From: Joao Martins <joao.m.martins@oracle.com>
To: linux-pm@vger.kernel.org
Cc: Joao Martins <joao.m.martins@oracle.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org
Subject: [PATCH v1 2/4] cpuidle-haltpoll: set haltpoll as preferred governor
Date: Tue, 3 Sep 2019 12:39:11 +0100 [thread overview]
Message-ID: <20190903113913.9257-3-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20190903113913.9257-1-joao.m.martins@oracle.com>
Right now, guest current governors have the following ratings:
* ladder -> 10
* teo -> 19
* menu -> 20
* haltpoll -> 21
* ladder + nohz=off -> 25
haltpoll governor got introduced and it is now the default governor given
its highest rating -- with ladder+nohz being the exception -- regardless of
idle driver in the guest. An example of an undesirable case is x86 KVM
guests with MWAIT which have intel_idle registered first, and consequently
will have haltpoll be used as governor which would get limited to a poll
state and state 1 and the other states wouldn't get used.
To keep the previous defaults we decrease rating of governor to 9 (below
current lowest rating) and thus rely on @governor switch on
cpuidle_register_driver() to tie in haltpoll idle driver and governor
together.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
drivers/cpuidle/cpuidle-haltpoll.c | 1 +
drivers/cpuidle/governors/haltpoll.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c
index 56d8ab814466..519e90d125cf 100644
--- a/drivers/cpuidle/cpuidle-haltpoll.c
+++ b/drivers/cpuidle/cpuidle-haltpoll.c
@@ -34,6 +34,7 @@ static int default_enter_idle(struct cpuidle_device *dev,
static struct cpuidle_driver haltpoll_driver = {
.name = "haltpoll",
+ .governor = "haltpoll",
.owner = THIS_MODULE,
.states = {
{ /* entry 0 is for polling */ },
diff --git a/drivers/cpuidle/governors/haltpoll.c b/drivers/cpuidle/governors/haltpoll.c
index 797477bda486..7a703d2e0064 100644
--- a/drivers/cpuidle/governors/haltpoll.c
+++ b/drivers/cpuidle/governors/haltpoll.c
@@ -133,7 +133,7 @@ static int haltpoll_enable_device(struct cpuidle_driver *drv,
static struct cpuidle_governor haltpoll_governor = {
.name = "haltpoll",
- .rating = 21,
+ .rating = 9,
.enable = haltpoll_enable_device,
.select = haltpoll_select,
.reflect = haltpoll_reflect,
--
2.17.1
next prev parent reply other threads:[~2019-09-03 11:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 11:39 [PATCH v1 0/4] cpuidle, haltpoll: governor switching on idle register Joao Martins
2019-09-03 11:39 ` [PATCH v1 1/4] cpuidle: allow governor switch on cpuidle_register_driver() Joao Martins
2019-09-03 11:39 ` Joao Martins [this message]
2019-09-03 11:39 ` [PATCH v1 3/4] cpuidle-haltpoll: return -ENODEV on modinit failure Joao Martins
2019-09-03 11:39 ` [PATCH v1 4/4] cpuidle-haltpoll: do not set an owner to allow modunload Joao Martins
2019-09-03 13:23 ` [PATCH v1 0/4] cpuidle, haltpoll: governor switching on idle register Joao Martins
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