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From:   Peter Oskolkov <posk@posk.io>
To:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Darren Hart <dvhart@infradead.org>,
        Vincent Guittot <vincent.guittot@linaro.org>
Cc:     Peter Oskolkov <posk@google.com>, Andrei Vagin <avagin@google.com>,
        Paul Turner <pjt@google.com>, Ben Segall <bsegall@google.com>,
        Aaron Lu <aaron.lwe@gmail.com>
Subject: [PATCH for 5.9 v2 0/4] FUTEX_SWAP (tip/locking/core)
Date:   Mon,  3 Aug 2020 15:15:06 -0700
Message-Id: <20200803221510.170674-1-posk@posk.io>
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From: Peter Oskolkov <posk@google.com>

This patchset introduces FUTEX_SWAP operation for fast
task context switching (aided by futexes). Detailed
use cases and reasoning are included in the commit message
of the first patch in the patchset.

v1->v2:
- split two #defines in futex.h into a small first patch
- detailed the use cases and reasoning in the commit message
  of the first patch
- renamed wake_up_process_prefer_current_cpu into wake_up_swap.


Peter Oskolkov (4):
  futex: introduce FUTEX_SWAP operation
  futex: implement FUTEX_SWAP as wake+wait.
  futex/sched: add wake_up_swap, use in FUTEX_SWAP
  selftests/futex: add futex_swap selftest

 include/linux/sched.h                         |   6 +
 include/uapi/linux/futex.h                    |   2 +
 kernel/futex.c                                |  86 +++++--
 kernel/sched/core.c                           |   5 +
 kernel/sched/fair.c                           |   3 +
 kernel/sched/sched.h                          |   1 +
 .../selftests/futex/functional/.gitignore     |   1 +
 .../selftests/futex/functional/Makefile       |   1 +
 .../selftests/futex/functional/futex_swap.c   | 209 ++++++++++++++++++
 .../selftests/futex/include/futextest.h       |  19 ++
 10 files changed, 318 insertions(+), 15 deletions(-)
 create mode 100644 tools/testing/selftests/futex/functional/futex_swap.c

-- 
2.25.1