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Groups > linux.kernel > #1402299
| From | Juergen Gross <kernel@pfupf.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v5 0/6] Support calling functions on dedicated physical cpu |
| Date | 2016-05-17 13:30 +0200 |
| Message-ID | <rzLmi-3UX-33@gated-at.bofh.it> (permalink) |
| References | <rkWtk-56i-31@gated-at.bofh.it> <rnoEP-6Uh-33@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 13/04/16 10:49, Juergen Gross wrote: > On 06/04/16 16:17, Juergen Gross wrote: >> Some hardware (e.g. Dell Studio laptops) require special functions to >> be called on physical cpu 0 in order to avoid occasional hangs. When >> running as dom0 under Xen this could be achieved only via special boot >> parameters (vcpu pinning) limiting the hypervisor in it's scheduling >> decisions. >> >> This patch series is adding a generic function to be able to temporarily >> pin a (virtual) cpu to a dedicated physical cpu for executing above >> mentioned functions on that specific cpu. The drivers (dcdbas and i8k) >> requiring this functionality are modified accordingly. >> >> Changes in V5: >> - patch 3: rename and reshuffle parameters of smp_call_on_cpu() as requested >> by Peter Zijlstra >> - patch 3: test target cpu to be online as requested by Peter Zijlstra >> - patch 4: less wordy messages as requested by David Vrabel >> >> Changes in V4: >> - move patches 5 and 6 further up in the series >> - patch 2 (was 5): WARN_ONCE in case platform doesn't support pinning >> as requested by Peter Zijlstra >> - patch 3 (was 2): change return value in case of illegal cpu as >> requested by Peter Zijlstra >> - patch 3 (was 2): make pinning of vcpu an option as suggested by >> Peter Zijlstra >> - patches 5 and 6 (were 3 and 4): add call to get_online_cpus() >> >> Changes in V3: >> - use get_cpu()/put_cpu() as suggested by David Vrabel >> >> Changes in V2: >> - instead of manipulating the allowed set of cpus use cpu specific >> workqueue as requested by Peter Zijlstra >> - add include/linux/hypervisor.h to hide architecture specific stuff >> from generic kernel code >> >> Juergen Gross (6): >> xen: sync xen header >> virt, sched: add generic vcpu pinning support >> smp: add function to execute a function synchronously on a cpu >> xen: add xen_pin_vcpu() to support calling functions on a dedicated >> pcpu >> dcdbas: make use of smp_call_on_cpu() >> hwmon: use smp_call_on_cpu() for dell-smm i8k >> >> MAINTAINERS | 1 + >> arch/x86/include/asm/hypervisor.h | 4 ++ >> arch/x86/kernel/cpu/hypervisor.c | 11 +++++ >> arch/x86/xen/enlighten.c | 40 +++++++++++++++ >> drivers/firmware/dcdbas.c | 51 +++++++++---------- >> drivers/hwmon/dell-smm-hwmon.c | 35 +++++++------ >> include/linux/hypervisor.h | 17 +++++++ >> include/linux/smp.h | 3 ++ >> include/xen/interface/sched.h | 100 +++++++++++++++++++++++++++++++------- >> kernel/smp.c | 51 +++++++++++++++++++ >> kernel/up.c | 18 +++++++ >> 11 files changed, 273 insertions(+), 58 deletions(-) >> create mode 100644 include/linux/hypervisor.h >> > > So patches 1, 3 and 4 are acked. Any comments regarding patches 2, 5 > and 6? Patch 6 gained another Ack. What about 2 and 5? Juergen
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Re: [PATCH v5 0/6] Support calling functions on dedicated physical cpu Juergen Gross <kernel@pfupf.net> - 2016-05-17 13:30 +0200
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