From: Sergei Shtylyov <sshtylyov@ru•mvista.com>
To: tglx@linutronix•de
Cc: linuxppc-dev@ozlabs•org, greg.weeks@timesys•com
Subject: [PATCH] PowerPC: dynamic tick support
Date: Thu, 9 Nov 2006 00:37:28 +0400 [thread overview]
Message-ID: <200611082337.28710.sshtylyov@ru.mvista.com> (raw)
Add dynamic tick support for PowerPC.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru•mvista.com>
---
This patch is reworked against 2.6.18-hrt-dyntick2 patchset.
Known issues:
1) with 2.6.18-hrt-dyntick2, dynamic tick mode causes bootup slowdown after the
HRT mode is entered (it seems to return to normal shortly);
2) with 2.6.18-rt7 (plus an extra patch to make it actually working :-) in the
kernel preemption mode other than RT, that slowdown seems permanent (this
was not happening with 2.6.18-rt6).
I don't have time to investigate now, so anybody interested is welcome to...
or I may even return to this if/when the time permits. :-)
arch/powerpc/kernel/idle.c | 4 ++++
1 files changed, 4 insertions(+)
Index: linux-2.6/arch/powerpc/kernel/idle.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/idle.c
+++ linux-2.6/arch/powerpc/kernel/idle.c
@@ -49,6 +49,8 @@ void cpu_idle(void)
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
+ hrtimer_stop_sched_tick();
+
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
@@ -82,6 +84,8 @@ void cpu_idle(void)
ppc64_runlatch_on();
if (cpu_should_die())
cpu_die();
+
+ hrtimer_restart_sched_tick();
preempt_enable_no_resched();
schedule();
preempt_disable();
next reply other threads:[~2006-11-08 20:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-08 20:37 Sergei Shtylyov [this message]
2007-03-16 22:09 ` [PATCH] PowerPC: dynamic tick support Sergei Shtylyov
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=200611082337.28710.sshtylyov@ru.mvista.com \
--to=sshtylyov@ru$(echo .)mvista.com \
--cc=greg.weeks@timesys$(echo .)com \
--cc=linuxppc-dev@ozlabs$(echo .)org \
--cc=tglx@linutronix$(echo .)de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox