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Date: Thu, 26 May 2022 18:25:03 +0800
From: Chengming Zhou <zhouchengming@...edance.com>
To: kernel test robot <lkp@...el.com>, mingo@...hat.com,
peterz@...radead.org, juri.lelli@...hat.com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
bristot@...hat.com, vschneid@...hat.com, odin@...d.al
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
duanxiongchun@...edance.com, songmuchun@...edance.com
Subject: Re: [External] Re: [PATCH v2 2/2] sched/fair: optimize and simplify
rq leaf_cfs_rq_list
On 2022/5/26 16:53, kernel test robot wrote:
> Hi Chengming,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on tip/sched/core]
> [also build test ERROR on tip/master linus/master v5.18 next-20220525]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Chengming-Zhou/sched-fair-optimize-and-simplify-rq-leaf_cfs_rq_list/20220526-151850
> base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 991d8d8142cad94f9c5c05db25e67fa83d6f772a
> config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20220526/202205261617.YUT1ixQ8-lkp@intel.com/config)
> compiler: powerpc-linux-gcc (GCC) 11.3.0
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # https://github.com/intel-lab-lkp/linux/commit/cb2b1810aeb3f8f290a932f3e625ab9df1110054
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Chengming-Zhou/sched-fair-optimize-and-simplify-rq-leaf_cfs_rq_list/20220526-151850
> git checkout cb2b1810aeb3f8f290a932f3e625ab9df1110054
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash kernel/sched/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
Thanks, will fix !CONFIG_FAIR_GROUP_SCHED build next version.
>
> All errors (new ones prefixed by >>):
>
> kernel/sched/fair.c:645:5: warning: no previous prototype for 'sched_update_scaling' [-Wmissing-prototypes]
> 645 | int sched_update_scaling(void)
> | ^~~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c: In function 'enqueue_entity':
>>> kernel/sched/fair.c:4343:22: error: implicit declaration of function 'throttled_hierarchy' [-Werror=implicit-function-declaration]
> 4343 | if (!throttled_hierarchy(cfs_rq))
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c: At top level:
>>> kernel/sched/fair.c:5484:19: error: static declaration of 'throttled_hierarchy' follows non-static declaration
> 5484 | static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:4343:22: note: previous implicit declaration of 'throttled_hierarchy' with type 'int()'
> 4343 | if (!throttled_hierarchy(cfs_rq))
> | ^~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:5495:6: warning: no previous prototype for 'init_cfs_bandwidth' [-Wmissing-prototypes]
> 5495 | void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
> | ^~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:11654:6: warning: no previous prototype for 'free_fair_sched_group' [-Wmissing-prototypes]
> 11654 | void free_fair_sched_group(struct task_group *tg) { }
> | ^~~~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:11656:5: warning: no previous prototype for 'alloc_fair_sched_group' [-Wmissing-prototypes]
> 11656 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
> | ^~~~~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:11661:6: warning: no previous prototype for 'online_fair_sched_group' [-Wmissing-prototypes]
> 11661 | void online_fair_sched_group(struct task_group *tg) { }
> | ^~~~~~~~~~~~~~~~~~~~~~~
> kernel/sched/fair.c:11663:6: warning: no previous prototype for 'unregister_fair_sched_group' [-Wmissing-prototypes]
> 11663 | void unregister_fair_sched_group(struct task_group *tg) { }
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
>
>
> vim +/throttled_hierarchy +4343 kernel/sched/fair.c
>
> 4263
> 4264 /*
> 4265 * MIGRATION
> 4266 *
> 4267 * dequeue
> 4268 * update_curr()
> 4269 * update_min_vruntime()
> 4270 * vruntime -= min_vruntime
> 4271 *
> 4272 * enqueue
> 4273 * update_curr()
> 4274 * update_min_vruntime()
> 4275 * vruntime += min_vruntime
> 4276 *
> 4277 * this way the vruntime transition between RQs is done when both
> 4278 * min_vruntime are up-to-date.
> 4279 *
> 4280 * WAKEUP (remote)
> 4281 *
> 4282 * ->migrate_task_rq_fair() (p->state == TASK_WAKING)
> 4283 * vruntime -= min_vruntime
> 4284 *
> 4285 * enqueue
> 4286 * update_curr()
> 4287 * update_min_vruntime()
> 4288 * vruntime += min_vruntime
> 4289 *
> 4290 * this way we don't have the most up-to-date min_vruntime on the originating
> 4291 * CPU and an up-to-date min_vruntime on the destination CPU.
> 4292 */
> 4293
> 4294 static void
> 4295 enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
> 4296 {
> 4297 bool renorm = !(flags & ENQUEUE_WAKEUP) || (flags & ENQUEUE_MIGRATED);
> 4298 bool curr = cfs_rq->curr == se;
> 4299
> 4300 /*
> 4301 * If we're the current task, we must renormalise before calling
> 4302 * update_curr().
> 4303 */
> 4304 if (renorm && curr)
> 4305 se->vruntime += cfs_rq->min_vruntime;
> 4306
> 4307 update_curr(cfs_rq);
> 4308
> 4309 /*
> 4310 * Otherwise, renormalise after, such that we're placed at the current
> 4311 * moment in time, instead of some random moment in the past. Being
> 4312 * placed in the past could significantly boost this task to the
> 4313 * fairness detriment of existing tasks.
> 4314 */
> 4315 if (renorm && !curr)
> 4316 se->vruntime += cfs_rq->min_vruntime;
> 4317
> 4318 /*
> 4319 * When enqueuing a sched_entity, we must:
> 4320 * - Update loads to have both entity and cfs_rq synced with now.
> 4321 * - Add its load to cfs_rq->runnable_avg
> 4322 * - For group_entity, update its weight to reflect the new share of
> 4323 * its group cfs_rq
> 4324 * - Add its new weight to cfs_rq->load.weight
> 4325 */
> 4326 update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH);
> 4327 se_update_runnable(se);
> 4328 update_cfs_group(se);
> 4329 account_entity_enqueue(cfs_rq, se);
> 4330
> 4331 if (flags & ENQUEUE_WAKEUP)
> 4332 place_entity(cfs_rq, se, 0);
> 4333
> 4334 check_schedstat_required();
> 4335 update_stats_enqueue_fair(cfs_rq, se, flags);
> 4336 check_spread(cfs_rq, se);
> 4337 if (!curr)
> 4338 __enqueue_entity(cfs_rq, se);
> 4339 se->on_rq = 1;
> 4340
> 4341 if (cfs_rq->nr_running == 1) {
> 4342 check_enqueue_throttle(cfs_rq);
>> 4343 if (!throttled_hierarchy(cfs_rq))
> 4344 list_add_leaf_cfs_rq(cfs_rq);
> 4345 }
> 4346 }
> 4347
>
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