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Merge tag 'sched-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull scheduler updates from Ingo Molnar:

 - Allow unprivileged PSI poll()ing

 - Fix performance regression introduced by mm_cid

 - Improve livepatch stalls by adding livepatch task switching to
   cond_resched(). This resolves livepatching busy-loop stalls with
   certain CPU-bound kthreads

 - Improve sched_move_task() performance on autogroup configs

 - On core-scheduling CPUs, avoid selecting throttled tasks to run

 - Misc cleanups, fixes and improvements

* tag 'sched-core-2023-04-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/clock: Fix local_clock() before sched_clock_init()
  sched/rt: Fix bad task migration for rt tasks
  sched: Fix performance regression introduced by mm_cid
  sched/core: Make sched_dynamic_mutex static
  sched/psi: Allow unprivileged polling of N*2s period
  sched/psi: Extract update_triggers side effect
  sched/psi: Rename existing poll members in preparation
  sched/psi: Rearrange polling code in preparation
  sched/fair: Fix inaccurate tally of ttwu_move_affine
  vhost: Fix livepatch timeouts in vhost_worker()
  livepatch,sched: Add livepatch task switching to cond_resched()
  livepatch: Skip task_call_func() for current task
  livepatch: Convert stack entries array to percpu
  sched: Interleave cfs bandwidth timers for improved single thread performance at low utilization
  sched/core: Reduce cost of sched_move_task when config autogroup
  sched/core: Avoid selecting the task that is throttled to run when core-sched enable
  sched/topology: Make sched_energy_mutex,update static
This commit is contained in:
Linus Torvalds
2023-04-28 14:53:30 -07:00
parent 7c339778f9 f31dcb152a
commit 586b222d74
21 changed files with 1430 additions and 356 deletions
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9
kernel/fork.c
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@@ -924,6 +924,7 @@ void __mmdrop(struct mm_struct *mm)
check_mm(mm);
put_user_ns(mm->user_ns);
mm_pasid_drop(mm);
mm_destroy_cid(mm);
for (i = 0; i < NR_MM_COUNTERS; i++)
percpu_counter_destroy(&mm->rss_stat[i]);
@@ -1188,7 +1189,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
#ifdef CONFIG_SCHED_MM_CID
tsk->mm_cid = -1;
tsk->last_mm_cid = -1;
tsk->mm_cid_active = 0;
tsk->migrate_from_cpu = -1;
#endif
return tsk;
@@ -1296,18 +1299,22 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
if (init_new_context(p, mm))
goto fail_nocontext;
if (mm_alloc_cid(mm))
goto fail_cid;
for (i = 0; i < NR_MM_COUNTERS; i++)
if (percpu_counter_init(&mm->rss_stat[i], 0, GFP_KERNEL_ACCOUNT))
goto fail_pcpu;
mm->user_ns = get_user_ns(user_ns);
lru_gen_init_mm(mm);
mm_init_cid(mm);
return mm;
fail_pcpu:
while (i > 0)
percpu_counter_destroy(&mm->rss_stat[--i]);
mm_destroy_cid(mm);
fail_cid:
destroy_context(mm);
fail_nocontext:
mm_free_pgd(mm);