Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE

From	Georg Müller <georgmueller@gmx.net>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE
Date	2021-10-27 10:30 +0200
Message-ID	<DcMtQ-73k-11@gated-at.bofh.it> (permalink)
References	<qtZXc-VN-13@gated-at.bofh.it> <qu40O-3rz-19@gated-at.bofh.it> <qu40O-3rz-19@gated-at.bofh.it> <qtZXc-VN-13@gated-at.bofh.it> <qu40O-3rz-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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> But for other configurations it is worse:
>
> config NO_HZ_FULL
>         bool "Full dynticks system (tickless)"
> ...
>          This is implemented at the expense of some overhead in user <-> kernel
>          transitions: syscalls, exceptions and interrupts. Even when it's
>          dynamically off.
>
>          Say N.
>


Upstream commit 176b8906 changed the description regarding NO_HZ_FULL:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=176b8906c399a170886ea4bad5b24763c6713d61


 > By default, without passing the nohz_full parameter, this behaves just
 > like NO_HZ_IDLE.
 >
 > If you're a distro say Y.

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Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Georg Müller <georgmueller@gmx.net> - 2021-10-27 10:30 +0200
  Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Salvatore Bonaccorso <carnil@debian.org> - 2021-10-30 16:10 +0200
    Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Henning Schild <henning.schild@siemens.com> - 2021-11-04 22:10 +0100
      Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Salvatore Bonaccorso <carnil@debian.org> - 2021-11-07 11:30 +0100
      Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Frederic Weisbecker <frederic@kernel.org> - 2021-11-13 00:40 +0100
        Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Salvatore Bonaccorso <carnil@debian.org> - 2021-11-13 08:50 +0100
        Bug#804857: linux: New feature: enable CONFIG_NO_HZ_FULL and CONFIG_RCU_NOCB_CPU/CONFIG_RCU_NOCB_CPU_NONE Henning Schild <henning.schild@siemens.com> - 2021-11-15 11:50 +0100

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