linux-kernel - [PATCH 0/6] ppc, kvm, cpuidle: Allow offline and kvm standby threads to enter fastsleep

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 28 May 2014 10:08:34 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
	svaidyan@...ibm.com, paulus@...ba.org,
	srivatsa.bhat@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 0/6] ppc, kvm,
 cpuidle: Allow offline and kvm standby threads to enter fastsleep

Fast sleep is a deep idle state on Power8. The support for the state was
added in commit 0d94873011. Today the idle threads in the host can
potentially be put to fast sleep. But when we launch guests using kvm,
the secondary threads are required to be offline and the offline threads
are put to nap. Besides this case, when secondary threads are woken up
to run guests and eventually go idle or when the guest is killed, they
enter nap. So when the entire core goes idle in both the above scenarios,
the maximum power savings that we can obtain is as much as we can get from
napping the cpus. This patchset adds support in the above two cases
for the threads to enter fast sleep.
---

Srivatsa S. Bhat (6):
      powernv, cpuidle: Move the flags used for idle state discovery to powernv core
      powerpc, powernv, CPU hotplug: Put offline CPUs in Fast-Sleep instead of Nap
      KVM: PPC: Book3S HV: Enable CPUs to run guest after waking up from fast-sleep
      KVM: PPC: Book3S HV: Consolidate the idle-state enter sequence in KVM
      KVM: PPC: Book3S HV: Put KVM standby hwthreads to fast-sleep instead of nap
      ppc,book3s: Go back to same idle state after handling machine check interrupt


 arch/powerpc/include/asm/processor.h    |   12 ++++
 arch/powerpc/kernel/exceptions-64s.S    |   51 +++++++++------
 arch/powerpc/kernel/idle.c              |   52 ++++++++++++++++
 arch/powerpc/kernel/idle_power7.S       |    2 -
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |  103 ++++++++++++++++++++++++-------
 arch/powerpc/platforms/powernv/smp.c    |   12 +++-
 drivers/cpuidle/cpuidle-powernv.c       |    7 +-
 7 files changed, 190 insertions(+), 49 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/