From: "Paul E. McKenney" <paulmck@kernel.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Michal Hocko <mhocko@suse.com>
Subject: Re: [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v4
Date: Fri, 22 Jan 2021 07:02:14 -0800 [thread overview]
Message-ID: <20210122150214.GD2743@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20210118141223.123667-1-frederic@kernel.org>
On Mon, Jan 18, 2021 at 03:12:15PM +0100, Frederic Weisbecker wrote:
> Hi,
>
> Here is a new version of the feature that can select the preempt flavour
> on boot time. Note that it doesn't entirely mimic the actual real
> config-based preemption flavours, because at least preempt-RCU
> implementation is there in any case.
>
> Also there is still some work to do against subsystems that may play
> their own games with CONFIG_PREEMPT.
>
> In this version:
>
> * Restore the initial simple __static_call_return0() implementation.
>
> * Uninline __static_call_return0 on all flavours since its address is
> always needed on DEFINE_STATIC_CALL()
>
> * Introduce DEFINE_STATIC_CALL_RET0()
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> preempt/dynamic-v4
>
> HEAD: b5f3b1da9df4197d0b0ffe0f55f0f6a8c838d75f
I gave these a quick test and got the following:
Warning: Kernel ABI header at 'tools/include/linux/static_call_types.h' differs from latest version at 'include/linux/static_call_types.h'.
Other than that, looks good.
Thanx, Paul
> Thanks,
> Frederic
> ---
>
> Peter Zijlstra (Intel) (4):
> preempt/dynamic: Provide cond_resched() and might_resched() static calls
> preempt/dynamic: Provide preempt_schedule[_notrace]() static calls
> preempt/dynamic: Provide irqentry_exit_cond_resched() static call
> preempt/dynamic: Support dynamic preempt with preempt= boot option
>
> Peter Zijlstra (2):
> static_call/x86: Add __static_call_return0()
> static_call: Pull some static_call declarations to the type headers
>
> Frederic Weisbecker (1):
> static_call: Provide DEFINE_STATIC_CALL_RET0()
>
> Michal Hocko (1):
> preempt: Introduce CONFIG_PREEMPT_DYNAMIC
>
>
> Documentation/admin-guide/kernel-parameters.txt | 7 ++
> arch/Kconfig | 9 +++
> arch/x86/Kconfig | 1 +
> arch/x86/include/asm/preempt.h | 34 ++++++---
> arch/x86/kernel/static_call.c | 17 ++++-
> include/linux/entry-common.h | 4 ++
> include/linux/kernel.h | 23 ++++--
> include/linux/sched.h | 27 ++++++-
> include/linux/static_call.h | 43 ++++--------
> include/linux/static_call_types.h | 29 ++++++++
> kernel/Kconfig.preempt | 19 +++++
> kernel/entry/common.c | 10 ++-
> kernel/sched/core.c | 93 ++++++++++++++++++++++++-
> kernel/static_call.c | 5 ++
> 14 files changed, 271 insertions(+), 50 deletions(-)
prev parent reply other threads:[~2021-01-22 15:12 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 14:12 Frederic Weisbecker
2021-01-18 14:12 ` [RFC PATCH 1/8] static_call/x86: Add __static_call_return0() Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-18 14:12 ` [RFC PATCH 2/8] static_call: Provide DEFINE_STATIC_CALL_RET0() Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Frederic Weisbecker
2021-02-17 13:17 ` tip-bot2 for Frederic Weisbecker
2021-01-18 14:12 ` [RFC PATCH 3/8] static_call: Pull some static_call declarations to the type headers Frederic Weisbecker
2021-01-19 10:46 ` Jürgen Groß
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-18 14:12 ` [RFC PATCH 4/8] preempt: Introduce CONFIG_PREEMPT_DYNAMIC Frederic Weisbecker
2021-01-22 16:53 ` Peter Zijlstra
2021-01-28 12:17 ` Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Michal Hocko
2021-02-17 13:17 ` tip-bot2 for Michal Hocko
2021-01-18 14:12 ` [RFC PATCH 5/8] preempt/dynamic: Provide cond_resched() and might_resched() static calls Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 6/8] preempt/dynamic: Provide preempt_schedule[_notrace]() " Frederic Weisbecker
2021-01-21 21:58 ` Peter Zijlstra
2021-01-21 22:25 ` Peter Zijlstra
2021-01-22 16:52 ` Peter Zijlstra
2021-01-22 16:57 ` Ard Biesheuvel
2021-01-22 17:08 ` Peter Zijlstra
2021-02-08 12:00 ` [tip: sched/core] sched: Add /debug/sched_preempt tip-bot2 for Peter Zijlstra
2021-02-09 15:45 ` tip-bot2 for Peter Zijlstra
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra
2021-01-25 23:40 ` [RFC PATCH 6/8] preempt/dynamic: Provide preempt_schedule[_notrace]() static calls Josh Poimboeuf
2021-01-26 9:24 ` Peter Zijlstra
2021-01-26 23:57 ` Josh Poimboeuf
2021-01-27 9:13 ` Peter Zijlstra
2021-01-27 11:27 ` Peter Zijlstra
2021-01-27 15:59 ` Josh Poimboeuf
2021-01-27 16:19 ` Peter Zijlstra
2021-01-27 16:33 ` Josh Poimboeuf
2021-01-27 18:44 ` Peter Zijlstra
2021-01-27 19:00 ` Josh Poimboeuf
2021-01-27 19:02 ` Josh Poimboeuf
2021-01-27 23:18 ` Josh Poimboeuf
2021-02-03 14:04 ` Peter Zijlstra
2021-02-05 15:30 ` Peter Zijlstra
2021-02-06 2:31 ` Josh Poimboeuf
2021-02-06 9:03 ` Peter Zijlstra
2021-02-05 15:22 ` Peter Zijlstra
2021-02-08 12:00 ` [tip: sched/core] static_call: Allow module use without exposing static_call_key tip-bot2 for Josh Poimboeuf
2021-02-09 15:45 ` tip-bot2 for Josh Poimboeuf
2021-02-17 13:17 ` tip-bot2 for Josh Poimboeuf
2021-02-08 12:00 ` [tip: sched/core] preempt/dynamic: Provide preempt_schedule[_notrace]() static calls tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 7/8] preempt/dynamic: Provide irqentry_exit_cond_resched() static call Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-18 14:12 ` [RFC PATCH 8/8] preempt/dynamic: Support dynamic preempt with preempt= boot option Frederic Weisbecker
2021-02-08 12:00 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-02-09 15:45 ` tip-bot2 for Peter Zijlstra (Intel)
2021-02-17 13:17 ` tip-bot2 for Peter Zijlstra (Intel)
2021-01-21 21:22 ` [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v4 Peter Zijlstra
2021-01-22 15:02 ` Paul E. McKenney [this message]
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