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Message-Id: <1272002172.5707.61.camel@minggr.sh.intel.com>
Date: Fri, 23 Apr 2010 13:56:12 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
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" <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 v2 2/4] perf: x86, implement group scheduling
transactional APIs
perf: x86, implement group scheduling transactional APIs
Reviewed-by: Stephane Eranian <eranian@...gle.com>
Reviewed-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
arch/x86/kernel/cpu/perf_event.c | 192 ++++++++++++++-----------------------
1 files changed, 73 insertions(+), 119 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 7de7061..d46e797 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -110,6 +110,8 @@ struct cpu_hw_events {
u64 tags[X86_PMC_IDX_MAX];
struct perf_event *event_list[X86_PMC_IDX_MAX]; /* in enabled order */
+ unsigned int group_flag;
+
/*
* Intel DebugStore bits
*/
@@ -944,6 +946,14 @@ static int x86_pmu_enable(struct perf_event *event)
if (n < 0)
return n;
+ /*
+ * If group events scheduling transaction was started,
+ * skip the schedulability test here, it will be peformed
+ * at commit time(->commit_group_trans) as a whole
+ */
+ if (cpuc->group_flag & PERF_EVENT_TRAN_STARTED)
+ goto out;
+
ret = x86_pmu.schedule_events(cpuc, n, assign);
if (ret)
return ret;
@@ -953,6 +963,7 @@ static int x86_pmu_enable(struct perf_event *event)
*/
memcpy(cpuc->assign, assign, n*sizeof(int));
+out:
cpuc->n_events = n;
cpuc->n_added += n - n0;
@@ -1210,119 +1221,6 @@ x86_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
return &unconstrained;
}
-static int x86_event_sched_in(struct perf_event *event,
- struct perf_cpu_context *cpuctx)
-{
- int ret = 0;
-
- event->state = PERF_EVENT_STATE_ACTIVE;
- event->oncpu = smp_processor_id();
- event->tstamp_running += event->ctx->time - event->tstamp_stopped;
-
- if (!is_x86_event(event))
- ret = event->pmu->enable(event);
-
- if (!ret && !is_software_event(event))
- cpuctx->active_oncpu++;
-
- if (!ret && event->attr.exclusive)
- cpuctx->exclusive = 1;
-
- return ret;
-}
-
-static void x86_event_sched_out(struct perf_event *event,
- struct perf_cpu_context *cpuctx)
-{
- event->state = PERF_EVENT_STATE_INACTIVE;
- event->oncpu = -1;
-
- if (!is_x86_event(event))
- event->pmu->disable(event);
-
- event->tstamp_running -= event->ctx->time - event->tstamp_stopped;
-
- if (!is_software_event(event))
- cpuctx->active_oncpu--;
-
- if (event->attr.exclusive || !cpuctx->active_oncpu)
- cpuctx->exclusive = 0;
-}
-
-/*
- * 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.
- *
- * called with PMU disabled. If successful and return value 1,
- * then guaranteed to call perf_enable() and hw_perf_enable()
- */
-int hw_perf_group_sched_in(struct perf_event *leader,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
-{
- struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
- struct perf_event *sub;
- int assign[X86_PMC_IDX_MAX];
- int n0, n1, ret;
-
- if (!x86_pmu_initialized())
- return 0;
-
- /* n0 = total number of events */
- n0 = collect_events(cpuc, leader, true);
- if (n0 < 0)
- return n0;
-
- ret = x86_pmu.schedule_events(cpuc, n0, assign);
- if (ret)
- return ret;
-
- ret = x86_event_sched_in(leader, cpuctx);
- if (ret)
- return ret;
-
- n1 = 1;
- list_for_each_entry(sub, &leader->sibling_list, group_entry) {
- if (sub->state > PERF_EVENT_STATE_OFF) {
- ret = x86_event_sched_in(sub, cpuctx);
- if (ret)
- goto undo;
- ++n1;
- }
- }
- /*
- * copy new assignment, now we know it is possible
- * will be used by hw_perf_enable()
- */
- memcpy(cpuc->assign, assign, n0*sizeof(int));
-
- cpuc->n_events = n0;
- cpuc->n_added += n1;
- ctx->nr_active += n1;
-
- /*
- * 1 means successful and events are active
- * This is not quite true because we defer
- * actual activation until hw_perf_enable() but
- * this way we* ensure caller won't try to enable
- * individual events
- */
- return 1;
-undo:
- x86_event_sched_out(leader, cpuctx);
- n0 = 1;
- list_for_each_entry(sub, &leader->sibling_list, group_entry) {
- if (sub->state == PERF_EVENT_STATE_ACTIVE) {
- x86_event_sched_out(sub, cpuctx);
- if (++n0 == n1)
- break;
- }
- }
- return ret;
-}
-
#include "perf_event_amd.c"
#include "perf_event_p6.c"
#include "perf_event_p4.c"
@@ -1454,13 +1352,69 @@ static inline void x86_pmu_read(struct perf_event *event)
x86_perf_event_update(event);
}
+/*
+ * Start group events scheduling transaction
+ * Set the flag to make pmu::enable() not perform the
+ * schedulability test, it will be performed at commit time
+ */
+static void x86_pmu_start_group_trans(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+
+ cpuc->group_flag |= PERF_EVENT_TRAN_STARTED;
+}
+
+/*
+ * Stop group events scheduling transaction
+ * Clear the flag and pmu::enable() will perform the
+ * schedulability test.
+ */
+static void x86_pmu_stop_group_trans(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+
+ cpuc->group_flag &= ~PERF_EVENT_TRAN_STARTED;
+}
+
+/*
+ * Commit group events scheduling transaction
+ * Perform the group schedulability test as a whole
+ * Return 0 if success
+ */
+static int x86_pmu_commit_group_trans(const struct pmu *pmu)
+{
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ int assign[X86_PMC_IDX_MAX];
+ int n, ret;
+
+ n = cpuc->n_events;
+
+ if (!x86_pmu_initialized())
+ return -EAGAIN;
+
+ ret = x86_pmu.schedule_events(cpuc, n, assign);
+ if (ret)
+ return ret;
+
+ /*
+ * copy new assignment, now we know it is possible
+ * will be used by hw_perf_enable()
+ */
+ memcpy(cpuc->assign, assign, n*sizeof(int));
+
+ return 0;
+}
+
static const struct pmu pmu = {
- .enable = x86_pmu_enable,
- .disable = x86_pmu_disable,
- .start = x86_pmu_start,
- .stop = x86_pmu_stop,
- .read = x86_pmu_read,
- .unthrottle = x86_pmu_unthrottle,
+ .enable = x86_pmu_enable,
+ .disable = x86_pmu_disable,
+ .start = x86_pmu_start,
+ .stop = x86_pmu_stop,
+ .read = x86_pmu_read,
+ .unthrottle = x86_pmu_unthrottle,
+ .start_group_trans = x86_pmu_start_group_trans,
+ .stop_group_trans = x86_pmu_stop_group_trans,
+ .commit_group_trans = x86_pmu_commit_group_trans,
};
/*
--
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