From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Venkatesh Pallipadi <venki@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Aaron Durbin <adurbin@google.com>, Paul Turner <pjt@google.com>,
Yong Zhang <yong.zhang0@gmail.com>,
linux-kernel@vger.kernel.org, Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Ralf Baechle <ralf@linux-mips.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 5/5] s390: Use common fork_idle_from_wq in smpboot
Date: Wed, 7 Mar 2012 08:00:00 +0100 [thread overview]
Message-ID: <20120307070000.GA4426@osiris.boeblingen.de.ibm.com> (raw)
In-Reply-To: <1331070074-31717-6-git-send-email-venki@google.com>
On Tue, Mar 06, 2012 at 01:41:14PM -0800, Venkatesh Pallipadi wrote:
> Cleanup. Instead of reimplementing fork_idle on wq and idle task caching,
> use fork_idle_from_wq().
>
> Signed-off-by: Venkatesh Pallipadi <venki@google.com>
> ---
> arch/s390/kernel/smp.c | 38 +++++---------------------------------
> 1 files changed, 5 insertions(+), 33 deletions(-)
Your patch won't apply on linux-next because of rather large code changes.
Anyway see below a patch that applies cleanly (and works) on s390.
Thanks for cleaning this up!
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
arch/s390/kernel/smp.c | 36 +++++-------------------------------
1 file changed, 5 insertions(+), 31 deletions(-)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -83,7 +83,6 @@ enum {
struct pcpu {
struct cpu cpu;
- struct task_struct *idle; /* idle process for the cpu */
struct _lowcore *lowcore; /* lowcore page(s) for the cpu */
unsigned long async_stack; /* async stack for the cpu */
unsigned long panic_stack; /* panic stack for the cpu */
@@ -724,26 +723,10 @@ static void __cpuinit smp_start_secondar
cpu_idle();
}
-struct create_idle {
- struct work_struct work;
- struct task_struct *idle;
- struct completion done;
- int cpu;
-};
-
-static void __cpuinit smp_fork_idle(struct work_struct *work)
-{
- struct create_idle *c_idle;
-
- c_idle = container_of(work, struct create_idle, work);
- c_idle->idle = fork_idle(c_idle->cpu);
- complete(&c_idle->done);
-}
-
/* Upping and downing of CPUs */
int __cpuinit __cpu_up(unsigned int cpu)
{
- struct create_idle c_idle;
+ struct task_struct *idle;
struct pcpu *pcpu;
int rc;
@@ -753,22 +736,14 @@ int __cpuinit __cpu_up(unsigned int cpu)
if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) !=
sigp_order_code_accepted)
return -EIO;
- if (!pcpu->idle) {
- c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
- INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
- c_idle.cpu = cpu;
- schedule_work(&c_idle.work);
- wait_for_completion(&c_idle.done);
- if (IS_ERR(c_idle.idle))
- return PTR_ERR(c_idle.idle);
- pcpu->idle = c_idle.idle;
- }
- init_idle(pcpu->idle, cpu);
+ idle = fork_idle_from_wq(cpu);
+ if (IS_ERR(idle))
+ return PTR_ERR(idle);
rc = pcpu_alloc_lowcore(pcpu, cpu);
if (rc)
return rc;
pcpu_prepare_secondary(pcpu, cpu);
- pcpu_attach_task(pcpu, pcpu->idle);
+ pcpu_attach_task(pcpu, idle);
pcpu_start_fn(pcpu, smp_start_secondary, NULL);
while (!cpu_online(cpu))
cpu_relax();
@@ -855,7 +830,6 @@ void __init smp_prepare_boot_cpu(void)
struct pcpu *pcpu = pcpu_devices;
boot_cpu_address = stap();
- pcpu->idle = current;
pcpu->state = CPU_STATE_CONFIGURED;
pcpu->address = boot_cpu_address;
pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix();
next prev parent reply other threads:[~2012-03-07 7:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-23 0:36 [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1 Venkatesh Pallipadi
2012-02-23 7:50 ` Ingo Molnar
2012-02-23 9:08 ` Peter Zijlstra
2012-02-23 20:04 ` Venki Pallipadi
2012-02-23 20:03 ` Venki Pallipadi
2012-03-02 0:33 ` Venki Pallipadi
2012-03-02 1:28 ` Suresh Siddha
2012-03-02 1:35 ` Venki Pallipadi
2012-03-02 1:37 ` Suresh Siddha
2012-03-02 2:00 ` Venki Pallipadi
2012-03-02 7:21 ` Ingo Molnar
2012-03-02 17:41 ` Suresh Siddha
2012-03-06 21:41 ` fork_idle from wq cleanup Venkatesh Pallipadi
2012-03-06 21:41 ` [PATCH 1/5] x86: Move fork_idle from wq and idle caching to common code Venkatesh Pallipadi
2012-03-06 21:41 ` [PATCH 2/5] ia64: Use common fork_idle_from_wq in smpboot Venkatesh Pallipadi
2012-03-06 21:41 ` [PATCH 3/5] mips: " Venkatesh Pallipadi
2012-03-06 22:51 ` Ralf Baechle
2012-03-06 21:41 ` [PATCH 4/5] powerpc: " Venkatesh Pallipadi
2012-03-06 21:41 ` [PATCH 5/5] s390: " Venkatesh Pallipadi
2012-03-07 7:00 ` Heiko Carstens [this message]
2012-03-07 6:06 ` fork_idle from wq cleanup Suresh Siddha
2012-02-23 9:30 ` [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1 Peter Zijlstra
2012-02-23 19:34 ` Venki Pallipadi
2012-02-24 5:41 ` Yong Zhang
2012-02-24 6:13 ` Yong Zhang
2012-02-27 8:38 ` Peter Zijlstra
2012-02-27 9:08 ` Yong Zhang
2012-02-27 9:30 ` Peter Zijlstra
2012-02-27 9:51 ` Yong Zhang
2012-02-26 1:32 ` Paul E. McKenney
2012-02-27 9:06 ` Yong Zhang
2012-02-27 17:05 ` Paul E. McKenney
2012-02-28 7:12 ` Yong Zhang
2012-02-28 13:05 ` Paul E. McKenney
2012-02-29 6:36 ` Yong Zhang
2012-02-27 8:45 ` Peter Zijlstra
2012-02-27 18:17 ` Venki Pallipadi
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=20120307070000.GA4426@osiris.boeblingen.de.ibm.com \
--to=heiko.carstens@de.ibm.com \
--cc=adurbin@google.com \
--cc=benh@kernel.crashing.org \
--cc=fenghua.yu@intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mingo@redhat.com \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=ralf@linux-mips.org \
--cc=schwidefsky@de.ibm.com \
--cc=suresh.b.siddha@intel.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=venki@google.com \
--cc=yong.zhang0@gmail.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).