[intel-gem] Remember last offset of reused BOs to avoid more kernel relocs.

This is good for about 5% on ipers on 965, and should help any cpu-bound app.

diff --git a/src/mesa/drivers/dri/intel/intel_bufmgr_gem.c b/src/mesa/drivers/dri/intel/intel_bufmgr_gem.c
index f762b485f6e0da6275b19b0756dccccda6df341a..3c1c3157e13bf630aa2d19ce1bc23922bcb70adc 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_bufmgr_gem.c
+++ b/src/mesa/drivers/dri/intel/intel_bufmgr_gem.c
@@ -65,6 +65,7 @@ struct intel_validate_entry {
 
 struct dri_gem_bo_bucket_entry {
    uint32_t gem_handle;
+   uint32_t last_offset;
    struct dri_gem_bo_bucket_entry *next;
 };
 
@@ -306,6 +307,7 @@ dri_gem_bo_alloc(dri_bufmgr *bufmgr, const char *name,
            bucket->num_entries--;
 
            bo_gem->gem_handle = entry->gem_handle;
+           bo_gem->bo.offset = entry->last_offset;
            free(entry);
        }
     }
@@ -324,7 +326,6 @@ dri_gem_bo_alloc(dri_bufmgr *bufmgr, const char *name,
        }
     }
 
-    bo_gem->bo.offset = 0;
     bo_gem->bo.virtual = NULL;
     bo_gem->bo.bufmgr = bufmgr;
     bo_gem->name = name;
@@ -436,6 +437,7 @@ dri_gem_bo_unreference(dri_bo *bo)
 
            entry = calloc(1, sizeof(*entry));
            entry->gem_handle = bo_gem->gem_handle;
+           entry->last_offset = bo->offset;
 
            entry->next = NULL;
            *bucket->tail = entry;