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Scheduler changes in this cycle were:

Browse source 
- Updates to scheduler metrics:
 
     - PELT fixes & enhancements
     - PSI fixes & enhancements
     - Refactor cpu_util_without()
 
  - Updates to instrumentation/debugging:
 
     - Remove sched_trace_*() helper functions - can be done via debug info
     - Fix double update_rq_clock() warnings
 
  - Introduce & use "preemption model accessors" to simplify some of
    the Kconfig complexity.
 
  - Make softirq handling RT-safe.
 
  - Misc smaller fixes & cleanups.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:

 - Updates to scheduler metrics:
     - PELT fixes & enhancements
     - PSI fixes & enhancements
     - Refactor cpu_util_without()

 - Updates to instrumentation/debugging:
     - Remove sched_trace_*() helper functions - can be done via debug
       info
     - Fix double update_rq_clock() warnings

 - Introduce & use "preemption model accessors" to simplify some of the
   Kconfig complexity.

 - Make softirq handling RT-safe.

 - Misc smaller fixes & cleanups.

* tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  topology: Remove unused cpu_cluster_mask()
  sched: Reverse sched_class layout
  sched/deadline: Remove superfluous rq clock update in push_dl_task()
  sched/core: Avoid obvious double update_rq_clock warning
  smp: Make softirq handling RT safe in flush_smp_call_function_queue()
  smp: Rename flush_smp_call_function_from_idle()
  sched: Fix missing prototype warnings
  sched/fair: Remove cfs_rq_tg_path()
  sched/fair: Remove sched_trace_*() helper functions
  sched/fair: Refactor cpu_util_without()
  sched/fair: Revise comment about lb decision matrix
  sched/psi: report zeroes for CPU full at the system level
  sched/fair: Delete useless condition in tg_unthrottle_up()
  sched/fair: Fix cfs_rq_clock_pelt() for throttled cfs_rq
  sched/fair: Move calculate of avg_load to a better location
  mailmap: Update my email address to @redhat.com
  MAINTAINERS: Add myself as scheduler topology reviewer
  psi: Fix trigger being fired unexpectedly at initial
  ftrace: Use preemption model accessors for trace header printout
  kcsan: Use preemption model accessors
This commit is contained in:
Linus Torvalds 2022-05-24 11:11:13 -07:00
commit 6f3f04c190
23 changed files with 219 additions and 337 deletions
Download patch file Download diff file Expand all files Collapse all files

32
kernel/smp.c
View file

@ -96,7 +96,7 @@ static DEFINE_PER_CPU_ALIGNED(struct call_function_data, cfd_data);
static DEFINE_PER_CPU_SHARED_ALIGNED(struct llist_head, call_single_queue);
static void flush_smp_call_function_queue(bool warn_cpu_offline);
static void __flush_smp_call_function_queue(bool warn_cpu_offline);
int smpcfd_prepare_cpu(unsigned int cpu)
{
@ -141,7 +141,7 @@ int smpcfd_dying_cpu(unsigned int cpu)
* ensure that the outgoing CPU doesn't go offline with work
* still pending.
*/
flush_smp_call_function_queue(false);
__flush_smp_call_function_queue(false);
irq_work_run();
return 0;
}
@ -544,11 +544,11 @@ void generic_smp_call_function_single_interrupt(void)
{
cfd_seq_store(this_cpu_ptr(&cfd_seq_local)->gotipi, CFD_SEQ_NOCPU,
smp_processor_id(), CFD_SEQ_GOTIPI);
flush_smp_call_function_queue(true);
__flush_smp_call_function_queue(true);
}
/**
* flush_smp_call_function_queue - Flush pending smp-call-function callbacks
* __flush_smp_call_function_queue - Flush pending smp-call-function callbacks
*
* @warn_cpu_offline: If set to 'true', warn if callbacks were queued on an
* offline CPU. Skip this check if set to 'false'.
@ -561,7 +561,7 @@ void generic_smp_call_function_single_interrupt(void)
* Loop through the call_single_queue and run all the queued callbacks.
* Must be called with interrupts disabled.
*/
static void flush_smp_call_function_queue(bool warn_cpu_offline)
static void __flush_smp_call_function_queue(bool warn_cpu_offline)
{
call_single_data_t *csd, *csd_next;
struct llist_node *entry, *prev;
@ -684,8 +684,22 @@ static void flush_smp_call_function_queue(bool warn_cpu_offline)
smp_processor_id(), CFD_SEQ_HDLEND);
}
void flush_smp_call_function_from_idle(void)
/**
* flush_smp_call_function_queue - Flush pending smp-call-function callbacks
* from task context (idle, migration thread)
*
* When TIF_POLLING_NRFLAG is supported and a CPU is in idle and has it
* set, then remote CPUs can avoid sending IPIs and wake the idle CPU by
* setting TIF_NEED_RESCHED. The idle task on the woken up CPU has to
* handle queued SMP function calls before scheduling.
*
* The migration thread has to ensure that an eventually pending wakeup has
* been handled before it migrates a task.
*/
void flush_smp_call_function_queue(void)
{
unsigned int was_pending;
unsigned long flags;
if (llist_empty(this_cpu_ptr(&call_single_queue)))
@ -694,9 +708,11 @@ void flush_smp_call_function_from_idle(void)
cfd_seq_store(this_cpu_ptr(&cfd_seq_local)->idle, CFD_SEQ_NOCPU,
smp_processor_id(), CFD_SEQ_IDLE);
local_irq_save(flags);
flush_smp_call_function_queue(true);
/* Get the already pending soft interrupts for RT enabled kernels */
was_pending = local_softirq_pending();
__flush_smp_call_function_queue(true);
if (local_softirq_pending())
do_softirq();
do_softirq_post_smp_call_flush(was_pending);
local_irq_restore(flags);
}