July 2021 - Linaro-open-discussions

[RFC Patch v2 0/4] Add run time sysctl to enable/disable cluster scheduling

by Tim Chen

Barry & Yicong, I've updated the patchset per review comments from Yicong. Will appreciate your feedback, testing and review. v2: 1. Fix incorrect prototype for set_sched_cluster 2. Add patch to allow boot time parameter to enable/disable cluster scheduling Tim Tim Chen (4): sched: Create SDTL_SKIP flag to skip topology level sched: Add SD_CLUSTER topology flag to cluster sched domain sched: Add runtime knob sysctl_sched_cluster_enabled sched: Add boot time enabling/disabling of cluster scheduling .../admin-guide/kernel-parameters.txt | 4 ++ arch/x86/kernel/smpboot.c | 8 +++ drivers/base/arch_topology.c | 7 ++ include/linux/sched/sd_flags.h | 7 ++ include/linux/sched/sysctl.h | 6 ++ include/linux/sched/topology.h | 3 +- include/linux/topology.h | 1 + kernel/sched/core.c | 1 + kernel/sched/sched.h | 6 ++ kernel/sched/topology.c | 71 ++++++++++++++++++- kernel/sysctl.c | 11 +++ 11 files changed, 123 insertions(+), 2 deletions(-) -- 2.20.1

2 years, 8 months

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lvc21-305 demo details

by Lorenzo Pieralisi

Hi, as agreed in the LOD call today I asked Arunachalam to share his demo set-up guidelines following his demo at LVC: https://connect.linaro.org/resources/lvc21/lvc21-305/ He agreed to share the FVP based set-up - so that it can be reused/refactored with QEmu by Huawei developers who are interested. For any questions/query let's use this public thread. Thank you very much. Lorenzo

2 years, 8 months

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Re: [Linaro-open-discussions] Meeting on July 23rd

by Jammy Zhou

Hi all, The notes have been published on the meeting page below together with the slides and video. Thanks Alex and Jonathan for the great presentations. https://linaro.atlassian.net/wiki/spaces/LOD/pages/28544303418/2021-07-23+M… Regards, Jammy On Wed, 21 Jul 2021 at 23:16, Jammy Zhou via Linaro-open-discussions < linaro-open-discussions(a)op-lists.linaro.org> wrote: > Hi all, > > Just a kind reminder that the LOD meeting in July has been rescheduled to > 23rd, Friday this week. > > In this meeting, we will have a good topic from Alex Bennée to > introduce QEMU 6.1 and future work. > > Please let me know if you have any other topics. > > Thanks, > Jammy > -- > Linaro-open-discussions mailing list > https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home > https://op-lists.linaro.org/mailman/listinfo/linaro-open-discussions >

2 years, 8 months

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Re: [Linaro-open-discussions] [PATCH 1/4] sched: Add infrastructure to describe if cluster scheduler is really running

by Tim Chen

On 7/22/21 1:37 PM, Song Bao Hua (Barry Song) wrote: > Regarding squashing scheduler level, what you say is true. However, > as long as we are changing code based on if(sched_cluster_present) > in wake_affine path, we need to care about this. I'm wondering if we can use SD_CLUSTER flag I introduced in my patch 2 sent yesterday to determine if we have a cluster sched domain instead of sched_cluster_present? So if we squash the cluster sched domain we'll skip the logic for the sched domain, instead of having a global flag. > >> If the CLS domain equals the MC domain, finally the CLS will stay and >> MC will be destroyed. Nothing need to do then. If the CLS domain equals >> the SMT domain, SMT will stay and we need to modify the >> @sched_cluster_present then. But I doubt whether there is a real case >> than CLS will be the same as SMT. > > It doesn't matter if there is a real hardware. What does matter is > how the topology patch(patch 1) will parse ACPI table and whether > ACPI has a particular flag for cluster. > > Thanks > Barry >

2 years, 9 months

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[PATCH 0/3] Add run time sysctl to enable/disable cluster scheduling

by Tim Chen

Barry & Yicong, I've added this series to allow for run time control of cluster scheduling via /proc/sys/kernel/sched_cluster_enabled. I've defaulted the setting to off as this is probably the safest option and will encounter the least resistance. I've also added a SD_CLUSTER flag in patch 2. It may be handy if we want to do any cluster specific scheduling operation in a cluster sched domain. This could be a follow on after the main patchset is posted. I've tested it on my x86 machine. Wonder if you can test it on your ARM system to make sure it works properly there. Will appreciate your feedback and review. Tim Tim Chen (3): sched: Create SDTL_SKIP flag to skip topology level sched: Add SD_CLUSTER topology flag to cluster sched domain sched: Add runtime knob sysctl_sched_cluster_enabled arch/x86/kernel/smpboot.c | 8 +++++ drivers/base/arch_topology.c | 7 ++++ include/linux/sched/sd_flags.h | 7 ++++ include/linux/sched/sysctl.h | 6 ++++ include/linux/sched/topology.h | 3 +- include/linux/topology.h | 7 ++++ kernel/sched/core.c | 1 + kernel/sched/sched.h | 6 ++++ kernel/sched/topology.c | 58 +++++++++++++++++++++++++++++++++- kernel/sysctl.c | 11 +++++++ 10 files changed, 112 insertions(+), 2 deletions(-) -- 2.20.1

2 years, 9 months

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LOC Monthly Meeting - Thursday July 22

by Ruchika Gupta

Hi, LOC (Linaro OP-TEE Contribution) monthly meeting is planned to take place on Thursday July22(a)17.00 (UTC+2). Looking for topics from people. If you have anything you'd like to discuss, please let us know. Meeting details: --------------- Date/time: Thursday Jul22(a)17.00 (UTC+2) https://everytimezone.com/s/d926310d Connection details: https://www.trustedfirmware.org/meetings/ Meeting notes: http://bit.ly/loc-notes Regards, Ruchika on behalf of the Linaro OP-TEE team

2 years, 9 months

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Meeting on July 23rd

by Jammy Zhou

Hi all, Just a kind reminder that the LOD meeting in July has been rescheduled to 23rd, Friday this week. In this meeting, we will have a good topic from Alex Bennée to introduce QEMU 6.1 and future work. Please let me know if you have any other topics. Thanks, Jammy

2 years, 9 months

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Re: [Linaro-open-discussions] LOD Meeting Agenda for June 28

by Lorenzo Pieralisi

On Tue, Jul 06, 2021 at 02:21:16PM +0000, Lorenzo Pieralisi via Linaro-open-discussions wrote: > On Wed, Jun 23, 2021 at 01:10:52PM +0000, Jonathan Cameron via Linaro-open-discussions wrote: > > On Tue, 22 Jun 2021 12:17:33 +0000 > > Jonathan Cameron via Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org> wrote: > > > > > On Tue, 22 Jun 2021 09:39:15 +0000 > > > Lorenzo Pieralisi via Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org> wrote: > > > > > > > On Mon, Jun 21, 2021 at 09:33:42PM +0000, Song Bao Hua (Barry Song) wrote: > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > From: Linaro-open-discussions > > > > > > [mailto:linaro-open-discussions-bounces@op-lists.linaro.org] On Behalf Of > > > > > > Lorenzo Pieralisi via Linaro-open-discussions > > > > > > Sent: Monday, June 21, 2021 9:32 PM > > > > > > To: Jammy Zhou <jammy.zhou(a)linaro.org> > > > > > > Cc: Lorenzo Pieralisi via Linaro-open-discussions > > > > > > <linaro-open-discussions(a)op-lists.linaro.org> > > > > > > Subject: Re: [Linaro-open-discussions] LOD Meeting Agenda for June 28 > > > > > > > > > > > > On Mon, Jun 21, 2021 at 12:37:03AM +0000, Jammy Zhou via Linaro-open-discussions > > > > > > wrote: > > > > > > > Hi all, > > > > > > > > > > > > > > We are only one week away from the next LOD meeting on June 28. If you > > > > > > > have any topic to discuss, please let me know. > > > > > > > > > > > > We could discuss the virt CPU hotplug status/forward plan. > > > > > > > > > > > > I don't know if Barry's scheduler discussion can benefit from an LOD > > > > > > session, please chime in if that's the case. > > > > > > > > > > Hi Lorenzo, > > > > > Thanks for asking. I have no important updates at this time. That > > > > > discussion is mainly for co-working with Tim Chen on the plan of > > > > > upstreaming and benchmarking, also figuring out whether the patches > > > > > are leading to the same result on arm and x86 platforms. > > > > > > > > > > > > > > > > > AOB ? > > > > > > > > Ok. So, anything else to discuss other than the PSCI KVM patches > > > > that are currently on ML ? Jonathan, Salil, anyone please do let > > > > me know. > > > > > > > > > > On the near term horizon is the confidential compute stuff that there > > > is an event about tomorrow, but next week feels a little early to try > > > and have a detailed discussion about that (I assume)? > > > > > > A few other things will surface by next month, but not next week ;) > > > > > > Otherwise, nothing immediate jumps out to me, beyond any useful > > > discussion that can be had around the PSCI KVM patches you mention. > > > > > > Thanks, > > > > > > Jonathan > > > > > > > Leaving that one aside, it seems the main open question from our side > > is around planning / progress on steps for the vCPU hotplug. > > > > Perhaps that's something best formulated over email... > > > > My current understanding is that next item would be the Guest Kernel > > changes? Perhaps a good target for sending out an RFC on that would > > be just after the merge window? > > I am afraid we will have to rework the approach and implement this > through ACPI only (kernel/spec changes) which is both good and bad news. > > I am focusing on getting the ACPI specs agreed/changed in the Arm world, > it will take me a while, hopefully I can expedite, that's all I can > share here. Next week I should be able to let you know what we are pursuing going forward, it is just to let you know that we are working on it to converge as soon as possible. The end result should not be massively different from Salil's initial work but there are lots of details we are vetting to make sure it is rock solid (and that everyone in the ARM world is happy with it, again, I can't share the fine grain details here). Have a good week end, Lorenzo

2 years, 9 months

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Propose QEMU 6.1 and future work as a topic for LOD sync-up on 26th July

by Alex Bennée

Hi, The QEMU project will have tagged rc0 on the 20th so we will know with a fair bit of certainty the features that will make it into 6.1. We'll also be transitioning from our Connect->Connect 6 month planning cycle to the upstream aligned planning. There will be one more QEMU release this year which will be 6.2. I propose to present the following: - what made it into 6.1 - what we are aiming to get into 6.2 - what we are thinking about next There have been some fairly big ARM features announced recently so I'd like to cover the teams initial thoughts about what would be needed to successfully upstream things like CCA and SME. It's intended to be a collaborative call so please come with questions and discussion points. We are a small team so we aim to be a force multiplier for collaboration ;-) -- Alex Bennée

2 years, 9 months

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Re: [Linaro-open-discussions] LOD Meeting Agenda for June 28

by Lorenzo Pieralisi

On Wed, Jun 23, 2021 at 01:10:52PM +0000, Jonathan Cameron via Linaro-open-discussions wrote: > On Tue, 22 Jun 2021 12:17:33 +0000 > Jonathan Cameron via Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org> wrote: > > > On Tue, 22 Jun 2021 09:39:15 +0000 > > Lorenzo Pieralisi via Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org> wrote: > > > > > On Mon, Jun 21, 2021 at 09:33:42PM +0000, Song Bao Hua (Barry Song) wrote: > > > > > > > > > > > > > -----Original Message----- > > > > > From: Linaro-open-discussions > > > > > [mailto:linaro-open-discussions-bounces@op-lists.linaro.org] On Behalf Of > > > > > Lorenzo Pieralisi via Linaro-open-discussions > > > > > Sent: Monday, June 21, 2021 9:32 PM > > > > > To: Jammy Zhou <jammy.zhou(a)linaro.org> > > > > > Cc: Lorenzo Pieralisi via Linaro-open-discussions > > > > > <linaro-open-discussions(a)op-lists.linaro.org> > > > > > Subject: Re: [Linaro-open-discussions] LOD Meeting Agenda for June 28 > > > > > > > > > > On Mon, Jun 21, 2021 at 12:37:03AM +0000, Jammy Zhou via Linaro-open-discussions > > > > > wrote: > > > > > > Hi all, > > > > > > > > > > > > We are only one week away from the next LOD meeting on June 28. If you > > > > > > have any topic to discuss, please let me know. > > > > > > > > > > We could discuss the virt CPU hotplug status/forward plan. > > > > > > > > > > I don't know if Barry's scheduler discussion can benefit from an LOD > > > > > session, please chime in if that's the case. > > > > > > > > Hi Lorenzo, > > > > Thanks for asking. I have no important updates at this time. That > > > > discussion is mainly for co-working with Tim Chen on the plan of > > > > upstreaming and benchmarking, also figuring out whether the patches > > > > are leading to the same result on arm and x86 platforms. > > > > > > > > > > > > > > AOB ? > > > > > > Ok. So, anything else to discuss other than the PSCI KVM patches > > > that are currently on ML ? Jonathan, Salil, anyone please do let > > > me know. > > > > > > > On the near term horizon is the confidential compute stuff that there > > is an event about tomorrow, but next week feels a little early to try > > and have a detailed discussion about that (I assume)? > > > > A few other things will surface by next month, but not next week ;) > > > > Otherwise, nothing immediate jumps out to me, beyond any useful > > discussion that can be had around the PSCI KVM patches you mention. > > > > Thanks, > > > > Jonathan > > > > Leaving that one aside, it seems the main open question from our side > is around planning / progress on steps for the vCPU hotplug. > > Perhaps that's something best formulated over email... > > My current understanding is that next item would be the Guest Kernel > changes? Perhaps a good target for sending out an RFC on that would > be just after the merge window? I am afraid we will have to rework the approach and implement this through ACPI only (kernel/spec changes) which is both good and bad news. I am focusing on getting the ACPI specs agreed/changed in the Arm world, it will take me a while, hopefully I can expedite, that's all I can share here. Lorenzo

2 years, 9 months

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Linaro-open-discussions July 2021