From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: [PATCH RT 05/14] ARM: imx: always use TWD on IMX6Q
Date: Tue, 12 Jul 2016 12:48:04 -0400 [thread overview]
Message-ID: <20160712164818.347448582@goodmis.org> (raw)
In-Reply-To: 20160712164759.154249453@goodmis.org
[-- Attachment #1: 0005-ARM-imx-always-use-TWD-on-IMX6Q.patch --]
[-- Type: text/plain, Size: 1090 bytes --]
3.14.72-rt76-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
There is no reason to limit the TWD to be used on SMP kernels only if the
hardware has it available.
On Wandboard i.MX6SOLO, running PREEMPT-RT and cyclictest I see as max
immediately after start in idle:
UP : ~90us
SMP: ~50us
UP + TWD: ~20us.
Based on this numbers I prefer the TWD over the slightly slower MXC
timer.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/arm/mach-imx/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 33567aa5880f..fd42876e4c91 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -794,7 +794,7 @@ config SOC_IMX6Q
select ARM_GIC
select CPU_V7
select HAVE_ARM_SCU if SMP
- select HAVE_ARM_TWD if SMP
+ select HAVE_ARM_TWD
select HAVE_IMX_ANATOP
select HAVE_IMX_GPC
select HAVE_IMX_MMDC
--
2.8.1
next prev parent reply other threads:[~2016-07-12 16:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 16:47 [PATCH RT 00/14] Linux 3.14.72-rt76-rc1 Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 01/14] kvm, rt: change async pagefault code locking for PREEMPT_RT Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 02/14] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object() Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 03/14] net: dev: always take qdiscs busylock in __dev_xmit_skb() Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 04/14] list_bl: fixup bogus lockdep warning Steven Rostedt
2016-07-12 16:48 ` Steven Rostedt [this message]
2016-07-12 16:48 ` [PATCH RT 06/14] perf/x86/intel/rapl: Make PMU lock raw Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 07/14] sched,preempt: Fix preempt_count manipulations Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 08/14] kernel/printk: Dont try to print from IRQ/NMI region Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 09/14] arm: lazy preempt: correct resched condition Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 10/14] locallock: add local_lock_on() Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 11/14] mm: perform lru_add_drain_all() remotely Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 12/14] trace: correct off by one while recording the trace-event Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 13/14] x86: Fix an RT MCE crash Steven Rostedt
2016-07-12 16:48 ` [PATCH RT 14/14] Linux 3.14.72-rt76-rc1 Steven Rostedt
2016-07-12 23:21 ` Linux 3.14.72-rt76-rc2 Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160712164818.347448582@goodmis.org \
--to=rostedt@goodmis.org \
--cc=C.Emde@osadl.org \
--cc=bigeasy@linutronix.de \
--cc=jkacur@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=paul.gortmaker@windriver.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.