Hi Lu, First bad commit (maybe != root cause): tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 58353f394bfe86212d5089bc9c1c235ffc761e2c commit: 654944510822988390470cbc5b6f914c19dd9b88 [2130/2130] sched/psi: add cpu fine grained stall tracking in pressure.stat config: arm64-randconfig-001-20250417 (https://download.01.org/0day-ci/archive/20250417/202504170110.nEONpqWt-lkp@i...) compiler: aarch64-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250417/202504170110.nEONpqWt-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202504170110.nEONpqWt-lkp@intel.com/ All warnings (new ones prefixed by >>): ^ include/linux/init.h:343:32: note: in definition of macro '__setup_param' = { __setup_str_##unique_id, fn, early } ^~ kernel/sched/autogroup.c:227:1: note: in expansion of macro '__setup' __setup("noautogroup", setup_autogroup); ^~~~~~~ kernel/sched/build_utility.c:110:0: error: expected declaration or statement at end of input #endif In file included from kernel/sched/build_utility.c:97:0: kernel/sched/build_utility.c: At top level: kernel/sched/psi.c:178:13: warning: 'psi_avgs_work' used but never defined static void psi_avgs_work(struct work_struct *work); ^~~~~~~~~~~~~ kernel/sched/psi.c:180:13: warning: 'poll_timer_fn' used but never defined static void poll_timer_fn(struct timer_list *t); ^~~~~~~~~~~~~ In file included from kernel/sched/build_utility.c:109:0: kernel/sched/autogroup.c:285:5: warning: 'autogroup_path' defined but not used [-Wunused-function] int autogroup_path(struct task_group *tg, char *buf, int buflen) ^~~~~~~~~~~~~~ kernel/sched/autogroup.c:269:6: warning: 'proc_sched_autogroup_show_task' defined but not used [-Wunused-function] void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:231:5: warning: 'proc_sched_autogroup_set_nice' defined but not used [-Wunused-function] int proc_sched_autogroup_set_nice(struct task_struct *p, int nice) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:216:6: warning: 'sched_autogroup_exit' defined but not used [-Wunused-function] void sched_autogroup_exit(struct signal_struct *sig) ^~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:211:6: warning: 'sched_autogroup_fork' defined but not used [-Wunused-function] void sched_autogroup_fork(struct signal_struct *sig) ^~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:147:6: warning: 'sched_autogroup_exit_task' defined but not used [-Wunused-function] void sched_autogroup_exit_task(struct task_struct *p) ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:129:6: warning: 'task_wants_autogroup' defined but not used [-Wunused-function] bool task_wants_autogroup(struct task_struct *p, struct task_group *tg) ^~~~~~~~~~~~~~~~~~~~ kernel/sched/autogroup.c:42:6: warning: 'autogroup_free' defined but not used [-Wunused-function] void autogroup_free(struct task_group *tg) ^~~~~~~~~~~~~~ kernel/sched/autogroup.c:33:13: warning: 'autogroup_init' defined but not used [-Wunused-function] void __init autogroup_init(struct task_struct *init_task) ^~~~~~~~~~~~~~ In file included from include/linux/compat.h:34:0, from arch/arm64/include/asm/elf.h:9, from include/linux/elf.h:6, from include/linux/module.h:19, from include/linux/device/driver.h:21, from include/linux/device.h:32, from include/linux/node.h:18, from include/linux/cpu.h:17, from include/linux/cpufreq.h:12, from kernel/sched/build_utility.c:22: arch/arm64/include/asm/syscall_wrapper.h:62:14: warning: '__se_sys_membarrier' defined but not used [-Wunused-function] static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ ^ include/linux/syscalls.h:230:2: note: in expansion of macro '__SYSCALL_DEFINEx' __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) ^~~~~~~~~~~~~~~~~ include/linux/syscalls.h:221:36: note: in expansion of macro 'SYSCALL_DEFINEx' #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__) ^~~~~~~~~~~~~~~ kernel/sched/membarrier.c:614:1: note: in expansion of macro 'SYSCALL_DEFINE3' SYSCALL_DEFINE3(membarrier, int, cmd, unsigned int, flags, int, cpu_id) ^~~~~~~~~~~~~~~ arch/arm64/include/asm/syscall_wrapper.h:58:18: warning: '__arm64_sys_membarrier' defined but not used [-Wunused-function] asmlinkage long __arm64_sys##name(const struct pt_regs *regs) \ ^ include/linux/syscalls.h:230:2: note: in expansion of macro '__SYSCALL_DEFINEx' __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) ^~~~~~~~~~~~~~~~~ include/linux/syscalls.h:221:36: note: in expansion of macro 'SYSCALL_DEFINEx' #define SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, _##name, __VA_ARGS__) ^~~~~~~~~~~~~~~ kernel/sched/membarrier.c:614:1: note: in expansion of macro 'SYSCALL_DEFINE3' SYSCALL_DEFINE3(membarrier, int, cmd, unsigned int, flags, int, cpu_id) ^~~~~~~~~~~~~~~ In file included from kernel/sched/build_utility.c:101:0: kernel/sched/membarrier.c:233:6: warning: 'membarrier_update_current_mm' defined but not used [-Wunused-function] void membarrier_update_current_mm(struct mm_struct *next_mm) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/membarrier.c:217:6: warning: 'membarrier_exec_mmap' defined but not used [-Wunused-function] void membarrier_exec_mmap(struct mm_struct *mm) ^~~~~~~~~~~~~~~~~~~~ In file included from kernel/sched/build_utility.c:97:0: kernel/sched/psi.c:1471:6: warning: 'psi_cgroup_restart' defined but not used [-Wunused-function] void psi_cgroup_restart(struct psi_group *group) ^~~~~~~~~~~~~~~~~~ kernel/sched/psi.c:1416:6: warning: 'cgroup_move_task' defined but not used [-Wunused-function] void cgroup_move_task(struct task_struct *task, struct css_set *to) ^~~~~~~~~~~~~~~~ kernel/sched/psi.c:1392:6: warning: 'psi_cgroup_free' defined but not used [-Wunused-function] void psi_cgroup_free(struct cgroup *cgroup) ^~~~~~~~~~~~~~~ kernel/sched/psi.c:1373:5: warning: 'psi_cgroup_alloc' defined but not used [-Wunused-function] int psi_cgroup_alloc(struct cgroup *cgroup) ^~~~~~~~~~~~~~~~

...

kernel/sched/psi.c:1262:6: warning: 'psi_account_irqtime' defined but not used [-Wunused-function] void psi_account_irqtime(struct task_struct *task, u32 delta) ^~~~~~~~~~~~~~~~~~~ kernel/sched/psi.c:1168:6: warning: 'psi_task_switch' defined but not used [-Wunused-function] void psi_task_switch(struct task_struct *prev, struct task_struct *next, ^~~~~~~~~~~~~~~ kernel/sched/psi.c:949:13: warning: 'poll_timer_fn' defined but not used [-Wunused-function] static void poll_timer_fn(struct timer_list *t) ^~~~~~~~~~~~~ cc1: some warnings being treated as errors

vim +/psi_account_irqtime +1262 kernel/sched/psi.c eb414681d5a07d Johannes Weiner 2018-10-26 1260 52b1364ba0b105 Chengming Zhou 2022-08-26 1261 #ifdef CONFIG_IRQ_TIME_ACCOUNTING 52b1364ba0b105 Chengming Zhou 2022-08-26 @1262 void psi_account_irqtime(struct task_struct *task, u32 delta) 52b1364ba0b105 Chengming Zhou 2022-08-26 1263 { 52b1364ba0b105 Chengming Zhou 2022-08-26 1264 int cpu = task_cpu(task); 52b1364ba0b105 Chengming Zhou 2022-08-26 1265 struct psi_group *group; 52b1364ba0b105 Chengming Zhou 2022-08-26 1266 struct psi_group_cpu *groupc; 52b1364ba0b105 Chengming Zhou 2022-08-26 1267 u64 now; 52b1364ba0b105 Chengming Zhou 2022-08-26 1268 c4069ab39e78c5 Haifeng Xu 2024-01-04 1269 if (static_branch_likely(&psi_disabled)) c4069ab39e78c5 Haifeng Xu 2024-01-04 1270 return; c4069ab39e78c5 Haifeng Xu 2024-01-04 1271 52b1364ba0b105 Chengming Zhou 2022-08-26 1272 if (!task->pid) 52b1364ba0b105 Chengming Zhou 2022-08-26 1273 return; 52b1364ba0b105 Chengming Zhou 2022-08-26 1274 52b1364ba0b105 Chengming Zhou 2022-08-26 1275 now = cpu_clock(cpu); 52b1364ba0b105 Chengming Zhou 2022-08-26 1276 dc86aba751e286 Chengming Zhou 2022-08-26 1277 group = task_psi_group(task); dc86aba751e286 Chengming Zhou 2022-08-26 1278 do { 34f26a15611afb Chengming Zhou 2022-09-07 1279 if (!group->enabled) 34f26a15611afb Chengming Zhou 2022-09-07 1280 continue; 34f26a15611afb Chengming Zhou 2022-09-07 1281 52b1364ba0b105 Chengming Zhou 2022-08-26 1282 groupc = per_cpu_ptr(group->pcpu, cpu); 52b1364ba0b105 Chengming Zhou 2022-08-26 1283 52b1364ba0b105 Chengming Zhou 2022-08-26 1284 write_seqcount_begin(&groupc->seq); 52b1364ba0b105 Chengming Zhou 2022-08-26 1285 52b1364ba0b105 Chengming Zhou 2022-08-26 1286 record_times(groupc, now); 52b1364ba0b105 Chengming Zhou 2022-08-26 1287 groupc->times[PSI_IRQ_FULL] += delta; 52b1364ba0b105 Chengming Zhou 2022-08-26 1288 52b1364ba0b105 Chengming Zhou 2022-08-26 1289 write_seqcount_end(&groupc->seq); 52b1364ba0b105 Chengming Zhou 2022-08-26 1290 65457b74aa9437 Domenico Cerasuolo 2023-03-30 1291 if (group->rtpoll_states & (1 << PSI_IRQ_FULL)) 65457b74aa9437 Domenico Cerasuolo 2023-03-30 1292 psi_schedule_rtpoll_work(group, 1, false); dc86aba751e286 Chengming Zhou 2022-08-26 1293 } while ((group = group->parent)); 52b1364ba0b105 Chengming Zhou 2022-08-26 1294 } 52b1364ba0b105 Chengming Zhou 2022-08-26 1295 #endif 52b1364ba0b105 Chengming Zhou 2022-08-26 1296 eb414681d5a07d Johannes Weiner 2018-10-26 1297 /** eb414681d5a07d Johannes Weiner 2018-10-26 1298 * psi_memstall_enter - mark the beginning of a memory stall section a65983d90bfb5e Lu Jialin 2024-01-04 1299 * @flags: flags to handle nested sections. When the memory pressure a65983d90bfb5e Lu Jialin 2024-01-04 1300 * is stalled in pressure_stat, the flags will be the pressure source, a65983d90bfb5e Lu Jialin 2024-01-04 1301 * Otherwise, the init flags should be zero. eb414681d5a07d Johannes Weiner 2018-10-26 1302 * eb414681d5a07d Johannes Weiner 2018-10-26 1303 * Marks the calling task as being stalled due to a lack of memory, eb414681d5a07d Johannes Weiner 2018-10-26 1304 * such as waiting for a refault or performing reclaim. eb414681d5a07d Johannes Weiner 2018-10-26 1305 */ eb414681d5a07d Johannes Weiner 2018-10-26 1306 void psi_memstall_enter(unsigned long *flags) eb414681d5a07d Johannes Weiner 2018-10-26 1307 { eb414681d5a07d Johannes Weiner 2018-10-26 1308 struct rq_flags rf; eb414681d5a07d Johannes Weiner 2018-10-26 1309 struct rq *rq; a65983d90bfb5e Lu Jialin 2024-01-04 1310 #ifdef CONFIG_PSI_FINE_GRAINED a65983d90bfb5e Lu Jialin 2024-01-04 1311 unsigned long stat_flags = *flags; a65983d90bfb5e Lu Jialin 2024-01-04 1312 #endif eb414681d5a07d Johannes Weiner 2018-10-26 1313 e0c274472d5d27 Johannes Weiner 2018-11-30 1314 if (static_branch_likely(&psi_disabled)) eb414681d5a07d Johannes Weiner 2018-10-26 1315 return; eb414681d5a07d Johannes Weiner 2018-10-26 1316 1066d1b6974e09 Yafang Shao 2020-03-16 1317 *flags = current->in_memstall; eb414681d5a07d Johannes Weiner 2018-10-26 1318 if (*flags) eb414681d5a07d Johannes Weiner 2018-10-26 1319 return; 3dfdd2f9d0dbe7 Lu Jialin 2024-01-02 1320 3dfdd2f9d0dbe7 Lu Jialin 2024-01-02 1321 trace_psi_memstall_enter(_RET_IP_); eb414681d5a07d Johannes Weiner 2018-10-26 1322 /* 1066d1b6974e09 Yafang Shao 2020-03-16 1323 * in_memstall setting & accounting needs to be atomic wrt eb414681d5a07d Johannes Weiner 2018-10-26 1324 * changes to the task's scheduling state, otherwise we can eb414681d5a07d Johannes Weiner 2018-10-26 1325 * race with CPU migration. eb414681d5a07d Johannes Weiner 2018-10-26 1326 */ eb414681d5a07d Johannes Weiner 2018-10-26 1327 rq = this_rq_lock_irq(&rf); eb414681d5a07d Johannes Weiner 2018-10-26 1328 1066d1b6974e09 Yafang Shao 2020-03-16 1329 current->in_memstall = 1; a65983d90bfb5e Lu Jialin 2024-01-04 1330 #ifdef CONFIG_PSI_FINE_GRAINED a65983d90bfb5e Lu Jialin 2024-01-04 1331 if (stat_flags) a65983d90bfb5e Lu Jialin 2024-01-04 1332 current->memstall_type = stat_flags; a65983d90bfb5e Lu Jialin 2024-01-04 1333 #endif cb0e52b7748737 Brian Chen 2021-11-10 1334 psi_task_change(current, 0, TSK_MEMSTALL | TSK_MEMSTALL_RUNNING); eb414681d5a07d Johannes Weiner 2018-10-26 1335 eb414681d5a07d Johannes Weiner 2018-10-26 1336 rq_unlock_irq(rq, &rf); eb414681d5a07d Johannes Weiner 2018-10-26 1337 } 527eb453bbfe65 Christoph Hellwig 2022-09-15 1338 EXPORT_SYMBOL_GPL(psi_memstall_enter); eb414681d5a07d Johannes Weiner 2018-10-26 1339 eb414681d5a07d Johannes Weiner 2018-10-26 1340 /** eb414681d5a07d Johannes Weiner 2018-10-26 1341 * psi_memstall_leave - mark the end of an memory stall section eb414681d5a07d Johannes Weiner 2018-10-26 1342 * @flags: flags to handle nested memdelay sections eb414681d5a07d Johannes Weiner 2018-10-26 1343 * eb414681d5a07d Johannes Weiner 2018-10-26 1344 * Marks the calling task as no longer stalled due to lack of memory. eb414681d5a07d Johannes Weiner 2018-10-26 1345 */ eb414681d5a07d Johannes Weiner 2018-10-26 1346 void psi_memstall_leave(unsigned long *flags) eb414681d5a07d Johannes Weiner 2018-10-26 1347 { eb414681d5a07d Johannes Weiner 2018-10-26 1348 struct rq_flags rf; eb414681d5a07d Johannes Weiner 2018-10-26 1349 struct rq *rq; eb414681d5a07d Johannes Weiner 2018-10-26 1350 e0c274472d5d27 Johannes Weiner 2018-11-30 1351 if (static_branch_likely(&psi_disabled)) eb414681d5a07d Johannes Weiner 2018-10-26 1352 return; eb414681d5a07d Johannes Weiner 2018-10-26 1353 eb414681d5a07d Johannes Weiner 2018-10-26 1354 if (*flags) eb414681d5a07d Johannes Weiner 2018-10-26 1355 return; 3dfdd2f9d0dbe7 Lu Jialin 2024-01-02 1356 3dfdd2f9d0dbe7 Lu Jialin 2024-01-02 1357 trace_psi_memstall_leave(_RET_IP_); eb414681d5a07d Johannes Weiner 2018-10-26 1358 /* 1066d1b6974e09 Yafang Shao 2020-03-16 1359 * in_memstall clearing & accounting needs to be atomic wrt eb414681d5a07d Johannes Weiner 2018-10-26 1360 * changes to the task's scheduling state, otherwise we could eb414681d5a07d Johannes Weiner 2018-10-26 1361 * race with CPU migration. eb414681d5a07d Johannes Weiner 2018-10-26 1362 */ eb414681d5a07d Johannes Weiner 2018-10-26 1363 rq = this_rq_lock_irq(&rf); eb414681d5a07d Johannes Weiner 2018-10-26 1364 1066d1b6974e09 Yafang Shao 2020-03-16 1365 current->in_memstall = 0; cb0e52b7748737 Brian Chen 2021-11-10 1366 psi_task_change(current, TSK_MEMSTALL | TSK_MEMSTALL_RUNNING, 0); eb414681d5a07d Johannes Weiner 2018-10-26 1367 eb414681d5a07d Johannes Weiner 2018-10-26 1368 rq_unlock_irq(rq, &rf); eb414681d5a07d Johannes Weiner 2018-10-26 1369 } 527eb453bbfe65 Christoph Hellwig 2022-09-15 1370 EXPORT_SYMBOL_GPL(psi_memstall_leave); eb414681d5a07d Johannes Weiner 2018-10-26 1371 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1372 #ifdef CONFIG_CGROUPS 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1373 int psi_cgroup_alloc(struct cgroup *cgroup) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1374 { e2ad8ab04c5cdf Chengming Zhou 2022-08-26 1375 if (!static_branch_likely(&psi_cgroups_enabled)) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1376 return 0; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1377 2b97cf76289a4f Hao Jia 2022-08-06 1378 cgroup->psi = kzalloc(sizeof(struct psi_group), GFP_KERNEL); 5f69a6577bc33d Chen Wandun 2022-05-26 1379 if (!cgroup->psi) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1380 return -ENOMEM; 5f69a6577bc33d Chen Wandun 2022-05-26 1381 5f69a6577bc33d Chen Wandun 2022-05-26 1382 cgroup->psi->pcpu = alloc_percpu(struct psi_group_cpu); 5f69a6577bc33d Chen Wandun 2022-05-26 1383 if (!cgroup->psi->pcpu) { 5f69a6577bc33d Chen Wandun 2022-05-26 1384 kfree(cgroup->psi); 5f69a6577bc33d Chen Wandun 2022-05-26 1385 return -ENOMEM; 5f69a6577bc33d Chen Wandun 2022-05-26 1386 } 5f69a6577bc33d Chen Wandun 2022-05-26 1387 group_init(cgroup->psi); dc86aba751e286 Chengming Zhou 2022-08-26 1388 cgroup->psi->parent = cgroup_psi(cgroup_parent(cgroup)); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1389 return 0; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1390 } 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1391 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1392 void psi_cgroup_free(struct cgroup *cgroup) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1393 { e2ad8ab04c5cdf Chengming Zhou 2022-08-26 1394 if (!static_branch_likely(&psi_cgroups_enabled)) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1395 return; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1396 5f69a6577bc33d Chen Wandun 2022-05-26 1397 cancel_delayed_work_sync(&cgroup->psi->avgs_work); 5f69a6577bc33d Chen Wandun 2022-05-26 1398 free_percpu(cgroup->psi->pcpu); 0e94682b73bfa6 Suren Baghdasaryan 2019-05-14 1399 /* All triggers must be removed by now */ 65457b74aa9437 Domenico Cerasuolo 2023-03-30 1400 WARN_ONCE(cgroup->psi->rtpoll_states, "psi: trigger leak\n"); 5f69a6577bc33d Chen Wandun 2022-05-26 1401 kfree(cgroup->psi); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1402 } 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1403 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1404 /** 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1405 * cgroup_move_task - move task to a different cgroup 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1406 * @task: the task 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1407 * @to: the target css_set 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1408 * 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1409 * Move task to a new cgroup and safely migrate its associated stall 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1410 * state between the different groups. 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1411 * 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1412 * This function acquires the task's rq lock to lock out concurrent 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1413 * changes to the task's scheduling state and - in case the task is 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1414 * running - concurrent changes to its stall state. 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1415 */ 2ce7135adc9ad0 Johannes Weiner 2018-10-26 @1416 void cgroup_move_task(struct task_struct *task, struct css_set *to) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1417 { d583d360a620e6 Johannes Weiner 2021-05-03 1418 unsigned int task_flags; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1419 struct rq_flags rf; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1420 struct rq *rq; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1421 e2ad8ab04c5cdf Chengming Zhou 2022-08-26 1422 if (!static_branch_likely(&psi_cgroups_enabled)) { 8fcb2312d1e330 Olof Johansson 2018-11-16 1423 /* 8fcb2312d1e330 Olof Johansson 2018-11-16 1424 * Lame to do this here, but the scheduler cannot be locked 8fcb2312d1e330 Olof Johansson 2018-11-16 1425 * from the outside, so we move cgroups from inside sched/. 8fcb2312d1e330 Olof Johansson 2018-11-16 1426 */ 8fcb2312d1e330 Olof Johansson 2018-11-16 1427 rcu_assign_pointer(task->cgroups, to); 8fcb2312d1e330 Olof Johansson 2018-11-16 1428 return; 8fcb2312d1e330 Olof Johansson 2018-11-16 1429 } 8fcb2312d1e330 Olof Johansson 2018-11-16 1430 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1431 rq = task_rq_lock(task, &rf); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1432 d583d360a620e6 Johannes Weiner 2021-05-03 1433 /* d583d360a620e6 Johannes Weiner 2021-05-03 1434 * We may race with schedule() dropping the rq lock between d583d360a620e6 Johannes Weiner 2021-05-03 1435 * deactivating prev and switching to next. Because the psi d583d360a620e6 Johannes Weiner 2021-05-03 1436 * updates from the deactivation are deferred to the switch d583d360a620e6 Johannes Weiner 2021-05-03 1437 * callback to save cgroup tree updates, the task's scheduling d583d360a620e6 Johannes Weiner 2021-05-03 1438 * state here is not coherent with its psi state: d583d360a620e6 Johannes Weiner 2021-05-03 1439 * d583d360a620e6 Johannes Weiner 2021-05-03 1440 * schedule() cgroup_move_task() d583d360a620e6 Johannes Weiner 2021-05-03 1441 * rq_lock() d583d360a620e6 Johannes Weiner 2021-05-03 1442 * deactivate_task() d583d360a620e6 Johannes Weiner 2021-05-03 1443 * p->on_rq = 0 d583d360a620e6 Johannes Weiner 2021-05-03 1444 * psi_dequeue() // defers TSK_RUNNING & TSK_IOWAIT updates d583d360a620e6 Johannes Weiner 2021-05-03 1445 * pick_next_task() d583d360a620e6 Johannes Weiner 2021-05-03 1446 * rq_unlock() d583d360a620e6 Johannes Weiner 2021-05-03 1447 * rq_lock() d583d360a620e6 Johannes Weiner 2021-05-03 1448 * psi_task_change() // old cgroup d583d360a620e6 Johannes Weiner 2021-05-03 1449 * task->cgroups = to d583d360a620e6 Johannes Weiner 2021-05-03 1450 * psi_task_change() // new cgroup d583d360a620e6 Johannes Weiner 2021-05-03 1451 * rq_unlock() d583d360a620e6 Johannes Weiner 2021-05-03 1452 * rq_lock() d583d360a620e6 Johannes Weiner 2021-05-03 1453 * psi_sched_switch() // does deferred updates in new cgroup d583d360a620e6 Johannes Weiner 2021-05-03 1454 * d583d360a620e6 Johannes Weiner 2021-05-03 1455 * Don't rely on the scheduling state. Use psi_flags instead. d583d360a620e6 Johannes Weiner 2021-05-03 1456 */ d583d360a620e6 Johannes Weiner 2021-05-03 1457 task_flags = task->psi_flags; 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1458 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1459 if (task_flags) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1460 psi_task_change(task, task_flags, 0); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1461 8fcb2312d1e330 Olof Johansson 2018-11-16 1462 /* See comment above */ 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1463 rcu_assign_pointer(task->cgroups, to); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1464 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1465 if (task_flags) 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1466 psi_task_change(task, 0, task_flags); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1467 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1468 task_rq_unlock(rq, task, &rf); 2ce7135adc9ad0 Johannes Weiner 2018-10-26 1469 } 34f26a15611afb Chengming Zhou 2022-09-07 1470 :::::: The code at line 1262 was first introduced by commit :::::: 52b1364ba0b105122d6de0e719b36db705011ac1 sched/psi: Add PSI_IRQ to track IRQ/SOFTIRQ pressure :::::: TO: Chengming Zhou <zhouchengming@bytedance.com> :::::: CC: Peter Zijlstra <peterz@infradead.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki