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Re: [PATCH v3 7/8] perf: Define PMU_TXN_READ interface

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On Tue, Jul 14, 2015 at 08:01:54PM -0700, Sukadev Bhattiprolu wrote:
> +/*
> + * Use the transaction interface to read the group of events in @leader.
> + * PMUs like the 24x7 counters in Power, can use this to queue the events
> + * in the ->read() operation and perform the actual read in ->commit_txn.
> + *
> + * Other PMUs can ignore the ->start_txn and ->commit_txn and read each
> + * PMU directly in the ->read() operation.
> + */
> +static int perf_event_read_group(struct perf_event *leader)
> +{
> +	int ret;
> +	struct perf_event *sub;
> +	struct pmu *pmu;
> +
> +	pmu = leader->pmu;
> +
> +	pmu->start_txn(pmu, PERF_PMU_TXN_READ);
> +
> +	perf_event_read(leader);

There should be a lockdep assert with that list iteration.

> +	list_for_each_entry(sub, &leader->sibling_list, group_entry)
> +		perf_event_read(sub);
> +
> +	ret = pmu->commit_txn(pmu);
> +
> +	return ret;
> +}
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[PATCH v3 0/8] Implement group-read of events using txn interface Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
  [PATCH v3 4/8] perf: Split perf_event_read() and perf_event_count() Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
  [PATCH v3 7/8] perf: Define PMU_TXN_READ interface Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
    Re: [PATCH v3 7/8] perf: Define PMU_TXN_READ interface Peter Zijlstra <peterz@infradead.org> - 2015-07-17 00:30 +0200
      Re: [PATCH v3 7/8] perf: Define PMU_TXN_READ interface Peter Zijlstra <peterz@infradead.org> - 2015-07-22 08:00 +0200
  [PATCH v3 3/8] perf: Add a flags parameter to pmu txn interfaces Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
    Re: [PATCH v3 3/8] perf: Add a flags parameter to pmu txn interfaces Peter Zijlstra <peterz@infradead.org> - 2015-07-16 22:20 +0200
      Re: [PATCH v3 3/8] perf: Add a flags parameter to pmu txn interfaces Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-16 23:30 +0200
    Re: [PATCH v3 3/8] perf: Add a flags parameter to pmu txn interfaces Peter Zijlstra <peterz@infradead.org> - 2015-07-16 22:50 +0200
  [PATCH v3 5/8] perf: Split perf_event_read_value() Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
    Re: [PATCH v3 5/8] perf: Split perf_event_read_value() Peter Zijlstra <peterz@infradead.org> - 2015-07-16 23:20 +0200
      Re: [PATCH v3 5/8] perf: Split perf_event_read_value() Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-16 23:50 +0200
  [PATCH v3 1/8] powerpc/perf/hv-24x7: Whitespace - fix parameter alignment Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200
  [PATCH v3 2/8] powerpc/perf/hv-24x7: Simplify extracting counter from result buffer Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> - 2015-07-15 05:10 +0200

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