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Mon, 18 Nov 2024 11:41:23 +0000 (GMT) From: Kajol Jain To: mpe@ellerman.id.au, maddy@linux.ibm.com Cc: atrajeev@linux.vnet.ibm.com, kjain@linux.ibm.com, disgoel@linux.ibm.com, hbathini@linux.ibm.com, adubey@linux.ibm.com, gautam@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Kajol Jain Subject: [PATCH v2 3/4] powerpc/kvm: Add vpa latency counters to kvm_vcpu_arch Date: Mon, 18 Nov 2024 17:11:13 +0530 Message-ID: <20241118114114.208964-3-kjain@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241118114114.208964-1-kjain@linux.ibm.com> References: <20241118114114.208964-1-kjain@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: NfAgXiN8f7FgSlRGs6-Orbm5Cm__yZsE X-Proofpoint-GUID: NfAgXiN8f7FgSlRGs6-Orbm5Cm__yZsE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 phishscore=0 clxscore=1015 suspectscore=0 spamscore=0 impostorscore=0 bulkscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411180096 X-Spam-Status: No, score=-0.7 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, RCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE, SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org Commit e1f288d2f9c69 ("KVM: PPC: Book3S HV nestedv2: Add support for reading VPA counters for pseries guests") introduced support for new Virtual Process Area(VPA) based software counters. These counters are useful when observing context switch latency of L1 <-> L2. It also added access to counters in lppaca, which is good enough to understand latency details per-cpu level. But to extend and aggregate per-process level(qemu) or per-pid/tid level(vcpu), these counters also needs to be added as part of kvm_vcpu_arch struct. Additional code added to update these new kvm_vcpu_arch variables in do_trace_nested_cs_time function. Signed-off-by: Kajol Jain Co-developed-by: Madhavan Srinivasan Signed-off-by: Madhavan Srinivasan --- arch/powerpc/include/asm/kvm_host.h | 5 +++++ arch/powerpc/kvm/book3s_hv.c | 3 +++ 2 files changed, 8 insertions(+) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 37e581c5b201..6e1108f8fce6 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -871,6 +871,11 @@ struct kvm_vcpu_arch { struct kvmhv_tb_accumulator cede_time; /* time napping inside guest */ #endif #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + u64 l1_to_l2_cs; + u64 l2_to_l1_cs; + u64 l2_runtime_agg; +#endif }; #define VCPU_FPR(vcpu, i) (vcpu)->arch.fp.fpr[i][TS_FPROFFSET] diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index e618533dfc4b..4284437fedeb 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4191,6 +4191,9 @@ static void do_trace_nested_cs_time(struct kvm_vcpu *vcpu) *l1_to_l2_cs_ptr = l1_to_l2_ns; *l2_to_l1_cs_ptr = l2_to_l1_ns; *l2_runtime_agg_ptr = l2_runtime_ns; + vcpu->arch.l1_to_l2_cs = l1_to_l2_ns; + vcpu->arch.l2_to_l1_cs = l2_to_l1_ns; + vcpu->arch.l2_runtime_agg = l2_runtime_ns; } u64 kvmhv_get_l1_to_l2_cs_time(void)