[PATCH 2/3] drm/amdkfd: Add process eviction counters to sysfs

Philip Cox Philip.Cox at amd.com
Thu Sep 10 18:54:28 UTC 2020


Add per-process eviction counters to sysfs to keep track of
how many eviction events have happened for each process.

Signed-off-by: Philip Cox <Philip.Cox at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h    |  15 ++-
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 117 +++++++++++++++++++++++
 2 files changed, 130 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 023629f28495..f6902e9c6077 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -631,7 +631,7 @@ enum kfd_pdd_bound {
 	PDD_BOUND_SUSPENDED,
 };
 
-#define MAX_SYSFS_FILENAME_LEN 11
+#define MAX_SYSFS_FILENAME_LEN 15
 
 /*
  * SDMA counter runs at 100MHz frequency.
@@ -692,10 +692,19 @@ struct kfd_process_device {
 	uint64_t sdma_past_activity_counter;
 	struct attribute attr_sdma;
 	char sdma_filename[MAX_SYSFS_FILENAME_LEN];
+
+	/* Eviction activity tracking */
+	atomic64_t evict_duration_counter;
+	struct attribute attr_evict;
+	char evict_filename[MAX_SYSFS_FILENAME_LEN];
 };
 
 #define qpd_to_pdd(x) container_of(x, struct kfd_process_device, qpd)
 
+struct kobj_counters_list {
+	struct list_head counters_list;
+	struct kobject *kobj;
+};
 /* Process data */
 struct kfd_process {
 	/*
@@ -766,13 +775,15 @@ struct kfd_process {
 	/* seqno of the last scheduled eviction */
 	unsigned int last_eviction_seqno;
 	/* Approx. the last timestamp (in jiffies) when the process was
-	 * restored after an eviction
+	 * restored or evicted.
 	 */
 	unsigned long last_restore_timestamp;
+	unsigned long last_evict_timestamp;
 
 	/* Kobj for our procfs */
 	struct kobject *kobj;
 	struct kobject *kobj_queues;
+	struct kobj_counters_list counters;
 	struct attribute attr_pasid;
 };
 
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 1e15aa7d8ae8..2a81d5a790a0 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -344,6 +344,26 @@ static ssize_t kfd_procfs_queue_show(struct kobject *kobj,
 
 	return 0;
 }
+static ssize_t kfd_procfs_counters_show(struct kobject *kobj,
+				     struct attribute *attr, char *buffer)
+{
+	if (strcmp(attr->name, "evictions") == 0) {
+		struct kfd_process_device *pdd = container_of(attr,
+				struct kfd_process_device,
+				attr_evict);
+		uint64_t evict_jiffies;
+
+		evict_jiffies = atomic64_read(&pdd->evict_duration_counter);
+
+		return snprintf(buffer,
+				PAGE_SIZE,
+				"%llu\n",
+				jiffies64_to_msecs(evict_jiffies));
+	} else
+		pr_err("Invalid attribute");
+
+	return 0;
+}
 
 static struct attribute attr_queue_size = {
 	.name = "size",
@@ -376,6 +396,19 @@ static struct kobj_type procfs_queue_type = {
 	.default_attrs = procfs_queue_attrs,
 };
 
+static const struct sysfs_ops procfs_counters_ops = {
+	.show = kfd_procfs_counters_show,
+};
+
+static struct attribute *procfs_counters_attrs[] = {
+	NULL
+};
+
+static struct kobj_type procfs_counters_type = {
+	.sysfs_ops = &procfs_counters_ops,
+	.default_attrs = procfs_counters_attrs,
+};
+
 int kfd_procfs_add_queue(struct queue *q)
 {
 	struct kfd_process *proc;
@@ -417,6 +450,70 @@ static int kfd_sysfs_create_file(struct kfd_process *p, struct attribute *attr,
 	return ret;
 }
 
+static int kfd_procfs_add_sysfs_counters(struct kfd_process *p)
+{
+	int ret = 0;
+	struct kfd_process_device *pdd;
+	char counter_dir_filename[MAX_SYSFS_FILENAME_LEN];
+
+	if (!p)
+		return -EINVAL;
+
+	if (!p->kobj)
+		return -EFAULT;
+
+	INIT_LIST_HEAD(&p->counters.counters_list);
+	/*
+	 * Create sysfs files for each GPU:
+	 * - proc/<pid>/counters_<gpuid>/
+	 * - proc/<pid>/counters_<gpuid>/evictions
+	 */
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+		struct kobj_counters_list *kobj_counter;
+
+		kobj_counter = kzalloc(sizeof(*kobj_counter),
+				GFP_KERNEL);
+		if (!kobj_counter)
+			return -ENOMEM;
+
+		snprintf(counter_dir_filename, MAX_SYSFS_FILENAME_LEN,
+				"counters_%u", pdd->dev->id);
+		kobj_counter->kobj = kfd_alloc_struct(kobj_counter->kobj);
+		if (!kobj_counter->kobj) {
+			kfree(kobj_counter);
+			return -ENOMEM;
+		}
+
+		ret = kobject_init_and_add(kobj_counter->kobj,
+						&procfs_counters_type,
+						p->kobj,
+						counter_dir_filename);
+
+		if (ret) {
+			pr_warn("Creating KFD proc/counters_%s folder failed",
+					counter_dir_filename);
+			kobject_put(kobj_counter->kobj);
+			kfree(kobj_counter);
+			goto err;
+		}
+
+		list_add(&kobj_counter->counters_list,
+				&p->counters.counters_list);
+		snprintf(pdd->evict_filename,
+				MAX_SYSFS_FILENAME_LEN,
+				"evictions");
+		pdd->attr_evict.name = pdd->evict_filename;
+		pdd->attr_evict.mode = KFD_SYSFS_FILE_MODE;
+		sysfs_attr_init(&pdd->attr_evict);
+		ret = sysfs_create_file(kobj_counter->kobj, &pdd->attr_evict);
+		if (ret)
+			pr_warn("Creating eviction counter for gpuid %d failed",
+				(int)pdd->dev->id);
+	}
+err:
+	return ret;
+}
+
 static int kfd_procfs_add_sysfs_files(struct kfd_process *p)
 {
 	int ret = 0;
@@ -660,6 +757,11 @@ struct kfd_process *kfd_create_process(struct file *filep)
 		if (!process->kobj_queues)
 			pr_warn("Creating KFD proc/queues folder failed");
 
+		ret = kfd_procfs_add_sysfs_counters(process);
+		if (ret)
+			pr_warn("Creating sysfs counter dir for pid %d failed",
+				(int)process->lead_thread->pid);
+
 		ret = kfd_procfs_add_sysfs_files(process);
 		if (ret)
 			pr_warn("Creating sysfs usage file for pid %d failed",
@@ -806,6 +908,7 @@ static void kfd_process_wq_release(struct work_struct *work)
 					     release_work);
 	struct kfd_process_device *pdd;
 
+	struct kobj_counters_list *counters;
 	/* Remove the procfs files */
 	if (p->kobj) {
 		sysfs_remove_file(p->kobj, &p->attr_pasid);
@@ -818,6 +921,14 @@ static void kfd_process_wq_release(struct work_struct *work)
 			sysfs_remove_file(p->kobj, &pdd->attr_sdma);
 		}
 
+		list_for_each_entry(counters,
+				&p->counters.counters_list,
+				counters_list) {
+			sysfs_remove_file(p->kobj, &pdd->attr_evict);
+			kobject_del(counters->kobj);
+			kobject_put(counters->kobj);
+		}
+
 		kobject_del(p->kobj);
 		kobject_put(p->kobj);
 		p->kobj = NULL;
@@ -1125,6 +1236,7 @@ struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
 	pdd->runtime_inuse = false;
 	pdd->vram_usage = 0;
 	pdd->sdma_past_activity_counter = 0;
+	atomic64_set(&pdd->evict_duration_counter, 0);
 	list_add(&pdd->per_device_list, &p->per_device_data);
 
 	/* Init idr used for memory handle translation */
@@ -1388,7 +1500,9 @@ int kfd_process_restore_queues(struct kfd_process *p)
 {
 	struct kfd_process_device *pdd;
 	int r, ret = 0;
+	uint64_t eviction_duration;
 
+	eviction_duration = p->last_restore_timestamp - p->last_evict_timestamp;
 	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
 		r = pdd->dev->dqm->ops.restore_process_queues(pdd->dev->dqm,
 							      &pdd->qpd);
@@ -1397,6 +1511,7 @@ int kfd_process_restore_queues(struct kfd_process *p)
 			if (!ret)
 				ret = r;
 		}
+		atomic64_add(eviction_duration, &pdd->evict_duration_counter);
 	}
 
 	return ret;
@@ -1425,6 +1540,8 @@ static void evict_process_worker(struct work_struct *work)
 	 */
 	flush_delayed_work(&p->restore_work);
 
+	p->last_evict_timestamp = get_jiffies_64();
+
 	pr_debug("Started evicting pasid 0x%x\n", p->pasid);
 	ret = kfd_process_evict_queues(p);
 	if (!ret) {
-- 
2.17.1



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