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Filename Latest commit message Latest commit date
Valentin Schneider 3f130a37c4 sched/fair: Don't increase sd->balance_interval on newidle balance
When load_balance() fails to move some load because of task affinity,
we end up increasing sd->balance_interval to delay the next periodic
balance in the hopes that next time we look, that annoying pinned
task(s) will be gone.

However, idle_balance() pays no attention to sd->balance_interval, yet
it will still lead to an increase in balance_interval in case of
pinned tasks.

If we're going through several newidle balances (e.g. we have a
periodic task), this can lead to a huge increase of the
balance_interval in a very small amount of time.

To prevent that, don't increase the balance interval when going
through a newidle balance.

This is a similar approach to what is done in commit 58b26c4c02
("sched: Increment cache_nice_tries only on periodic lb"), where we
disregard newidle balance and rely on periodic balance for more stable
results.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar.Eggemann@arm.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: patrick.bellasi@arm.com
Cc: vincent.guittot@linaro.org
Link: http://lkml.kernel.org/r/1537974727-30788-2-git-send-email-valentin.schneider@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-11-04 00:59:23 +01:00
arch Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
block Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
certs
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-10-25 16:43:35 -07:00
Documentation Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
drivers i2c-hid: properly terminate i2c_hid_dmi_desc_override_table[] array 2018-10-27 09:10:48 -07:00
firmware
fs Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
include Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
init psi: cgroup support 2018-10-26 16:26:32 -07:00
ipc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-25 11:14:36 -07:00
kernel sched/fair: Don't increase sd->balance_interval on newidle balance 2018-11-04 00:59:23 +01:00
lib Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
LICENSES This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
mm hugetlbfs: dirty pages as they are added to pagecache 2018-10-26 16:38:16 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-10-26 19:25:07 -07:00
samples Char/Misc driver patches for 4.20-rc1 2018-10-26 09:11:43 -07:00
scripts Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
security Merge branch 'next-loadpin' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2018-10-25 13:32:00 -07:00
sound sound updates for 4.20 2018-10-25 09:00:15 -07:00
tools Merge branch 'akpm' (patches from Andrew) 2018-10-26 19:33:41 -07:00
usr
virt Revert "mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks" 2018-10-26 16:25:19 -07:00
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MAINTAINERS Char/Misc driver patches for 4.20-rc1 2018-10-26 09:11:43 -07:00
Makefile Devicetree updates for 4.20: 2018-10-26 12:09:58 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.