linux-kernel - [PATCH 3/4] acpi: exsystem: Warn about sleeps greater than 50 ms

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Date:   Thu, 24 Feb 2022 12:38:05 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Robert Moore <robert.moore@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>, linux-acpi@...r.kernel.org,
        devel@...ica.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] acpi: exsystem: Warn about sleeps greater than 50 ms

Quick boottime is important, so warn about sleeps greater than 50 ms in
ACPI.

50 ms is still long compared to distribution Linux kernels reaching initrd
in 350 ms, so should probably changed to 10 ms, so people are aware
about this.

Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 drivers/acpi/acpica/exsystem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
index 00f66af31ffa..bdffb8aac05c 100644
--- a/drivers/acpi/acpica/exsystem.c
+++ b/drivers/acpi/acpica/exsystem.c
@@ -167,6 +167,11 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long_ms)
 
 	acpi_ex_exit_interpreter();
 
+	if (how_long_ms > 50) {
+		ACPI_WARNING((AE_INFO,
+		    "Time parameter %llu > 50 ms. Please contact firmware vendor for more responsive system.", how_long_ms));
+	}
+
 	/*
 	 * For compatibility with other ACPI implementations and to prevent
 	 * accidental deep sleeps, limit the sleep time to something reasonable.
-- 
2.35.1