[PATCH RFC v4 05/16] drm, cgroup: Add peak GEM buffer allocation stats

[Kenny Ho]

drm.buffer.peak.stats
        A read-only flat-keyed file which exists on all cgroups.  Each
        entry is keyed by the drm device's major:minor.

        Largest (high water mark) GEM buffer allocated in bytes.

Change-Id: I79e56222151a3d33a76a61ba0097fe93ebb3449f
Signed-off-by: Kenny Ho <kenny...@amd.com>
---
 Documentation/admin-guide/cgroup-v2.rst |  6 ++++++
 include/linux/cgroup_drm.h              |  3 +++
 kernel/cgroup/drm.c                     | 12 ++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst 
b/Documentation/admin-guide/cgroup-v2.rst
index 0e29d136e2f9..8588a0ffc69d 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1907,6 +1907,12 @@ DRM Interface Files
 
        Total GEM buffer allocation in bytes.
 
+  drm.buffer.peak.stats
+       A read-only flat-keyed file which exists on all cgroups.  Each
+       entry is keyed by the drm device's major:minor.
+
+       Largest (high water mark) GEM buffer allocated in bytes.
+
 GEM Buffer Ownership
 ~~~~~~~~~~~~~~~~~~~~
 
diff --git a/include/linux/cgroup_drm.h b/include/linux/cgroup_drm.h
index 1d8a7f2cdb4e..974d390cfa4f 100644
--- a/include/linux/cgroup_drm.h
+++ b/include/linux/cgroup_drm.h
@@ -15,6 +15,7 @@
 
 enum drmcg_res_type {
        DRMCG_TYPE_BO_TOTAL,
+       DRMCG_TYPE_BO_PEAK,
        __DRMCG_TYPE_LAST,
 };
 
@@ -24,6 +25,8 @@ enum drmcg_res_type {
 struct drmcg_device_resource {
        /* for per device stats */
        s64                     bo_stats_total_allocated;
+
+       s64                     bo_stats_peak_allocated;
 };
 
 /**
diff --git a/kernel/cgroup/drm.c b/kernel/cgroup/drm.c
index 87ae9164d8d8..0bf5b95668c4 100644
--- a/kernel/cgroup/drm.c
+++ b/kernel/cgroup/drm.c
@@ -129,6 +129,9 @@ static void drmcg_print_stats(struct drmcg_device_resource 
*ddr,
        case DRMCG_TYPE_BO_TOTAL:
                seq_printf(sf, "%lld\n", ddr->bo_stats_total_allocated);
                break;
+       case DRMCG_TYPE_BO_PEAK:
+               seq_printf(sf, "%lld\n", ddr->bo_stats_peak_allocated);
+               break;
        default:
                seq_puts(sf, "\n");
                break;
@@ -177,6 +180,12 @@ struct cftype files[] = {
                .private = DRMCG_CTF_PRIV(DRMCG_TYPE_BO_TOTAL,
                                                DRMCG_FTYPE_STATS),
        },
+       {
+               .name = "buffer.peak.stats",
+               .seq_show = drmcg_seq_show,
+               .private = DRMCG_CTF_PRIV(DRMCG_TYPE_BO_PEAK,
+                                               DRMCG_FTYPE_STATS),
+       },
        { }     /* terminate */
 };
 
@@ -260,6 +269,9 @@ void drmcg_chg_bo_alloc(struct drmcg *drmcg, struct 
drm_device *dev,
                ddr = drmcg->dev_resources[devIdx];
 
                ddr->bo_stats_total_allocated += (s64)size;
+
+               if (ddr->bo_stats_peak_allocated < (s64)size)
+                       ddr->bo_stats_peak_allocated = (s64)size;
        }
        mutex_unlock(&dev->drmcg_mutex);
 }
-- 
2.22.0

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