From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E . McKenney" <paulmck@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Michal Hocko <mhocko@suse.com>
Subject: Re: [RFC PATCH 6/7] preempt/dynamic: Provide irqentry_exit_cond_resched() static call
Date: Tue, 10 Nov 2020 11:32:21 +0100 [thread overview]
Message-ID: <20201110103221.GC2594@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20201110005609.40989-7-frederic@kernel.org>
On Tue, Nov 10, 2020 at 01:56:08AM +0100, Frederic Weisbecker wrote:
> [convert from static key to static call, only define static call when
> PREEMPT_DYNAMIC]
> noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state)
> {
> @@ -383,8 +386,13 @@ noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state)
> }
>
> instrumentation_begin();
> - if (IS_ENABLED(CONFIG_PREEMPTION))
> + if (IS_ENABLED(CONFIG_PREEMPTION)) {
> +#ifdef CONFIG_PREEMT_DYNAMIC
> + static_call(irqentry_exit_cond_resched)();
> +#else
> irqentry_exit_cond_resched();
> +#endif
> + }
> /* Covers both tracing and lockdep */
> trace_hardirqs_on();
> instrumentation_end();
The reason I had this a static_branch() is that because if you look at
the code-gen of this function, you'll find it will inline the call.
Not sure it matters much, but it avoids a CALL+RET.
next prev parent reply other threads:[~2020-11-10 10:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 0:56 [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v3 Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 1/7] static_call/x86: Add __static_call_returnl0() Frederic Weisbecker
2020-11-10 9:55 ` Peter Zijlstra
2020-11-10 10:13 ` Peter Zijlstra
2020-11-10 13:42 ` Frederic Weisbecker
2020-11-10 13:53 ` Peter Zijlstra
2020-11-10 13:24 ` Frederic Weisbecker
2020-11-10 10:06 ` Peter Zijlstra
2020-11-10 0:56 ` [RFC PATCH 2/7] static_call: Pull some static_call declarations to the type headers Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 3/7] preempt: Introduce CONFIG_PREEMPT_DYNAMIC Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 4/7] preempt/dynamic: Provide cond_resched() and might_resched() static calls Frederic Weisbecker
2020-11-10 10:39 ` Peter Zijlstra
2020-11-10 10:48 ` Peter Zijlstra
2021-01-18 13:58 ` Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 5/7] preempt/dynamic: Provide preempt_schedule[_notrace]() " Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 6/7] preempt/dynamic: Provide irqentry_exit_cond_resched() static call Frederic Weisbecker
2020-11-10 10:32 ` Peter Zijlstra [this message]
2020-11-10 13:45 ` Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 7/7] preempt/dynamic: Support dynamic preempt with preempt= boot option Frederic Weisbecker
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