[GIT PULL] sched/psi changes for v6.1

[Ingo Molnar]

Linus,

Please pull the latest sched/psi git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-psi-2022-10-14

   # HEAD: 34f26a15611afb03c33df6819359d36f5b382589 sched/psi: Per-cgroup PSI accounting disable/re-enable interface

PSI updates for v6.1:

 - Various performance optimizations, resulting in a 4%-9% speedup
   in the mmtests/config-scheduler-perfpipe micro-benchmark.

 - New interface to turn PSI on/off on a per cgroup level.

MERGE NOTES:

 - The cgroup interface was suggested & acked by the cgroup maintainers.

 - There's a merge commit in the tree, because the changes rely on
   driver-core kernfs changes to hit upstream first. This is why
   this tree was sent late in the merge window as well.

 - There will be a new conflict in kernel/cgroup/cgroup.c when
   merged into your tree at 9c9155a3509a.

   Most of the conflicts are straightforward, but there's a semantic
   conflict between these two commits:

     cgroup-tree/upstream:   8a693f7766f9 ("cgroup: Remove CFTYPE_PRESSURE")
     sched/psi tree:         34f26a15611a ("sched/psi: Per-cgroup PSI accounting disable/re-enable interface")

   8a693f7766f9 removes the CFTYPE_PRESSURE flag, while 34f26a15611a adds
   new uses. This semantic conflict will result in a build failure on
   certain configs.

   The resolution I used in -tip is to remove the two new lines adding
   CFTYPE_PRESSURE flags use in 34f26a15611a.

Thanks,

	Ingo

------------------>

Chengming Zhou (9):
      sched/psi: Fix periodic aggregation shut off
      sched/psi: Don't create cgroup PSI files when psi_disabled
      sched/psi: Save percpu memory when !psi_cgroups_enabled
      sched/psi: Move private helpers to sched/stats.h
      sched/psi: Optimize task switch inside shared cgroups again
      sched/psi: Add PSI_IRQ to track IRQ/SOFTIRQ pressure
      sched/psi: Consolidate cgroup_psi()
      sched/psi: Cache parent psi_group to speed up group iteration
      sched/psi: Per-cgroup PSI accounting disable/re-enable interface

Johannes Weiner (1):
      sched/psi: Remove NR_ONCPU task accounting

Peter Zijlstra (1):
      Merge branch 'driver-core/driver-core-next'

 Documentation/admin-guide/cgroup-v2.rst |  23 +++
 include/linux/cgroup-defs.h             |   3 +
 include/linux/cgroup.h                  |   5 -
 include/linux/psi.h                     |  12 +-
 include/linux/psi_types.h               |  31 ++--
 kernel/cgroup/cgroup.c                  | 104 +++++++++++-
 kernel/sched/core.c                     |   1 +
 kernel/sched/psi.c                      | 280 +++++++++++++++++++++++---------
 kernel/sched/stats.h                    |   6 +
 9 files changed, 362 insertions(+), 103 deletions(-)