From: Peter Zijlstra <peterz@infradead•org>
To: Sukadev Bhattiprolu <sukadev@linux•vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat•com>,
Arnaldo Carvalho de Melo <acme@kernel•org>,
Michael Ellerman <mpe@ellerman•id.au>,
linux-kernel@vger•kernel.org, linuxppc-dev@lists•ozlabs.org,
linux-s390@vger•kernel.org, sparclinux@vger•kernel.org
Subject: Re: [PATCH v3 7/8] perf: Define PMU_TXN_READ interface
Date: Fri, 17 Jul 2015 00:20:15 +0200 [thread overview]
Message-ID: <20150716222015.GO3644@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1436929315-28520-8-git-send-email-sukadev@linux.vnet.ibm.com>
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;
> +}
next prev parent reply other threads:[~2015-07-16 22:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 3:01 [PATCH v3 0/8] Implement group-read of events using txn interface Sukadev Bhattiprolu
2015-07-15 3:01 ` [PATCH v3 1/8] powerpc/perf/hv-24x7: Whitespace - fix parameter alignment Sukadev Bhattiprolu
2015-08-03 1:35 ` [v3, " Michael Ellerman
2015-07-15 3:01 ` [PATCH v3 2/8] powerpc/perf/hv-24x7: Simplify extracting counter from result buffer Sukadev Bhattiprolu
2015-08-03 1:35 ` [v3, " Michael Ellerman
2015-07-15 3:01 ` [PATCH v3 3/8] perf: Add a flags parameter to pmu txn interfaces Sukadev Bhattiprolu
2015-07-16 20:17 ` Peter Zijlstra
2015-07-16 21:28 ` Sukadev Bhattiprolu
2015-07-16 20:48 ` Peter Zijlstra
2015-07-15 3:01 ` [PATCH v3 4/8] perf: Split perf_event_read() and perf_event_count() Sukadev Bhattiprolu
2015-07-15 3:01 ` [PATCH v3 5/8] perf: Split perf_event_read_value() Sukadev Bhattiprolu
2015-07-16 21:12 ` Peter Zijlstra
2015-07-16 21:41 ` Sukadev Bhattiprolu
2015-07-23 7:45 ` Peter Zijlstra
2015-07-27 5:54 ` Sukadev Bhattiprolu
2015-07-15 3:01 ` [PATCH v3 6/8] perf: Rename perf_event_read_{one, group}, perf_read_hw Sukadev Bhattiprolu
2015-07-15 3:01 ` [PATCH v3 7/8] perf: Define PMU_TXN_READ interface Sukadev Bhattiprolu
2015-07-16 22:20 ` Peter Zijlstra [this message]
2015-07-22 1:50 ` Sukadev Bhattiprolu
2015-07-22 5:55 ` Peter Zijlstra
2015-07-22 23:19 ` Sukadev Bhattiprolu
2015-07-23 8:04 ` Peter Zijlstra
2015-07-24 1:17 ` Sukadev Bhattiprolu
2015-07-15 3:01 ` [PATCH v3 8/8] powerpc/perf/hv-24x7: Use " Sukadev Bhattiprolu
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