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Groups > linux.kernel > #1168262
| From | Dave Hansen <dave.hansen@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v1 2/2] x86, perf,cqm: handle CPU hotplug |
| Date | 2015-06-18 22:10 +0200 |
| Message-ID | <pCOim-1Z7-5@gated-at.bofh.it> (permalink) |
| References | <pCN2W-8tp-19@gated-at.bofh.it> <pCNZ0-1nf-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 06/18/2015 12:47 PM, Thomas Gleixner wrote: >> > @@ -1239,12 +1239,15 @@ static inline void cqm_pick_event_reader(int cpu) >> > int phys_id = topology_physical_package_id(cpu); >> > int i; >> > >> > + mutex_lock(&cache_mutex); > I already explained it to Vikas. You CANNOT take a mutex in that code > path as it runs with interrupts disabled on a CPU which cannot > schedule. How did lockdep not blow up and scream about this? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH v1 2/2] x86, perf,cqm: handle CPU hotplug Thomas Gleixner <tglx@linutronix.de> - 2015-06-18 21:50 +0200
Re: [PATCH v1 2/2] x86, perf,cqm: handle CPU hotplug Dave Hansen <dave.hansen@linux.intel.com> - 2015-06-18 22:10 +0200
Re: [PATCH v1 2/2] x86, perf,cqm: handle CPU hotplug Thomas Gleixner <tglx@linutronix.de> - 2015-06-18 22:10 +0200
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