 424e2f612e6SJoonsoo Kim continue; 425e2f612e6SJoonsoo Kim 426e2f612e6SJoonsoo Kim if (PageBuddy(page)) { 427727c080fSVinayak Menon unsigned long freepage_order; 428727c080fSVinayak Menon 429ab130f91SMatthew Wilcox (Oracle) freepage_order = buddy_order_unsafe(page); 4305e0a760bSKirill A. Shutemov if (freepage_order <= MAX_PAGE_ORDER) 431727c080fSVinayak Menon pfn += (1UL << freepage_order) - 1; 432e2f612e6SJoonsoo Kim continue; 433e2f612e6SJoonsoo Kim } 434e2f612e6SJoonsoo Kim 435e2f612e6SJoonsoo Kim if (PageReserved(page)) 436e2f612e6SJoonsoo Kim continue; 437e2f612e6SJoonsoo Kim 438b1d5488aSCharan Teja Kalla page_ext = page_ext_get(page); 439e2f612e6SJoonsoo Kim if (unlikely(!page_ext)) 440e2f612e6SJoonsoo Kim continue; 441e2f612e6SJoonsoo Kim 442fdf3bf80SVlastimil Babka if (!test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags)) 443b1d5488aSCharan Teja Kalla goto ext_put_continue; 444e2f612e6SJoonsoo Kim 4459300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 44601c0bfe0SWei Yang page_mt = gfp_migratetype(page_owner->gfp_mask); 447e2f612e6SJoonsoo Kim if (pageblock_mt != page_mt) { 448e2f612e6SJoonsoo Kim if (is_migrate_cma(pageblock_mt)) 449e2f612e6SJoonsoo Kim count[MIGRATE_MOVABLE]++; 450e2f612e6SJoonsoo Kim else 451e2f612e6SJoonsoo Kim count[pageblock_mt]++; 452e2f612e6SJoonsoo Kim 453e2f612e6SJoonsoo Kim pfn = block_end_pfn; 454b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 455e2f612e6SJoonsoo Kim break; 456e2f612e6SJoonsoo Kim } 4579300d8dfSJoonsoo Kim pfn += (1UL << page_owner->order) - 1; 458b1d5488aSCharan Teja Kalla ext_put_continue: 459b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 460e2f612e6SJoonsoo Kim } 461e2f612e6SJoonsoo Kim } 462e2f612e6SJoonsoo Kim 463e2f612e6SJoonsoo Kim /* Print counts */ 464e2f612e6SJoonsoo Kim seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); 465e2f612e6SJoonsoo Kim for (i = 0; i < MIGRATE_TYPES; i++) 466e2f612e6SJoonsoo Kim seq_printf(m, "%12lu ", count[i]); 467e2f612e6SJoonsoo Kim seq_putc(m, '\n'); 468e2f612e6SJoonsoo Kim } 469e2f612e6SJoonsoo Kim 470fcf89358SWaiman Long /* 471fcf89358SWaiman Long * Looking for memcg information and print it out 472fcf89358SWaiman Long */ 473fcf89358SWaiman Long static inline int print_page_owner_memcg(char *kbuf, size_t count, int ret, 474fcf89358SWaiman Long struct page *page) 475fcf89358SWaiman Long { 476fcf89358SWaiman Long #ifdef CONFIG_MEMCG 477fcf89358SWaiman Long unsigned long memcg_data; 478fcf89358SWaiman Long struct mem_cgroup *memcg; 479fcf89358SWaiman Long bool online; 480fcf89358SWaiman Long char name[80]; 481fcf89358SWaiman Long 482fcf89358SWaiman Long rcu_read_lock(); 483fcf89358SWaiman Long memcg_data = READ_ONCE(page->memcg_data); 484fcf89358SWaiman Long if (!memcg_data) 485fcf89358SWaiman Long goto out_unlock; 486fcf89358SWaiman Long 487fcf89358SWaiman Long if (memcg_data & MEMCG_DATA_OBJCGS) 488fcf89358SWaiman Long ret += scnprintf(kbuf + ret, count - ret, 489fcf89358SWaiman Long "Slab cache page\n"); 490fcf89358SWaiman Long 491fcf89358SWaiman Long memcg = page_memcg_check(page); 492fcf89358SWaiman Long if (!memcg) 493fcf89358SWaiman Long goto out_unlock; 494fcf89358SWaiman Long 495fcf89358SWaiman Long online = (memcg->css.flags & CSS_ONLINE); 496fcf89358SWaiman Long cgroup_name(memcg->css.cgroup, name, sizeof(name)); 497fcf89358SWaiman Long ret += scnprintf(kbuf + ret, count - ret, 498fcf89358SWaiman Long "Charged %sto %smemcg %s\n", 499fcf89358SWaiman Long PageMemcgKmem(page) ? "(via objcg) " : "", 500fcf89358SWaiman Long online ? "" : "offline ", 501fcf89358SWaiman Long name); 502fcf89358SWaiman Long out_unlock: 503fcf89358SWaiman Long rcu_read_unlock(); 504fcf89358SWaiman Long #endif /* CONFIG_MEMCG */ 505fcf89358SWaiman Long 506fcf89358SWaiman Long return ret; 507fcf89358SWaiman Long } 508fcf89358SWaiman Long 50948c96a36SJoonsoo Kim static ssize_t 51048c96a36SJoonsoo Kim print_page_owner(char __user *buf, size_t count, unsigned long pfn, 5119300d8dfSJoonsoo Kim struct page *page, struct page_owner *page_owner, 512f2ca0b55SJoonsoo Kim depot_stack_handle_t handle) 51348c96a36SJoonsoo Kim { 514af52bf6bSThomas Gleixner int ret, pageblock_mt, page_mt; 51548c96a36SJoonsoo Kim char *kbuf; 51648c96a36SJoonsoo Kim 517c8f61cfcSMiles Chen count = min_t(size_t, count, PAGE_SIZE); 51848c96a36SJoonsoo Kim kbuf = kmalloc(count, GFP_KERNEL); 51948c96a36SJoonsoo Kim if (!kbuf) 52048c96a36SJoonsoo Kim return -ENOMEM; 52148c96a36SJoonsoo Kim 5223ebc4397SWaiman Long ret = scnprintf(kbuf, count, 523b459f090SAudra Mitchell "Page allocated via order %u, mask %#x(%pGg), pid %d, tgid %d (%s), ts %llu ns\n", 5249300d8dfSJoonsoo Kim page_owner->order, page_owner->gfp_mask, 5259cc7e96aSLiam Mark &page_owner->gfp_mask, page_owner->pid, 526bf215eabSYixuan Cao page_owner->tgid, page_owner->comm, 527b459f090SAudra Mitchell page_owner->ts_nsec); 52848c96a36SJoonsoo Kim 52948c96a36SJoonsoo Kim /* Print information relevant to grouping pages by mobility */ 5300b423ca2SMel Gorman pageblock_mt = get_pageblock_migratetype(page); 53101c0bfe0SWei Yang page_mt = gfp_migratetype(page_owner->gfp_mask); 5323ebc4397SWaiman Long ret += scnprintf(kbuf + ret, count - ret, 533399fd496SKassey Li "PFN 0x%lx type %s Block %lu type %s Flags %pGp\n", 53448c96a36SJoonsoo Kim pfn, 53560f30350SVlastimil Babka migratetype_names[page_mt], 53648c96a36SJoonsoo Kim pfn >> pageblock_order, 53760f30350SVlastimil Babka migratetype_names[pageblock_mt], 53823efd080SMatthew Wilcox (Oracle) &page->flags); 53948c96a36SJoonsoo Kim 5400f68d45eSImran Khan ret += stack_depot_snprint(handle, kbuf + ret, count - ret, 0); 54148c96a36SJoonsoo Kim if (ret >= count) 54248c96a36SJoonsoo Kim goto err; 54348c96a36SJoonsoo Kim 5449300d8dfSJoonsoo Kim if (page_owner->last_migrate_reason != -1) { 5453ebc4397SWaiman Long ret += scnprintf(kbuf + ret, count - ret, 5467cd12b4aSVlastimil Babka "Page has been migrated, last migrate reason: %s\n", 5479300d8dfSJoonsoo Kim migrate_reason_names[page_owner->last_migrate_reason]); 5487cd12b4aSVlastimil Babka } 5497cd12b4aSVlastimil Babka 550fcf89358SWaiman Long ret = print_page_owner_memcg(kbuf, count, ret, page); 551fcf89358SWaiman Long 55248c96a36SJoonsoo Kim ret += snprintf(kbuf + ret, count - ret, "\n"); 55348c96a36SJoonsoo Kim if (ret >= count) 55448c96a36SJoonsoo Kim goto err; 55548c96a36SJoonsoo Kim 55648c96a36SJoonsoo Kim if (copy_to_user(buf, kbuf, ret)) 55748c96a36SJoonsoo Kim ret = -EFAULT; 55848c96a36SJoonsoo Kim 55948c96a36SJoonsoo Kim kfree(kbuf); 56048c96a36SJoonsoo Kim return ret; 56148c96a36SJoonsoo Kim 56248c96a36SJoonsoo Kim err: 56348c96a36SJoonsoo Kim kfree(kbuf); 56448c96a36SJoonsoo Kim return -ENOMEM; 56548c96a36SJoonsoo Kim } 56648c96a36SJoonsoo Kim 5678bf6f451SMatthew Wilcox (Oracle) void __dump_page_owner(const struct page *page) 5684e462112SVlastimil Babka { 569b1d5488aSCharan Teja Kalla struct page_ext *page_ext = page_ext_get((void *)page); 5709300d8dfSJoonsoo Kim struct page_owner *page_owner; 571f2ca0b55SJoonsoo Kim depot_stack_handle_t handle; 5728285027fSSudip Mukherjee gfp_t gfp_mask; 5738285027fSSudip Mukherjee int mt; 5744e462112SVlastimil Babka 575f86e4271SYang Shi if (unlikely(!page_ext)) { 576f86e4271SYang Shi pr_alert("There is not page extension available.\n"); 577f86e4271SYang Shi return; 578f86e4271SYang Shi } 5799300d8dfSJoonsoo Kim 5809300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 5819300d8dfSJoonsoo Kim gfp_mask = page_owner->gfp_mask; 58201c0bfe0SWei Yang mt = gfp_migratetype(gfp_mask); 583f86e4271SYang Shi 5844e462112SVlastimil Babka if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) { 58537389167SVlastimil Babka pr_alert("page_owner info is not present (never set?)\n"); 586b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 5874e462112SVlastimil Babka return; 5884e462112SVlastimil Babka } 5894e462112SVlastimil Babka 590fdf3bf80SVlastimil Babka if (test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags)) 59137389167SVlastimil Babka pr_alert("page_owner tracks the page as allocated\n"); 59237389167SVlastimil Babka else 59337389167SVlastimil Babka pr_alert("page_owner tracks the page as freed\n"); 59437389167SVlastimil Babka 595bf215eabSYixuan Cao pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg), pid %d, tgid %d (%s), ts %llu, free_ts %llu\n", 5969cc7e96aSLiam Mark page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask, 597bf215eabSYixuan Cao page_owner->pid, page_owner->tgid, page_owner->comm, 598bf215eabSYixuan Cao page_owner->ts_nsec, page_owner->free_ts_nsec); 59937389167SVlastimil Babka 6009300d8dfSJoonsoo Kim handle = READ_ONCE(page_owner->handle); 601505be481SImran Khan if (!handle) 60237389167SVlastimil Babka pr_alert("page_owner allocation stack trace missing\n"); 603505be481SImran Khan else 604505be481SImran Khan stack_depot_print(handle); 6054e462112SVlastimil Babka 6068974558fSVlastimil Babka handle = READ_ONCE(page_owner->free_handle); 6078974558fSVlastimil Babka if (!handle) { 6088974558fSVlastimil Babka pr_alert("page_owner free stack trace missing\n"); 6098974558fSVlastimil Babka } else { 6101b5c65b6SBarry Song pr_alert("page last free pid %d tgid %d stack trace:\n", 6111b5c65b6SBarry Song page_owner->free_pid, page_owner->free_tgid); 612505be481SImran Khan stack_depot_print(handle); 6138974558fSVlastimil Babka } 6148974558fSVlastimil Babka 6159300d8dfSJoonsoo Kim if (page_owner->last_migrate_reason != -1) 6164e462112SVlastimil Babka pr_alert("page has been migrated, last migrate reason: %s\n", 6179300d8dfSJoonsoo Kim migrate_reason_names[page_owner->last_migrate_reason]); 618b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 6194e462112SVlastimil Babka } 6204e462112SVlastimil Babka 62148c96a36SJoonsoo Kim static ssize_t 62248c96a36SJoonsoo Kim read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) 62348c96a36SJoonsoo Kim { 62448c96a36SJoonsoo Kim unsigned long pfn; 62548c96a36SJoonsoo Kim struct page *page; 62648c96a36SJoonsoo Kim struct page_ext *page_ext; 6279300d8dfSJoonsoo Kim struct page_owner *page_owner; 628f2ca0b55SJoonsoo Kim depot_stack_handle_t handle; 62948c96a36SJoonsoo Kim 6307dd80b8aSVlastimil Babka if (!static_branch_unlikely(&page_owner_inited)) 63148c96a36SJoonsoo Kim return -EINVAL; 63248c96a36SJoonsoo Kim 63348c96a36SJoonsoo Kim page = NULL; 6348f0efa81SKassey Li if (*ppos == 0) 6358f0efa81SKassey Li pfn = min_low_pfn; 6368f0efa81SKassey Li else 6378f0efa81SKassey Li pfn = *ppos; 63848c96a36SJoonsoo Kim /* Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area */ 63948c96a36SJoonsoo Kim while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) 64048c96a36SJoonsoo Kim pfn++; 64148c96a36SJoonsoo Kim 64248c96a36SJoonsoo Kim /* Find an allocated page */ 64348c96a36SJoonsoo Kim for (; pfn < max_pfn; pfn++) { 64448c96a36SJoonsoo Kim /* 645b1d5488aSCharan Teja Kalla * This temporary page_owner is required so 646b1d5488aSCharan Teja Kalla * that we can avoid the context switches while holding 647b1d5488aSCharan Teja Kalla * the rcu lock and copying the page owner information to 648b1d5488aSCharan Teja Kalla * user through copy_to_user() or GFP_KERNEL allocations. 649b1d5488aSCharan Teja Kalla */ 650b1d5488aSCharan Teja Kalla struct page_owner page_owner_tmp; 651b1d5488aSCharan Teja Kalla 652b1d5488aSCharan Teja Kalla /* 65348c96a36SJoonsoo Kim * If the new page is in a new MAX_ORDER_NR_PAGES area, 65448c96a36SJoonsoo Kim * validate the area as existing, skip it if not 65548c96a36SJoonsoo Kim */ 65648c96a36SJoonsoo Kim if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0 && !pfn_valid(pfn)) { 65748c96a36SJoonsoo Kim pfn += MAX_ORDER_NR_PAGES - 1; 65848c96a36SJoonsoo Kim continue; 65948c96a36SJoonsoo Kim } 66048c96a36SJoonsoo Kim 66148c96a36SJoonsoo Kim page = pfn_to_page(pfn); 66248c96a36SJoonsoo Kim if (PageBuddy(page)) { 663ab130f91SMatthew Wilcox (Oracle) unsigned long freepage_order = buddy_order_unsafe(page); 66448c96a36SJoonsoo Kim 6655e0a760bSKirill A. Shutemov if (freepage_order <= MAX_PAGE_ORDER) 66648c96a36SJoonsoo Kim pfn += (1UL << freepage_order) - 1; 66748c96a36SJoonsoo Kim continue; 66848c96a36SJoonsoo Kim } 66948c96a36SJoonsoo Kim 670b1d5488aSCharan Teja Kalla page_ext = page_ext_get(page); 671f86e4271SYang Shi if (unlikely(!page_ext)) 672f86e4271SYang Shi continue; 67348c96a36SJoonsoo Kim 67448c96a36SJoonsoo Kim /* 67561cf5febSJoonsoo Kim * Some pages could be missed by concurrent allocation or free, 67661cf5febSJoonsoo Kim * because we don't hold the zone lock. 67748c96a36SJoonsoo Kim */ 67848c96a36SJoonsoo Kim if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) 679b1d5488aSCharan Teja Kalla goto ext_put_continue; 68048c96a36SJoonsoo Kim 68137389167SVlastimil Babka /* 68237389167SVlastimil Babka * Although we do have the info about past allocation of free 68337389167SVlastimil Babka * pages, it's not relevant for current memory usage. 68437389167SVlastimil Babka */ 685fdf3bf80SVlastimil Babka if (!test_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags)) 686b1d5488aSCharan Teja Kalla goto ext_put_continue; 68737389167SVlastimil Babka 6889300d8dfSJoonsoo Kim page_owner = get_page_owner(page_ext); 6899300d8dfSJoonsoo Kim 690f2ca0b55SJoonsoo Kim /* 6917e2f2a0cSVlastimil Babka * Don't print "tail" pages of high-order allocations as that 6927e2f2a0cSVlastimil Babka * would inflate the stats. 6937e2f2a0cSVlastimil Babka */ 6947e2f2a0cSVlastimil Babka if (!IS_ALIGNED(pfn, 1 << page_owner->order)) 695b1d5488aSCharan Teja Kalla goto ext_put_continue; 6967e2f2a0cSVlastimil Babka 6977e2f2a0cSVlastimil Babka /* 698f2ca0b55SJoonsoo Kim * Access to page_ext->handle isn't synchronous so we should 699f2ca0b55SJoonsoo Kim * be careful to access it. 700f2ca0b55SJoonsoo Kim */ 7019300d8dfSJoonsoo Kim handle = READ_ONCE(page_owner->handle); 702f2ca0b55SJoonsoo Kim if (!handle) 703b1d5488aSCharan Teja Kalla goto ext_put_continue; 704f2ca0b55SJoonsoo Kim 70548c96a36SJoonsoo Kim /* Record the next PFN to read in the file offset */ 7068f0efa81SKassey Li *ppos = pfn + 1; 70748c96a36SJoonsoo Kim 708b1d5488aSCharan Teja Kalla page_owner_tmp = *page_owner; 709b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 710f2ca0b55SJoonsoo Kim return print_page_owner(buf, count, pfn, page, 711b1d5488aSCharan Teja Kalla &page_owner_tmp, handle); 712b1d5488aSCharan Teja Kalla ext_put_continue: 713b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 71448c96a36SJoonsoo Kim } 71548c96a36SJoonsoo Kim 71648c96a36SJoonsoo Kim return 0; 71748c96a36SJoonsoo Kim } 71848c96a36SJoonsoo Kim 7198f0efa81SKassey Li static loff_t lseek_page_owner(struct file *file, loff_t offset, int orig) 7208f0efa81SKassey Li { 7218f0efa81SKassey Li switch (orig) { 7228f0efa81SKassey Li case SEEK_SET: 7238f0efa81SKassey Li file->f_pos = offset; 7248f0efa81SKassey Li break; 7258f0efa81SKassey Li case SEEK_CUR: 7268f0efa81SKassey Li file->f_pos += offset; 7278f0efa81SKassey Li break; 7288f0efa81SKassey Li default: 7298f0efa81SKassey Li return -EINVAL; 7308f0efa81SKassey Li } 7318f0efa81SKassey Li return file->f_pos; 7328f0efa81SKassey Li } 7338f0efa81SKassey Li 73461cf5febSJoonsoo Kim static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) 73561cf5febSJoonsoo Kim { 7366787c1daSOscar Salvador unsigned long pfn = zone->zone_start_pfn; 7376787c1daSOscar Salvador unsigned long end_pfn = zone_end_pfn(zone); 73861cf5febSJoonsoo Kim unsigned long count = 0; 73961cf5febSJoonsoo Kim 74061cf5febSJoonsoo Kim /* 74161cf5febSJoonsoo Kim * Walk the zone in pageblock_nr_pages steps. If a page block spans 74261cf5febSJoonsoo Kim * a zone boundary, it will be double counted between zones. This does 74361cf5febSJoonsoo Kim * not matter as the mixed block count will still be correct 74461cf5febSJoonsoo Kim */ 74561cf5febSJoonsoo Kim for (; pfn < end_pfn; ) { 7466787c1daSOscar Salvador unsigned long block_end_pfn; 7476787c1daSOscar Salvador 74861cf5febSJoonsoo Kim if (!pfn_valid(pfn)) { 74961cf5febSJoonsoo Kim pfn = ALIGN(pfn + 1, MAX_ORDER_NR_PAGES); 75061cf5febSJoonsoo Kim continue; 75161cf5febSJoonsoo Kim } 75261cf5febSJoonsoo Kim 7534f9bc69aSKefeng Wang block_end_pfn = pageblock_end_pfn(pfn); 75461cf5febSJoonsoo Kim block_end_pfn = min(block_end_pfn, end_pfn); 75561cf5febSJoonsoo Kim 75661cf5febSJoonsoo Kim for (; pfn < block_end_pfn; pfn++) { 757859a85ddSMike Rapoport struct page *page = pfn_to_page(pfn); 7586787c1daSOscar Salvador struct page_ext *page_ext; 7596787c1daSOscar Salvador 7609d43f5aeSJoonsoo Kim if (page_zone(page) != zone) 7619d43f5aeSJoonsoo Kim continue; 7629d43f5aeSJoonsoo Kim 76361cf5febSJoonsoo Kim /* 76410903027SVlastimil Babka * To avoid having to grab zone->lock, be a little 76510903027SVlastimil Babka * careful when reading buddy page order. The only 76610903027SVlastimil Babka * danger is that we skip too much and potentially miss 76710903027SVlastimil Babka * some early allocated pages, which is better than 76810903027SVlastimil Babka * heavy lock contention. 76961cf5febSJoonsoo Kim */ 77061cf5febSJoonsoo Kim if (PageBuddy(page)) { 771ab130f91SMatthew Wilcox (Oracle) unsigned long order = buddy_order_unsafe(page); 77210903027SVlastimil Babka 7735e0a760bSKirill A. Shutemov if (order > 0 && order <= MAX_PAGE_ORDER) 77410903027SVlastimil Babka pfn += (1UL << order) - 1; 77561cf5febSJoonsoo Kim continue; 77661cf5febSJoonsoo Kim } 77761cf5febSJoonsoo Kim 77861cf5febSJoonsoo Kim if (PageReserved(page)) 77961cf5febSJoonsoo Kim continue; 78061cf5febSJoonsoo Kim 781b1d5488aSCharan Teja Kalla page_ext = page_ext_get(page); 782f86e4271SYang Shi if (unlikely(!page_ext)) 783f86e4271SYang Shi continue; 78461cf5febSJoonsoo Kim 785dab4ead1SVlastimil Babka /* Maybe overlapping zone */ 78661cf5febSJoonsoo Kim if (test_bit(PAGE_EXT_OWNER, &page_ext->flags)) 787b1d5488aSCharan Teja Kalla goto ext_put_continue; 78861cf5febSJoonsoo Kim 78961cf5febSJoonsoo Kim /* Found early allocated page */ 79064ea78d2Szhongjiang-ali __set_page_owner_handle(page_ext, early_handle, 7917e2f2a0cSVlastimil Babka 0, 0); 79261cf5febSJoonsoo Kim count++; 793b1d5488aSCharan Teja Kalla ext_put_continue: 794b1d5488aSCharan Teja Kalla page_ext_put(page_ext); 79561cf5febSJoonsoo Kim } 79610903027SVlastimil Babka cond_resched(); 79761cf5febSJoonsoo Kim } 79861cf5febSJoonsoo Kim 79961cf5febSJoonsoo Kim pr_info("Node %d, zone %8s: page owner found early allocated %lu pages\n", 80061cf5febSJoonsoo Kim pgdat->node_id, zone->name, count); 80161cf5febSJoonsoo Kim } 80261cf5febSJoonsoo Kim 80361cf5febSJoonsoo Kim static void init_zones_in_node(pg_data_t *pgdat) 80461cf5febSJoonsoo Kim { 80561cf5febSJoonsoo Kim struct zone *zone; 80661cf5febSJoonsoo Kim struct zone *node_zones = pgdat->node_zones; 80761cf5febSJoonsoo Kim 80861cf5febSJoonsoo Kim for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { 80961cf5febSJoonsoo Kim if (!populated_zone(zone)) 81061cf5febSJoonsoo Kim continue; 81161cf5febSJoonsoo Kim 81261cf5febSJoonsoo Kim init_pages_in_zone(pgdat, zone); 81361cf5febSJoonsoo Kim } 81461cf5febSJoonsoo Kim } 81561cf5febSJoonsoo Kim 81661cf5febSJoonsoo Kim static void init_early_allocated_pages(void) 81761cf5febSJoonsoo Kim { 81861cf5febSJoonsoo Kim pg_data_t *pgdat; 81961cf5febSJoonsoo Kim 82061cf5febSJoonsoo Kim for_each_online_pgdat(pgdat) 82161cf5febSJoonsoo Kim init_zones_in_node(pgdat); 82261cf5febSJoonsoo Kim } 82361cf5febSJoonsoo Kim 82448c96a36SJoonsoo Kim static const struct file_operations proc_page_owner_operations = { 82548c96a36SJoonsoo Kim .read = read_page_owner, 8268f0efa81SKassey Li .llseek = lseek_page_owner, 82748c96a36SJoonsoo Kim }; 82848c96a36SJoonsoo Kim 829765973a0SOscar Salvador static void *stack_start(struct seq_file *m, loff_t *ppos) 830765973a0SOscar Salvador { 831765973a0SOscar Salvador struct stack *stack; 832765973a0SOscar Salvador 833765973a0SOscar Salvador if (*ppos == -1UL) 834765973a0SOscar Salvador return NULL; 835765973a0SOscar Salvador 836765973a0SOscar Salvador if (!*ppos) { 837765973a0SOscar Salvador /* 838765973a0SOscar Salvador * This pairs with smp_store_release() from function 839765973a0SOscar Salvador * add_stack_record_to_list(), so we get a consistent 840765973a0SOscar Salvador * value of stack_list. 841765973a0SOscar Salvador */ 842765973a0SOscar Salvador stack = smp_load_acquire(&stack_list); 843765973a0SOscar Salvador } else { 844765973a0SOscar Salvador stack = m->private; 845765973a0SOscar Salvador stack = stack->next; 846765973a0SOscar Salvador } 847765973a0SOscar Salvador 848765973a0SOscar Salvador m->private = stack; 849765973a0SOscar Salvador 850765973a0SOscar Salvador return stack; 851765973a0SOscar Salvador } 852765973a0SOscar Salvador 853765973a0SOscar Salvador static void *stack_next(struct seq_file *m, void *v, loff_t *ppos) 854765973a0SOscar Salvador { 855765973a0SOscar Salvador struct stack *stack = v; 856765973a0SOscar Salvador 857765973a0SOscar Salvador stack = stack->next; 858765973a0SOscar Salvador *ppos = stack ? *ppos + 1 : -1UL; 859765973a0SOscar Salvador m->private = stack; 860765973a0SOscar Salvador 861765973a0SOscar Salvador return stack; 862765973a0SOscar Salvador } 863765973a0SOscar Salvador 86405bb6f4eSOscar Salvador static unsigned long page_owner_stack_threshold; 86505bb6f4eSOscar Salvador 866765973a0SOscar Salvador static int stack_print(struct seq_file *m, void *v) 867765973a0SOscar Salvador { 868765973a0SOscar Salvador int i, stack_count; 869765973a0SOscar Salvador struct stack *stack = v; 870765973a0SOscar Salvador unsigned long *entries; 871765973a0SOscar Salvador unsigned long nr_entries; 872765973a0SOscar Salvador struct stack_record *stack_record = stack->stack_record; 873765973a0SOscar Salvador 87484d6ac31SOscar Salvador if (!stack->stack_record) 87584d6ac31SOscar Salvador return 0; 87684d6ac31SOscar Salvador 877765973a0SOscar Salvador nr_entries = stack_record->size; 878765973a0SOscar Salvador entries = stack_record->entries; 879765973a0SOscar Salvador stack_count = refcount_read(&stack_record->count) - 1; 880765973a0SOscar Salvador 8814839e79cSOscar Salvador if (stack_count < 1 || stack_count < page_owner_stack_threshold) 882765973a0SOscar Salvador return 0; 883765973a0SOscar Salvador 884765973a0SOscar Salvador for (i = 0; i < nr_entries; i++) 885765973a0SOscar Salvador seq_printf(m, " %pS\n", (void *)entries[i]); 886765973a0SOscar Salvador seq_printf(m, "stack_count: %d\n\n", stack_count); 887765973a0SOscar Salvador 888765973a0SOscar Salvador return 0; 889765973a0SOscar Salvador } 890765973a0SOscar Salvador 891765973a0SOscar Salvador static void stack_stop(struct seq_file *m, void *v) 892765973a0SOscar Salvador { 893765973a0SOscar Salvador } 894765973a0SOscar Salvador 895765973a0SOscar Salvador static const struct seq_operations page_owner_stack_op = { 896765973a0SOscar Salvador .start = stack_start, 897765973a0SOscar Salvador .next = stack_next, 898765973a0SOscar Salvador .stop = stack_stop, 899765973a0SOscar Salvador .show = stack_print 900765973a0SOscar Salvador }; 901765973a0SOscar Salvador 902765973a0SOscar Salvador static int page_owner_stack_open(struct inode *inode, struct file *file) 903765973a0SOscar Salvador { 904765973a0SOscar Salvador return seq_open_private(file, &page_owner_stack_op, 0); 905765973a0SOscar Salvador } 906765973a0SOscar Salvador 907765973a0SOscar Salvador static const struct file_operations page_owner_stack_operations = { 908765973a0SOscar Salvador .open = page_owner_stack_open, 909765973a0SOscar Salvador .read = seq_read, 910765973a0SOscar Salvador .llseek = seq_lseek, 911765973a0SOscar Salvador .release = seq_release, 912765973a0SOscar Salvador }; 913765973a0SOscar Salvador 91405bb6f4eSOscar Salvador static int page_owner_threshold_get(void *data, u64 *val) 91505bb6f4eSOscar Salvador { 91605bb6f4eSOscar Salvador *val = READ_ONCE(page_owner_stack_threshold); 91705bb6f4eSOscar Salvador return 0; 91805bb6f4eSOscar Salvador } 91905bb6f4eSOscar Salvador 92005bb6f4eSOscar Salvador static int page_owner_threshold_set(void *data, u64 val) 92105bb6f4eSOscar Salvador { 92205bb6f4eSOscar Salvador WRITE_ONCE(page_owner_stack_threshold, val); 92305bb6f4eSOscar Salvador return 0; 92405bb6f4eSOscar Salvador } 92505bb6f4eSOscar Salvador 92605bb6f4eSOscar Salvador DEFINE_SIMPLE_ATTRIBUTE(proc_page_owner_threshold, &page_owner_threshold_get, 92705bb6f4eSOscar Salvador &page_owner_threshold_set, "%llu"); 92805bb6f4eSOscar Salvador 92905bb6f4eSOscar Salvador 93048c96a36SJoonsoo Kim static int __init pageowner_init(void) 93148c96a36SJoonsoo Kim { 932765973a0SOscar Salvador struct dentry *dir; 933765973a0SOscar Salvador 9347dd80b8aSVlastimil Babka if (!static_branch_unlikely(&page_owner_inited)) { 93548c96a36SJoonsoo Kim pr_info("page_owner is disabled\n"); 93648c96a36SJoonsoo Kim return 0; 93748c96a36SJoonsoo Kim } 93848c96a36SJoonsoo Kim 939d9f7979cSGreg Kroah-Hartman debugfs_create_file("page_owner", 0400, NULL, NULL, 940d9f7979cSGreg Kroah-Hartman &proc_page_owner_operations); 941765973a0SOscar Salvador dir = debugfs_create_dir("page_owner_stacks", NULL); 942765973a0SOscar Salvador debugfs_create_file("show_stacks", 0400, dir, NULL, 943765973a0SOscar Salvador &page_owner_stack_operations); 94405bb6f4eSOscar Salvador debugfs_create_file("count_threshold", 0600, dir, NULL, 94505bb6f4eSOscar Salvador &proc_page_owner_threshold); 94648c96a36SJoonsoo Kim 947d9f7979cSGreg Kroah-Hartman return 0; 94848c96a36SJoonsoo Kim } 94944c5af96SPaul Gortmaker late_initcall(pageowner_init) 950