linux-kernel - Re: [PATCH v2] ACPI: Replace msleep() with usleep_range() in acpi_os

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Message-ID: <CAJvTdK=Q1kwWA6Wxn8Zcf0OicDEk6cHYFAvQVizgA47mXu63+g@mail.gmail.com>
Date: Wed, 20 Nov 2024 13:54:54 -0500
From: Len Brown <lenb@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>, anna-maria@...utronix.de, tglx@...utronix.de, 
	peterz@...radead.org, frederic@...nel.org, corbet@....net, 
	akpm@...ux-foundation.org, linux-acpi@...r.kernel.org, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Len Brown <len.brown@...el.com>, Todd Brandt <todd.e.brandt@...el.com>
Subject: Re: [PATCH v2] ACPI: Replace msleep() with usleep_range() in acpi_os_sleep().

On Wed, Nov 20, 2024 at 1:50 PM Rafael J. Wysocki <rafael@...nel.org> wrote:

> > 50 usec is likely more than enough in practice.
>
> And would you use the same slack value regardless of the sleep
> duration, or make it somehow depend on the sleep duration?

timerslack_ns is 50 usec for all user-space, no matter the duration.

This part was done right -- it doesn't depend on the sleep duration.

Coalescing depends on the pattern of wakeups over time.
That pattern doesn't necessarily depend on sleep duration,
so it is a hard sell to tie them together.


-- 
Len Brown, Intel