Convert the bo-cache into 2 phases:
1. A two second cache of recently used buffers, keep untouched.
2. A two second cache of older buffers, marked for eviction.
This helps reduce ioctl traffic on a rapid turnover in working sets. The
issue is that even a 2 second window is enough for an application to
fill all of memory with inactive buffers (and we would rely on the
oom-killer identifying the right culprit).
---
intel/intel_bufmgr_gem.c | 42 +++++++++++++++++++++++++++++++++++-------
1 file changed, 35 insertions(+), 7 deletions(-)
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index f5d6130..ecbf8ee 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -211,6 +211,11 @@ struct _drm_intel_bo_gem {
bool used_as_reloc_target;
/**
+ * Are we keeping this buffer around in semi-permenant cache?
+ */
+ bool dontneed;
+
+ /**
* Boolean of whether we have encountered an error whilst building the relocation tree.
*/
bool has_error;
@@ -714,7 +719,8 @@ retry:
}
if (alloc_from_cache) {
- if (!drm_intel_gem_bo_madvise_internal
+ if (bo_gem->dontneed &&
+ !drm_intel_gem_bo_madvise_internal
(bufmgr_gem, bo_gem, I915_MADV_WILLNEED)) {
drm_intel_gem_bo_free(&bo_gem->bo);
drm_intel_gem_bo_cache_purge_bucket(bufmgr_gem,
@@ -1150,6 +1156,20 @@ drm_intel_gem_bo_mark_mmaps_incoherent(drm_intel_bo *bo)
#endif
}
+static inline void __splice(const drmMMListHead *list,
+ drmMMListHead *prev,
+ drmMMListHead *next)
+{
+ drmMMListHead *first = list->next;
+ drmMMListHead *last = list->prev;
+
+ first->prev = prev;
+ prev->next = first;
+
+ last->next = next;
+ next->prev = last;
+}
+
/** Frees all cached buffers significantly older than @time. */
static void
drm_intel_gem_cleanup_bo_cache(drm_intel_bufmgr_gem *bufmgr_gem, time_t time)
@@ -1162,19 +1182,29 @@ drm_intel_gem_cleanup_bo_cache(drm_intel_bufmgr_gem *bufmgr_gem, time_t time)
for (i = 0; i < bufmgr_gem->num_buckets; i++) {
struct drm_intel_gem_bo_bucket *bucket =
&bufmgr_gem->cache_bucket[i];
+ drmMMListHead madv;
+ DRMINITLISTHEAD(&madv);
while (!DRMLISTEMPTY(&bucket->head)) {
drm_intel_bo_gem *bo_gem;
bo_gem = DRMLISTENTRY(drm_intel_bo_gem,
bucket->head.next, head);
- if (time - bo_gem->free_time <= 1)
+ if (time - bo_gem->free_time < 2*(1+bo_gem->dontneed))
break;
DRMLISTDEL(&bo_gem->head);
-
- drm_intel_gem_bo_free(&bo_gem->bo);
+ if (bo_gem->dontneed) {
+ drm_intel_gem_bo_free(&bo_gem->bo);
+ } else {
+ drm_intel_gem_bo_madvise_internal(bufmgr_gem, bo_gem,
+ I915_MADV_DONTNEED);
+ bo_gem->dontneed = 1;
+ DRMLISTADDTAIL(&bo_gem->head, &madv);
+ }
}
+ if (!DRMLISTEMPTY(&madv))
+ __splice(&madv, &bucket->head, bucket->head.next);
}
bufmgr_gem->time = time;
@@ -1285,9 +1315,7 @@ drm_intel_gem_bo_unreference_final(drm_intel_bo *bo, time_t time)
bucket = drm_intel_gem_bo_bucket_for_size(bufmgr_gem, bo->size);
/* Put the buffer into our internal cache for reuse if we can. */
- if (bufmgr_gem->bo_reuse && bo_gem->reusable && bucket != NULL &&
- drm_intel_gem_bo_madvise_internal(bufmgr_gem, bo_gem,
- I915_MADV_DONTNEED)) {
+ if (bufmgr_gem->bo_reuse && bo_gem->reusable && bucket != NULL) {
bo_gem->free_time = time;
bo_gem->name = NULL;
--
2.1.4
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