[RFC 6/6] drm/i915: Implement fdinfo memory stats printing
Rob Clark
robdclark at gmail.com
Tue Apr 18 16:08:01 UTC 2023
On Tue, Apr 18, 2023 at 7:58 AM Tvrtko Ursulin
<tvrtko.ursulin at linux.intel.com> wrote:
>
>
> On 18/04/2023 15:39, Rob Clark wrote:
> > On Mon, Apr 17, 2023 at 8:56 AM Tvrtko Ursulin
> > <tvrtko.ursulin at linux.intel.com> wrote:
> >>
> >> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> >>
> >> Show how more driver specific set of memory stats could be shown,
> >> more specifically where object can reside in multiple regions, showing all
> >> the supported stats, and where there is more to show than just user visible
> >> objects.
> >>
> >> WIP...
> >>
> >> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> >> ---
> >> drivers/gpu/drm/i915/i915_driver.c | 5 ++
> >> drivers/gpu/drm/i915/i915_drm_client.c | 102 +++++++++++++++++++++++++
> >> drivers/gpu/drm/i915/i915_drm_client.h | 8 ++
> >> drivers/gpu/drm/i915/i915_drv.h | 2 +
> >> 4 files changed, 117 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> >> index 6493548c69bf..4c70206cbc27 100644
> >> --- a/drivers/gpu/drm/i915/i915_driver.c
> >> +++ b/drivers/gpu/drm/i915/i915_driver.c
> >> @@ -1806,6 +1806,11 @@ static const struct drm_driver i915_drm_driver = {
> >> .dumb_create = i915_gem_dumb_create,
> >> .dumb_map_offset = i915_gem_dumb_mmap_offset,
> >>
> >> +#ifdef CONFIG_PROC_FS
> >> + .query_fdinfo_memory_regions = i915_query_fdinfo_memory_regions,
> >> + .query_fdinfo_memory_stats = i915_query_fdinfo_memory_stats,
> >> +#endif
> >> +
> >> .ioctls = i915_ioctls,
> >> .num_ioctls = ARRAY_SIZE(i915_ioctls),
> >> .fops = &i915_driver_fops,
> >> diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c
> >> index c654984189f7..65857c68bdb3 100644
> >> --- a/drivers/gpu/drm/i915/i915_drm_client.c
> >> +++ b/drivers/gpu/drm/i915/i915_drm_client.c
> >> @@ -12,6 +12,7 @@
> >> #include <drm/drm_print.h>
> >>
> >> #include "gem/i915_gem_context.h"
> >> +#include "intel_memory_region.h"
> >> #include "i915_drm_client.h"
> >> #include "i915_file_private.h"
> >> #include "i915_gem.h"
> >> @@ -112,4 +113,105 @@ void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
> >> for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
> >> show_client_class(p, i915, file_priv->client, i);
> >> }
> >> +
> >> +char **
> >> +i915_query_fdinfo_memory_regions(struct drm_device *dev, unsigned int *num)
> >> +{
> >> + struct drm_i915_private *i915 = to_i915(dev);
> >> + struct intel_memory_region *mr;
> >> + enum intel_region_id id;
> >> +
> >> + /* FIXME move to init */
> >> + for_each_memory_region(mr, i915, id) {
> >> + if (!i915->mm.region_names[id])
> >> + i915->mm.region_names[id] = mr->name;
> >> + }
> >> +
> >> + *num = id;
> >> +
> >> + return i915->mm.region_names;
> >> +}
> >> +
> >> +static void
> >> +add_obj(struct drm_i915_gem_object *obj, struct drm_fdinfo_memory_stat *stats)
> >> +{
> >> + struct intel_memory_region *mr;
> >> + u64 sz = obj->base.size;
> >> + enum intel_region_id id;
> >> + unsigned int i;
> >> +
> >> + if (!obj)
> >> + return;
> >> +
> >> + /* Attribute size and shared to all possible memory regions. */
> >> + for (i = 0; i < obj->mm.n_placements; i++) {
> >> + mr = obj->mm.placements[i];
> >> + id = mr->id;
> >> +
> >> + stats[id].size += sz;
> >
> > This implies that summing up all of the categories is not the same as
> > the toplevel stats that I was proposing
Sorry, I mis-spoke, I meant "summing up all of the regions is not..."
> Correct, my categories are a bit different. You had private and shared as two mutually exclusive buckets, and then resident as subset of either/both. I have size as analogue to VmSize and resident as a subset of that, analogue to VmRss.
>
I split shared because by definition shared buffers can be counted
against multiple drm_file's, whereas private is only counted against
the single drm_file. Driver or app changes are unlikely to change the
shared size, whereas private footprint is a thing you can optimize to
some degree.
> Shared is a bit wishy-washy, not sure about that one in either proposals. It can be either imported or exported buffers, but in essence I think it fits better as a subset of total size.
Imported vs exported doesn't really matter.. it is just an
implementation detail of the winsys. But I think it is useful to know
how much of an app's footprint is shared vs private. You could
express it different ways, but my proposal had private and shared,
from which you can calculate total:
total = private + shared
but you could flip the path around and advertise just total and
shared, and calculate private from that.
BR,
-R
> Regards,
>
> Tvrtko
>
> >> + if (obj->base.handle_count > 1)
> >> + stats[id].shared += sz;
> >> + }
> >> +
> >> + /* Attribute other categories to only the current region. */
> >> + mr = obj->mm.region;
> >> + if (mr)
> >> + id = mr->id;
> >> + else
> >> + id = INTEL_REGION_SMEM;
> >> +
> >> + if (!i915_gem_object_has_pages(obj))
> >> + return;
> >> +
> >> + stats[id].resident += sz;
> >> +
> >> + if (!dma_resv_test_signaled(obj->base.resv, dma_resv_usage_rw(true)))
> >> + stats[id].active += sz;
> >> + else if (i915_gem_object_is_shrinkable(obj) &&
> >> + obj->mm.madv == I915_MADV_DONTNEED)
> >> + stats[id].purgeable += sz;
> >> +}
> >> +
> >> +void
> >> +i915_query_fdinfo_memory_stats(struct drm_file *file,
> >> + struct drm_fdinfo_memory_stat *stats)
> >> +{
> >> + struct drm_i915_file_private *file_priv = file->driver_priv;
> >> + struct i915_drm_client *client = file_priv->client;
> >> + struct drm_gem_object *drm_obj;
> >> + struct i915_gem_context *ctx;
> >> + int id;
> >> +
> >> + /*
> >> + * FIXME - we can do this better and in fewer passes if we are to start
> >> + * exporting proper memory stats.
> >> + */
> >> +
> >> + /* User created objects */
> >> + spin_lock(&file->table_lock);
> >> + idr_for_each_entry(&file->object_idr, drm_obj, id)
> >> + add_obj(to_intel_bo(drm_obj), stats);
> >> + spin_unlock(&file->table_lock);
> >> +
> >> + /* Contexts, rings, timelines, page tables, ... */
> >> + rcu_read_lock();
> >> + list_for_each_entry_rcu(ctx, &client->ctx_list, client_link) {
> >> + struct i915_gem_engines_iter it;
> >> + struct intel_context *ce;
> >> +
> >> + for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
> >> + /* FIXME races?! */
> >> + if (ce->state)
> >> + add_obj(ce->state->obj, stats);
> >> + if (ce->timeline && ce->timeline->hwsp_ggtt)
> >> + add_obj(ce->timeline->hwsp_ggtt->obj, stats);
> >> + if (ce->ring && ce->ring->vma)
> >> + add_obj(ce->ring->vma->obj, stats);
> >> + }
> >> +
> >> + /* TODO vtx->vm page table backing objects */
> >> + }
> >> + rcu_read_unlock();
> >> +}
> >> +
> >> #endif
> >> diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
> >> index 4c18b99e10a4..622936c51903 100644
> >> --- a/drivers/gpu/drm/i915/i915_drm_client.h
> >> +++ b/drivers/gpu/drm/i915/i915_drm_client.h
> >> @@ -14,7 +14,10 @@
> >>
> >> #define I915_LAST_UABI_ENGINE_CLASS I915_ENGINE_CLASS_COMPUTE
> >>
> >> +struct drm_device;
> >> struct drm_file;
> >> +struct drm_fdinfo_memory_stat;
> >> +struct drm_gem_object;
> >> struct drm_printer;
> >>
> >> struct i915_drm_client {
> >> @@ -49,6 +52,11 @@ struct i915_drm_client *i915_drm_client_alloc(void);
> >>
> >> #ifdef CONFIG_PROC_FS
> >> void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file);
> >> +
> >> +char **i915_query_fdinfo_memory_regions(struct drm_device *dev,
> >> + unsigned int *num);
> >> +void i915_query_fdinfo_memory_stats(struct drm_file *file,
> >> + struct drm_fdinfo_memory_stat *stats);
> >> #endif
> >>
> >> #endif /* !__I915_DRM_CLIENT_H__ */
> >> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >> index eb739fb9cdbb..b84d2f0ed2cb 100644
> >> --- a/drivers/gpu/drm/i915/i915_drv.h
> >> +++ b/drivers/gpu/drm/i915/i915_drv.h
> >> @@ -161,6 +161,8 @@ struct i915_gem_mm {
> >>
> >> struct intel_memory_region *regions[INTEL_REGION_UNKNOWN];
> >>
> >> + char *region_names[INTEL_REGION_UNKNOWN];
> >> +
> >> struct notifier_block oom_notifier;
> >> struct notifier_block vmap_notifier;
> >> struct shrinker shrinker;
> >> --
> >> 2.37.2
> >>
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