linux-kernel - [tip: timers/nohz] tick/nohz: Update nohz

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Message-ID: <162091184822.29796.1242283230683760221.tip-bot2@tip-bot2>
Date:   Thu, 13 May 2021 13:17:28 -0000
From:   "tip-bot2 for Frederic Weisbecker" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/nohz] tick/nohz: Update nohz_full Kconfig help

The following commit has been merged into the timers/nohz branch of tip:

Commit-ID:     176b8906c399a170886ea4bad5b24763c6713d61
Gitweb:        https://git.kernel.org/tip/176b8906c399a170886ea4bad5b24763c6713d61
Author:        Frederic Weisbecker <frederic@...nel.org>
AuthorDate:    Thu, 13 May 2021 01:29:19 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 13 May 2021 14:21:21 +02:00

tick/nohz: Update nohz_full Kconfig help

CONFIG_NO_HZ_FULL behaves just like CONFIG_NO_HZ_IDLE by default.
Reassure distros about it.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/20210512232924.150322-6-frederic@kernel.org
---
 kernel/time/Kconfig | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 83e158d..7df71ef 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -117,13 +117,14 @@ config NO_HZ_FULL
 	 the task mostly runs in userspace and has few kernel activity.
 
 	 You need to fill up the nohz_full boot parameter with the
-	 desired range of dynticks CPUs.
+	 desired range of dynticks CPUs to use it. This is implemented at
+	 the expense of some overhead in user <-> kernel transitions:
+	 syscalls, exceptions and interrupts.
 
-	 This is implemented at the expense of some overhead in user <-> kernel
-	 transitions: syscalls, exceptions and interrupts. Even when it's
-	 dynamically off.
+	 By default, without passing the nohz_full parameter, this behaves just
+	 like NO_HZ_IDLE.
 
-	 Say N.
+	 If you're a distro say Y.
 
 endchoice