linux-kernel - [PATCH v4 0/2] x86/resctrl: Fix task CLOSID update race

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Date:   Tue, 29 Nov 2022 12:10:53 +0100
From:   Peter Newman <peternewman@...gle.com>
To:     reinette.chatre@...el.com, fenghua.yu@...el.com
Cc:     bp@...en8.de, derkling@...gle.com, eranian@...gle.com,
        hpa@...or.com, james.morse@....com, jannh@...gle.com,
        kpsingh@...gle.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
        tglx@...utronix.de, x86@...nel.org,
        Peter Newman <peternewman@...gle.com>
Subject: [PATCH v4 0/2] x86/resctrl: Fix task CLOSID update race

Hi Reinette, Fenghua,

I've fixed the wording in changelogs and code comments throughout and
clarified the explanations as Reinette had requested.

The patch series addresses the IPI race we discussed in the container
move RFD thread[1]. The changelog in the patches should also provide a
good description.

Updates in v4:
 - Reorder the patches so that justification for sending more IPIs can
   reference the patch fixing __rdtgroup_move_task().
 - Correct tense of wording used in changelog and comments
Updates in v3:
 - Split the handling of multi-task and single-task operations into
   separate patches, now that they're handled differently.
 - Clarify justification in the commit message, including moving some of
   it out of inline code comment.
Updates in v2:
 - Following Reinette's suggestion: use task_call_func() for single
   task, IPI broadcast for group movements.
 - Rebased to v6.1-rc4

v1: https://lore.kernel.org/lkml/20221103141641.3055981-1-peternewman@google.com/
v2: https://lore.kernel.org/lkml/20221110135346.2209839-1-peternewman@google.com/
v3: https://lore.kernel.org/lkml/20221115141953.816851-1-peternewman@google.com/

Thanks!
-Peter

[1] https://lore.kernel.org/all/CALPaoCg2-9ARbK+MEgdvdcjJtSy_2H6YeRkLrT97zgy8Aro3Vg@mail.gmail.com/

Peter Newman (2):
  x86/resctrl: Update task closid/rmid with task_call_func()
  x86/resctrl: IPI all online CPUs for group updates

 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 130 ++++++++++++-------------
 1 file changed, 60 insertions(+), 70 deletions(-)


base-commit: eb7081409f94a9a8608593d0fb63a1aa3d6f95d8
--
2.38.1.584.g0f3c55d4c2-goog