One target of the switch to the kthread iterant API is to make
most kthreads cleanly freezable.
This patch adds try_to_freeze() where appropriate and enables
freezing.
Signed-off-by: Petr Mladek <pmla...@suse.cz>
---
kernel/trace/ring_buffer_benchmark.c | 34 ++++++++++++++--------------------
1 file changed, 14 insertions(+), 20 deletions(-)
diff --git a/kernel/trace/ring_buffer_benchmark.c
b/kernel/trace/ring_buffer_benchmark.c
index 164f3762cc82..2d276b892aea 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -6,6 +6,7 @@
#include <linux/ring_buffer.h>
#include <linux/completion.h>
#include <linux/kthread.h>
+#include <linux/freezer.h>
#include <linux/module.h>
#include <linux/ktime.h>
#include <asm/local.h>
@@ -207,6 +208,7 @@ static void ring_buffer_consumer(void)
break;
schedule();
+ try_to_freeze();
}
reader_finish = 0;
complete(&read_done);
@@ -252,19 +254,21 @@ static void ring_buffer_producer(void)
if (consumer && !(cnt % wakeup_interval))
wake_up_process(consumer);
+ if (cnt % wakeup_interval) {
#ifndef CONFIG_PREEMPT
- /*
- * If we are a non preempt kernel, the 10 second run will
- * stop everything while it runs. Instead, we will call
- * cond_resched and also add any time that was lost by a
- * rescedule.
- *
- * Do a cond resched at the same frequency we would wake up
- * the reader.
- */
- if (cnt % wakeup_interval)
+ /*
+ * If we are a non preempt kernel, the 10 second run
+ * will stop everything while it runs. Instead, we will
+ * call cond_resched and also add any time that was
+ * lost by a rescedule.
+ *
+ * Do a cond resched at the same frequency we would
+ * wake up the reader.
+ */
cond_resched();
#endif
+ try_to_freeze();
+ }
} while (ktime_before(end_time, timeout) && !kill_test);
trace_printk("End ring buffer hammer\n");
@@ -356,12 +360,6 @@ static void ring_buffer_producer(void)
}
}
-static void ring_buffer_consumer_thread_init(void *arg)
-{
- /* it does not matter where we freeze */
- current->flags |= PF_NOFREEZE;
-}
-
static void ring_buffer_consumer_thread_func(void *arg)
{
if (kill_test)
@@ -375,9 +373,6 @@ static void ring_buffer_consumer_thread_func(void *arg)
static void ring_buffer_producer_thread_init(void *arg)
{
init_completion(&read_start);
-
- /* it does not matter where we freeze */
- current->flags |= PF_NOFREEZE;
}
static void ring_buffer_producer_thread_func(void *arg)
@@ -413,7 +408,6 @@ static int __init ring_buffer_benchmark_init(void)
return -ENOMEM;
consumer_kti.type = KTI_INT_SLEEP;
- consumer_kti.func = ring_buffer_consumer_thread_init;
consumer_kti.func = ring_buffer_consumer_thread_func;
if (!disable_reader) {
--
1.8.5.6
--
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