linux-kernel - Re: [PATCH 02/30] thread_info: selector for TIF_NEED_RESCHED[

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Message-ID: <20240221132651.5d1b0a24@gandalf.local.home>
Date: Wed, 21 Feb 2024 13:26:51 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Ankur Arora <ankur.a.arora@...cle.com>
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, peterz@...radead.org,
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Subject: Re: [PATCH 02/30] thread_info: selector for TIF_NEED_RESCHED[_LAZY]

On Mon, 12 Feb 2024 21:55:26 -0800
Ankur Arora <ankur.a.arora@...cle.com> wrote:

> +/*
> + * tif_resched(r) maps to TIF_NEED_RESCHED[_LAZY] with CONFIG_PREEMPT_AUTO.
> + *
> + * With !CONFIG_PREEMPT_AUTO, both tif_resched(NR_now) and tif_resched(NR_lazy)
> + * reduce to the same value (TIF_NEED_RESCHED) leaving any scheduling behaviour
> + * unchanged.
> + */
> +static inline int tif_resched(resched_t rs)
> +{
> +	return TIF_NEED_RESCHED + rs * TIF_NEED_RESCHED_LAZY_OFFSET;
> +}
> +
> +static inline int _tif_resched(resched_t rs)
> +{
> +	return 1 << tif_resched(rs);
> +}
> +

This may have been mentioned in another thread (don't remember) but please
make the above __always_inline, as that also matches tif_need_resched() as
it is today.

-- Steve