From: kernelfans@gmail.com
To: linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org
Cc: Paul Mackerras <paulus@samba.org>, Alexander Graf <agraf@suse.de>
Subject: [RFC 10/11] powerpc: kvm: on_primary_thread() force the secondary threads into NAP mode
Date: Thu, 16 Oct 2014 15:29:59 -0400 [thread overview]
Message-ID: <1413487800-7162-11-git-send-email-kernelfans@gmail.com> (raw)
In-Reply-To: <1413487800-7162-1-git-send-email-kernelfans@gmail.com>
The primary hwthread ceases the scheduler of secondary hwthread by
bringing them into NAP. Then, the secondary is ready for guest.
Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
---
arch/powerpc/kvm/book3s_hv.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 4348abd..7896c31 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1593,15 +1593,22 @@ static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr;
+ struct cpumask msk;
/* Are we on a primary subcore? */
if (cpu_thread_in_subcore(cpu))
return 0;
thr = 0;
+#ifdef KVMPPC_ENABLE_SECONDARY
+ while (++thr < threads_per_subcore)
+ cpumask_set_cpu(thr, &msk);
+ stop_cpus_async(&msk, kvmppc_secondary_stopper, NULL);
+#else
while (++thr < threads_per_subcore)
if (cpu_online(cpu + thr))
return 0;
+#endif
/* Grab all hw threads so they can't go into the kernel */
for (thr = 1; thr < threads_per_subcore; ++thr) {
--
1.8.3.1
next prev parent reply other threads:[~2014-10-16 7:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 19:29 [RFC 00/11]: powerKVM, release the compute power of secondary hwthread on host kernelfans
2014-10-16 19:29 ` [RFC 01/11] sched: introduce sys_cpumask in tsk to adapt asymmetric system kernelfans
2014-11-12 9:22 ` Srikar Dronamraju
2014-11-18 5:07 ` Liu ping fan
2014-10-16 19:29 ` [RFC 02/11] powerpc: kvm: ensure vcpu-thread run only on primary hwthread kernelfans
2014-11-12 10:17 ` Srikar Dronamraju
2014-10-16 19:29 ` [RFC 03/11] powerpc: kvm: add interface to control kvm function on a core kernelfans
2014-10-27 4:04 ` Preeti U Murthy
2014-11-18 5:17 ` Liu ping fan
2014-11-12 13:01 ` Srikar Dronamraju
2014-10-16 19:29 ` [RFC 04/11] powerpc: kvm: introduce a kthread on primary thread to anti tickless kernelfans
2014-10-27 4:45 ` Preeti U Murthy
2014-11-18 5:24 ` Liu ping fan
2014-10-16 19:29 ` [RFC 05/11] sched: introduce stop_cpus_async() to schedule special tsk on cpu kernelfans
2014-10-16 19:29 ` [RFC 06/11] powerpc: kvm: introduce online in paca to indicate whether cpu is needed by host kernelfans
2014-10-27 5:32 ` Preeti U Murthy
2014-11-18 5:29 ` Liu ping fan
2014-10-16 19:29 ` [RFC 07/11] powerpc: kvm: the stopper func to cease secondary hwthread kernelfans
2014-10-22 7:12 ` Preeti U Murthy
2014-10-27 6:07 ` Preeti U Murthy
2014-10-16 19:29 ` [RFC 08/11] powerpc: kvm: add a flag in vcore to sync primary with secondry hwthread kernelfans
2014-10-27 6:28 ` Preeti U Murthy
2014-10-16 19:29 ` [RFC 09/11] powerpc: kvm: handle time base on secondary hwthread kernelfans
2014-10-27 6:40 ` Preeti U Murthy
2014-11-18 5:43 ` Liu ping fan
2014-10-16 19:29 ` kernelfans [this message]
2014-10-16 19:30 ` [RFC 11/11] powerpc: kvm: Kconfig add an option for enabling " kernelfans
2014-10-27 6:44 ` Preeti U Murthy
2014-11-18 5:47 ` Liu ping fan
2014-11-18 17:54 ` [RFC 00/11]: powerKVM, release the compute power of secondary hwthread on host Alexander Graf
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