[AMD Official Use Only - Internal Distribution Only]
> > +static struct attribute *procfs_stats_attrs[] = {
> > + NULL
> > +};
>
> We could probably use this to populate the attributes in stats automatically instead of calling sysfs_create_file and sysfs_remove_file manually. Then we may also not need the attr_evict attribute in the pdd.
We use the attr_evict as an anchor to locate the pdd in kfd_procfs_stats_show(). So, if we use the default attributes, and drop the calls to sysfs_create_file, and sysfs_remove_file, it makes kfd_procfs_stats_show() much more complicated, as we then need to find the correct pdd without using the anchor attr_evict.
Also, if we create the file via the default attributes, as you suggest, and don't drop the attr_evict, we get incorrect results.
The code is much cleaner I think leaving the calls to sysfs_create_file, and sysfs_remove_file() as they are, and leaving the default stats attributes NULL. If some other stats are added later, that don't require the pdd, then they can be added to this structure, but I don't think the eviction stats should be.
-----Original Message-----
From: Kuehling, Felix <Felix.Kuehling@xxxxxxx>
Sent: Wednesday, September 16, 2020 6:46 PM
To: Cox, Philip <Philip.Cox@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Tye, Tony <Tony.Tye@xxxxxxx>; Morichetti, Laurent <Laurent.Morichetti@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>; Errabolu, Ramesh <Ramesh.Errabolu@xxxxxxx>
Subject: Re: [PATCH v3 2/3] drm/amdkfd: Add process eviction counters to sysfs
Some nit-picks and one more possible simplification inline. I want to make adding more stats later as painless as possible.
Looks good otherwise.
Am 2020-09-16 um 2:42 p.m. schrieb Philip Cox:
> Add per-process eviction counters to sysfs to keep track of how many
> eviction events have happened for each process.
>
> v2: rename the stats dir, and track all evictions per process, per device.
> v3: Simplify the stats kobject handling and cleanup.
>
> Signed-off-by: Philip Cox <Philip.Cox@xxxxxxx>
> ---
> .../drm/amd/amdkfd/kfd_device_queue_manager.c | 9 ++
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 9 +-
> drivers/gpu/drm/amd/amdkfd/kfd_process.c | 97 +++++++++++++++++++
> 3 files changed, 114 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index cafbc3aa980a..5b9e0df2a90e 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -653,6 +653,7 @@ static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
> pr_info_ratelimited("Evicting PASID 0x%x queues\n",
> pdd->process->pasid);
>
> + pdd->last_evict_timestamp = get_jiffies_64();
> /* Mark all queues as evicted. Deactivate all active queues on
> * the qpd.
> */
> @@ -714,6 +715,7 @@ static int evict_process_queues_cpsch(struct device_queue_manager *dqm,
> q->properties.is_active = false;
> decrement_queue_count(dqm, q->properties.type);
> }
> + pdd->last_evict_timestamp = get_jiffies_64();
> retval = execute_queues_cpsch(dqm,
> qpd->is_debug ?
> KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES :
> @@ -732,6 +734,7 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
> struct mqd_manager *mqd_mgr;
> struct kfd_process_device *pdd;
> uint64_t pd_base;
> + uint64_t eviction_duration;
> int retval, ret = 0;
>
> pdd = qpd_to_pdd(qpd);
> @@ -799,6 +802,8 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
> ret = retval;
> }
> qpd->evicted = 0;
> + eviction_duration = get_jiffies_64() - pdd->last_evict_timestamp;
> + atomic64_add(eviction_duration, &pdd->evict_duration_counter);
> out:
> if (mm)
> mmput(mm);
> @@ -812,6 +817,7 @@ static int restore_process_queues_cpsch(struct device_queue_manager *dqm,
> struct queue *q;
> struct kfd_process_device *pdd;
> uint64_t pd_base;
> + uint64_t eviction_duration;
> int retval = 0;
>
> pdd = qpd_to_pdd(qpd);
> @@ -845,6 +851,9 @@ static int restore_process_queues_cpsch(struct device_queue_manager *dqm,
> retval = execute_queues_cpsch(dqm,
> KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
> qpd->evicted = 0;
> + eviction_duration = get_jiffies_64() - pdd->last_evict_timestamp;
> + atomic64_add(eviction_duration, &pdd->evict_duration_counter);
> +
> out:
> dqm_unlock(dqm);
> return retval;
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index 023629f28495..a500fe611b43 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.
> @@ -692,6 +692,13 @@ struct kfd_process_device {
> uint64_t sdma_past_activity_counter;
> struct attribute attr_sdma;
> char sdma_filename[MAX_SYSFS_FILENAME_LEN];
> +
> + /* Eviction activity tracking */
> + unsigned long last_evict_timestamp;
get_jiffies_64 returns u64. You should use an equivalent type (uint64_t) here for consistency.
> + atomic64_t evict_duration_counter;
> + struct attribute attr_evict;
> +
> + struct kobject *kobj_stats;
> };
>
> #define qpd_to_pdd(x) container_of(x, struct kfd_process_device, qpd)
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index 1e15aa7d8ae8..b4ba394ad599 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_stats_show(struct kobject *kobj,
> + struct attribute *attr, char *buffer) {
> + if (strcmp(attr->name, "evicted_ms") == 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_stats_ops = {
> + .show = kfd_procfs_stats_show,
> +};
> +
> +static struct attribute *procfs_stats_attrs[] = {
> + NULL
> +};
We could probably use this to populate the attributes in stats automatically instead of calling sysfs_create_file and sysfs_remove_file manually. Then we may also not need the attr_evict attribute in the pdd.
> +
> +static struct kobj_type procfs_stats_type = {
> + .sysfs_ops = &procfs_stats_ops,
> + .default_attrs = procfs_stats_attrs, };
> +
> int kfd_procfs_add_queue(struct queue *q) {
> struct kfd_process *proc;
> @@ -417,6 +450,60 @@ static int kfd_sysfs_create_file(struct kfd_process *p, struct attribute *attr,
> return ret;
> }
>
> +static int kfd_procfs_add_sysfs_stats(struct kfd_process *p) {
> + int ret = 0;
> + struct kfd_process_device *pdd;
> + char stats_dir_filename[MAX_SYSFS_FILENAME_LEN];
> +
> + if (!p)
> + return -EINVAL;
> +
> + if (!p->kobj)
> + return -EFAULT;
> +
> + /*
> + * Create sysfs files for each GPU:
> + * - proc/<pid>/stats_<gpuid>/
> + * - proc/<pid>/stats_<gpuid>/evicted_ms
> + */
> + list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
> + struct kobject *kobj_stats;
> +
> +
> + snprintf(stats_dir_filename, MAX_SYSFS_FILENAME_LEN,
> + "stats_%u", pdd->dev->id);
> + kobj_stats = kfd_alloc_struct(kobj_stats);
> + if (!kobj_stats) {
> + kfree(kobj_stats);
If allocation failed, there is nothing to free.
Regards,
Felix
> + return -ENOMEM;
> + }
> +
> + ret = kobject_init_and_add(kobj_stats,
> + &procfs_stats_type,
> + p->kobj,
> + stats_dir_filename);
> +
> + if (ret) {
> + pr_warn("Creating KFD proc/stats_%s folder failed",
> + stats_dir_filename);
> + kobject_put(kobj_stats);
> + goto err;
> + }
> +
> + pdd->kobj_stats = kobj_stats;
> + pdd->attr_evict.name = "evicted_ms";
> + pdd->attr_evict.mode = KFD_SYSFS_FILE_MODE;
> + sysfs_attr_init(&pdd->attr_evict);
> + ret = sysfs_create_file(kobj_stats, &pdd->attr_evict);
> + if (ret)
> + pr_warn("Creating eviction stats 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 +747,11 @@ 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_stats(process);
> + if (ret)
> + pr_warn("Creating sysfs stats 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", @@ -816,6
> +908,10 @@ static void kfd_process_wq_release(struct work_struct *work)
> list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
> sysfs_remove_file(p->kobj, &pdd->attr_vram);
> sysfs_remove_file(p->kobj, &pdd->attr_sdma);
> + sysfs_remove_file(p->kobj, &pdd->attr_evict);
> + kobject_del(pdd->kobj_stats);
> + kobject_put(pdd->kobj_stats);
> + pdd->kobj_stats = NULL;
> }
>
> kobject_del(p->kobj);
> @@ -1125,6 +1221,7 @@ 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 */
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