linux-kernel - [PATCH 0/2] Backport uclamp static key to 5.4.y stable

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Message-Id: <20200828125610.30943-1-qais.yousef@arm.com>
Date:   Fri, 28 Aug 2020 13:56:08 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Qais Yousef <qais.yousef@....com>
Subject: [PATCH 0/2] Backport uclamp static key to 5.4.y stable

Hi Greg/Sasha

The following 2 patches are backports of

	46609ce22703: ("sched/uclamp: Protect uclamp fast path code with static key")
	e65855a52b47: ("sched/uclamp: Fix a deadlock when enabling uclamp static key")

into 5.4.y stable tree. The conflict was trivial and due to:

	1. uclamp_rq_util_with() was renamed from util_util_with()
	2. 2 local variables were converted to unsigned long from unsigned int.

I did do compile test on aarch64 and x86_64 and both looked fine. Beside I ran
a quick and short mmtest to verify the functionality and got the following
results which is inline with what's expected.

                        5.4.y                  5.4.y-static-keys
Hmean     send-64       188.46 (   0.00%)      189.95 *   0.79%*
Hmean     send-128      375.65 (   0.00%)      379.75 *   1.09%*

7.32%     -0.33%  [kernel.kallsyms]        [k] try_to_wake_up
0.58%     -0.55%  [kernel.kallsyms]        [k] deactivate_task
0.50%     -0.45%  [kernel.kallsyms]        [k] activate_task


That said, it's Friday afternoon and I am off next week. If I did something
stupid and didn't find me, please accept my apologies in advance and will fix
it as soon as I am back online.

Thanks

--
Qais Yousef


Qais Yousef (2):
  sched/uclamp: Protect uclamp fast path code with static key
  sched/uclamp: Fix a deadlock when enabling uclamp static key

 kernel/sched/core.c              | 81 +++++++++++++++++++++++++++++++-
 kernel/sched/cpufreq_schedutil.c |  2 +-
 kernel/sched/sched.h             | 47 +++++++++++++++++-
 3 files changed, 126 insertions(+), 4 deletions(-)

-- 
2.17.1