linux-kernel - [PATCH v2] nohz: ensure users are aware boot CPU is not NO_HZ

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Message-ID: <1391711781-7466-1-git-send-email-paul.gortmaker@windriver.com>
Date:	Thu, 6 Feb 2014 13:36:21 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH v2] nohz: ensure users are aware boot CPU is not NO_HZ_FULL

This bit of information is in the Kconfig help text:

  Note the boot CPU will still be kept outside the range to
  handle the timekeeping duty.

However neither the variable NO_HZ_FULL_ALL, or the prompt
convey this important detail, so lets add it to the prompt
to make it more explicitly obvious to the average user.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---

v2: use "CPU 0" instead of "boot CPU".

 kernel/time/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 3ce6e8c5f3fc..f448513a45ed 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -124,7 +124,7 @@ config NO_HZ_FULL
 endchoice
 
 config NO_HZ_FULL_ALL
-       bool "Full dynticks system on all CPUs by default"
+       bool "Full dynticks system on all CPUs by default (except CPU 0)"
        depends on NO_HZ_FULL
        help
          If the user doesn't pass the nohz_full boot option to
-- 
1.8.5.2

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