From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-x241.google.com (mail-pg0-x241.google.com [IPv6:2607:f8b0:400e:c05::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xdpBQ2Wn7zDrK0 for ; Fri, 25 Aug 2017 14:30:54 +1000 (AEST) Received: by mail-pg0-x241.google.com with SMTP id t3so2161362pgt.5 for ; Thu, 24 Aug 2017 21:30:54 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , kvm-ppc@vger.kernel.org, Paul Mackerras Subject: [PATCH v3 0/4] powerpc/64s: idle POWER9 stop improvements Date: Fri, 25 Aug 2017 14:30:32 +1000 Message-Id: <20170825043036.18236-1-npiggin@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , These are rebased patches leftover from the unmerged bit of the idle series. Based on feedback, I dropped one of the KVM patches, and reworked the code a bit so it is easier to restore the ability for KVM to grab secondaries into real mode. I did a bit more benchmarking, and all up these patches improve 2 CPU ping-pong context switch benchmark on a POWER9 by around 4-6% (depending on what CPUs and idle states are used). Nicholas Piggin (4): KVM: PPC: Book3S HV: POWER9 does not require secondary thread management powerpc/64s: idle POWER9 can execute stop without a sync sequence powerpc/64s: idle POWER9 can execute stop in virtual mode powerpc/64s: idle ESL=0 stop can avoid MSR and save/restore overhead arch/powerpc/include/asm/cpuidle.h | 16 ----- arch/powerpc/include/asm/kvm_book3s_asm.h | 4 ++ arch/powerpc/kernel/idle_book3s.S | 103 ++++++++++++++++++++++-------- arch/powerpc/kvm/book3s_hv.c | 14 +++- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +++ 5 files changed, 101 insertions(+), 44 deletions(-) -- 2.13.3 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicholas Piggin Date: Fri, 25 Aug 2017 04:30:32 +0000 Subject: [PATCH v3 0/4] powerpc/64s: idle POWER9 stop improvements Message-Id: <20170825043036.18236-1-npiggin@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , kvm-ppc@vger.kernel.org, Paul Mackerras These are rebased patches leftover from the unmerged bit of the idle series. Based on feedback, I dropped one of the KVM patches, and reworked the code a bit so it is easier to restore the ability for KVM to grab secondaries into real mode. I did a bit more benchmarking, and all up these patches improve 2 CPU ping-pong context switch benchmark on a POWER9 by around 4-6% (depending on what CPUs and idle states are used). Nicholas Piggin (4): KVM: PPC: Book3S HV: POWER9 does not require secondary thread management powerpc/64s: idle POWER9 can execute stop without a sync sequence powerpc/64s: idle POWER9 can execute stop in virtual mode powerpc/64s: idle ESL=0 stop can avoid MSR and save/restore overhead arch/powerpc/include/asm/cpuidle.h | 16 ----- arch/powerpc/include/asm/kvm_book3s_asm.h | 4 ++ arch/powerpc/kernel/idle_book3s.S | 103 ++++++++++++++++++++++-------- arch/powerpc/kvm/book3s_hv.c | 14 +++- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +++ 5 files changed, 101 insertions(+), 44 deletions(-) -- 2.13.3