summaryrefslogtreecommitdiffstats
path: root/kernel
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2010-01-18 08:56:41 +0100
committerIngo Molnar <mingo@elte.hu>2010-01-18 08:56:41 +0100
commitf426a7e02918e2e992b28adeb02e5a0ab39a7a25 (patch)
tree40047bb25f52bdf3138a9dea399ef82894c880ed /kernel
parent231e36f4d2e63dd770db80b9f5113310c2bcfcfd (diff)
parent329c0e012b99fa2325a0be205c052e4aba690f16 (diff)
downloadop-kernel-dev-f426a7e02918e2e992b28adeb02e5a0ab39a7a25.zip
op-kernel-dev-f426a7e02918e2e992b28adeb02e5a0ab39a7a25.tar.gz
Merge branch 'perf/scheduling' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/core
Diffstat (limited to 'kernel')
-rw-r--r--kernel/perf_event.c149
1 files changed, 109 insertions, 40 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index eae6ff6..edc46b9 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1049,8 +1049,15 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
return 0;
}
-void __perf_event_sched_out(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx)
+enum event_type_t {
+ EVENT_FLEXIBLE = 0x1,
+ EVENT_PINNED = 0x2,
+ EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED,
+};
+
+static void ctx_sched_out(struct perf_event_context *ctx,
+ struct perf_cpu_context *cpuctx,
+ enum event_type_t event_type)
{
struct perf_event *event;
@@ -1061,13 +1068,18 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
update_context_time(ctx);
perf_disable();
- if (ctx->nr_active) {
+ if (!ctx->nr_active)
+ goto out_enable;
+
+ if (event_type & EVENT_PINNED)
list_for_each_entry(event, &ctx->pinned_groups, group_entry)
group_sched_out(event, cpuctx, ctx);
+ if (event_type & EVENT_FLEXIBLE)
list_for_each_entry(event, &ctx->flexible_groups, group_entry)
group_sched_out(event, cpuctx, ctx);
- }
+
+ out_enable:
perf_enable();
out:
raw_spin_unlock(&ctx->lock);
@@ -1229,15 +1241,13 @@ void perf_event_task_sched_out(struct task_struct *task,
rcu_read_unlock();
if (do_switch) {
- __perf_event_sched_out(ctx, cpuctx);
+ ctx_sched_out(ctx, cpuctx, EVENT_ALL);
cpuctx->task_ctx = NULL;
}
}
-/*
- * Called with IRQs disabled
- */
-static void __perf_event_task_sched_out(struct perf_event_context *ctx)
+static void task_ctx_sched_out(struct perf_event_context *ctx,
+ enum event_type_t event_type)
{
struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
@@ -1247,39 +1257,34 @@ static void __perf_event_task_sched_out(struct perf_event_context *ctx)
if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
return;
- __perf_event_sched_out(ctx, cpuctx);
+ ctx_sched_out(ctx, cpuctx, event_type);
cpuctx->task_ctx = NULL;
}
/*
* Called with IRQs disabled
*/
-static void perf_event_cpu_sched_out(struct perf_cpu_context *cpuctx)
+static void __perf_event_task_sched_out(struct perf_event_context *ctx)
{
- __perf_event_sched_out(&cpuctx->ctx, cpuctx);
+ task_ctx_sched_out(ctx, EVENT_ALL);
+}
+
+/*
+ * Called with IRQs disabled
+ */
+static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
+ enum event_type_t event_type)
+{
+ ctx_sched_out(&cpuctx->ctx, cpuctx, event_type);
}
static void
-__perf_event_sched_in(struct perf_event_context *ctx,
- struct perf_cpu_context *cpuctx)
+ctx_pinned_sched_in(struct perf_event_context *ctx,
+ struct perf_cpu_context *cpuctx,
+ int cpu)
{
- int cpu = smp_processor_id();
struct perf_event *event;
- int can_add_hw = 1;
- raw_spin_lock(&ctx->lock);
- ctx->is_active = 1;
- if (likely(!ctx->nr_events))
- goto out;
-
- ctx->timestamp = perf_clock();
-
- perf_disable();
-
- /*
- * First go through the list and put on any pinned groups
- * in order to give them the best chance of going on.
- */
list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
if (event->state <= PERF_EVENT_STATE_OFF)
continue;
@@ -1298,6 +1303,15 @@ __perf_event_sched_in(struct perf_event_context *ctx,
event->state = PERF_EVENT_STATE_ERROR;
}
}
+}
+
+static void
+ctx_flexible_sched_in(struct perf_event_context *ctx,
+ struct perf_cpu_context *cpuctx,
+ int cpu)
+{
+ struct perf_event *event;
+ int can_add_hw = 1;
list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
/* Ignore events in OFF or ERROR state */
@@ -1314,11 +1328,61 @@ __perf_event_sched_in(struct perf_event_context *ctx,
if (group_sched_in(event, cpuctx, ctx, cpu))
can_add_hw = 0;
}
+}
+
+static void
+ctx_sched_in(struct perf_event_context *ctx,
+ struct perf_cpu_context *cpuctx,
+ enum event_type_t event_type)
+{
+ int cpu = smp_processor_id();
+
+ raw_spin_lock(&ctx->lock);
+ ctx->is_active = 1;
+ if (likely(!ctx->nr_events))
+ goto out;
+
+ ctx->timestamp = perf_clock();
+
+ perf_disable();
+
+ /*
+ * First go through the list and put on any pinned groups
+ * in order to give them the best chance of going on.
+ */
+ if (event_type & EVENT_PINNED)
+ ctx_pinned_sched_in(ctx, cpuctx, cpu);
+
+ /* Then walk through the lower prio flexible groups */
+ if (event_type & EVENT_FLEXIBLE)
+ ctx_flexible_sched_in(ctx, cpuctx, cpu);
+
perf_enable();
out:
raw_spin_unlock(&ctx->lock);
}
+static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
+ enum event_type_t event_type)
+{
+ struct perf_event_context *ctx = &cpuctx->ctx;
+
+ ctx_sched_in(ctx, cpuctx, event_type);
+}
+
+static void task_ctx_sched_in(struct task_struct *task,
+ enum event_type_t event_type)
+{
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+ struct perf_event_context *ctx = task->perf_event_ctxp;
+
+ if (likely(!ctx))
+ return;
+ if (cpuctx->task_ctx == ctx)
+ return;
+ ctx_sched_in(ctx, cpuctx, event_type);
+ cpuctx->task_ctx = ctx;
+}
/*
* Called from scheduler to add the events of the current task
* with interrupts disabled.
@@ -1337,17 +1401,22 @@ void perf_event_task_sched_in(struct task_struct *task)
if (likely(!ctx))
return;
+
if (cpuctx->task_ctx == ctx)
return;
- __perf_event_sched_in(ctx, cpuctx);
- cpuctx->task_ctx = ctx;
-}
-static void perf_event_cpu_sched_in(struct perf_cpu_context *cpuctx)
-{
- struct perf_event_context *ctx = &cpuctx->ctx;
+ /*
+ * We want to keep the following priority order:
+ * cpu pinned (that don't need to move), task pinned,
+ * cpu flexible, task flexible.
+ */
+ cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
- __perf_event_sched_in(ctx, cpuctx);
+ ctx_sched_in(ctx, cpuctx, EVENT_PINNED);
+ cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
+ ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
+
+ cpuctx->task_ctx = ctx;
}
#define MAX_INTERRUPTS (~0ULL)
@@ -1476,17 +1545,17 @@ void perf_event_task_tick(struct task_struct *curr)
if (ctx)
perf_ctx_adjust_freq(ctx);
- perf_event_cpu_sched_out(cpuctx);
+ cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
if (ctx)
- __perf_event_task_sched_out(ctx);
+ task_ctx_sched_out(ctx, EVENT_FLEXIBLE);
rotate_ctx(&cpuctx->ctx);
if (ctx)
rotate_ctx(ctx);
- perf_event_cpu_sched_in(cpuctx);
+ cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
if (ctx)
- perf_event_task_sched_in(curr);
+ task_ctx_sched_in(curr, EVENT_FLEXIBLE);
}
static int event_enable_on_exec(struct perf_event *event,
OpenPOWER on IntegriCloud