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Date: Thu, 22 Apr 2010 15:51:15 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
"eranian@...il.com" <eranian@...il.com>,
"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
arjan@...ux.intel.com,
"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
Paul Mackerras <paulus@...ba.org>,
"David S. Miller" <davem@...emloft.net>
Cc: lkml <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH 3/4] perf: powerpc, implement group scheduling
transactional APIs
perf: powerpc, implement group scheduling transactional APIs
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
arch/powerpc/kernel/perf_event.c | 109 +++++++++++++++++---------------------
1 files changed, 49 insertions(+), 60 deletions(-)
diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index 08460a2..06c9fb0 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -35,6 +35,8 @@ struct cpu_hw_events {
u64 alternatives[MAX_HWEVENTS][MAX_EVENT_ALTERNATIVES];
unsigned long amasks[MAX_HWEVENTS][MAX_EVENT_ALTERNATIVES];
unsigned long avalues[MAX_HWEVENTS][MAX_EVENT_ALTERNATIVES];
+
+ u8 group_flag;
};
DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events);
@@ -718,66 +720,6 @@ static int collect_events(struct perf_event *group, int max_count,
return n;
}
-static void event_sched_in(struct perf_event *event)
-{
- event->state = PERF_EVENT_STATE_ACTIVE;
- event->oncpu = smp_processor_id();
- event->tstamp_running += event->ctx->time - event->tstamp_stopped;
- if (is_software_event(event))
- event->pmu->enable(event);
-}
-
-/*
- * Called to enable a whole group of events.
- * Returns 1 if the group was enabled, or -EAGAIN if it could not be.
- * Assumes the caller has disabled interrupts and has
- * frozen the PMU with hw_perf_save_disable.
- */
-int hw_perf_group_sched_in(struct perf_event *group_leader,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
-{
- struct cpu_hw_events *cpuhw;
- long i, n, n0;
- struct perf_event *sub;
-
- if (!ppmu)
- return 0;
- cpuhw = &__get_cpu_var(cpu_hw_events);
- n0 = cpuhw->n_events;
- n = collect_events(group_leader, ppmu->n_counter - n0,
- &cpuhw->event[n0], &cpuhw->events[n0],
- &cpuhw->flags[n0]);
- if (n < 0)
- return -EAGAIN;
- if (check_excludes(cpuhw->event, cpuhw->flags, n0, n))
- return -EAGAIN;
- i = power_check_constraints(cpuhw, cpuhw->events, cpuhw->flags, n + n0);
- if (i < 0)
- return -EAGAIN;
- cpuhw->n_events = n0 + n;
- cpuhw->n_added += n;
-
- /*
- * OK, this group can go on; update event states etc.,
- * and enable any software events
- */
- for (i = n0; i < n0 + n; ++i)
- cpuhw->event[i]->hw.config = cpuhw->events[i];
- cpuctx->active_oncpu += n;
- n = 1;
- event_sched_in(group_leader);
- list_for_each_entry(sub, &group_leader->sibling_list, group_entry) {
- if (sub->state != PERF_EVENT_STATE_OFF) {
- event_sched_in(sub);
- ++n;
- }
- }
- ctx->nr_active += n;
-
- return 1;
-}
-
/*
* Add a event to the PMU.
* If all events are not already frozen, then we disable and
@@ -805,11 +747,16 @@ static int power_pmu_enable(struct perf_event *event)
cpuhw->event[n0] = event;
cpuhw->events[n0] = event->hw.config;
cpuhw->flags[n0] = event->hw.event_base;
+
+ if (cpuhw->group_flag & PERF_EVENT_TRAN_STARTED)
+ goto nocheck;
+
if (check_excludes(cpuhw->event, cpuhw->flags, n0, 1))
goto out;
if (power_check_constraints(cpuhw, cpuhw->events, cpuhw->flags, n0 + 1))
goto out;
+nocheck:
event->hw.config = cpuhw->events[n0];
++cpuhw->n_events;
++cpuhw->n_added;
@@ -896,11 +843,53 @@ static void power_pmu_unthrottle(struct perf_event *event)
local_irq_restore(flags);
}
+/*
+ * Set the flag to make pmu::enable() not perform the
+ * schedulablilty test.
+ */
+void power_pmu_start_txn(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
+
+ cpuhw->group_flag |= PERF_EVENT_TRAN_STARTED;
+}
+
+void power_pmu_stop_txn(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
+
+ cpuhw->group_flag &= ~PERF_EVENT_TRAN_STARTED;
+}
+
+/*
+ * Return 0 if commit transaction success
+ */
+int power_pmu_commit_txn(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuhw;
+ long i, n;
+
+ if (!ppmu)
+ return -EAGAIN;
+ cpuhw = &__get_cpu_var(cpu_hw_events);
+ n = cpuhw->n_events;
+ if (check_excludes(cpuhw->event, cpuhw->flags, 0, n))
+ return -EAGAIN;
+ i = power_check_constraints(cpuhw, cpuhw->events, cpuhw->flags, n);
+ if (i < 0)
+ return -EAGAIN;
+
+ return 0;
+}
+
struct pmu power_pmu = {
.enable = power_pmu_enable,
.disable = power_pmu_disable,
.read = power_pmu_read,
.unthrottle = power_pmu_unthrottle,
+ .start_txn = power_pmu_start_txn,
+ .stop_txn = power_pmu_stop_txn,
+ .commit_txn = power_pmu_commit_txn,
};
/*
--
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