[Intel-gfx] [PATCH libdrm 0/5] improve reuse implementation

James Xiong james.xiong at intel.com
Fri Mar 16 01:20:09 UTC 2018

From: "Xiong, James" <james.xiong at intel.com>

With gem_reuse enabled, when a buffer size is different than
the sizes of buckets, it is aligned to the next bucket's size,
which means about 25% more memory than the requested is allocated
in the worst senario. For example:

Orignal size    Actual
32KB+1Byte      40KB
8MB+1Byte       10MB
96MB+1Byte      112MB

This is very memory expensive and make the reuse feature less
favorable than it deserves to be.

This series aligns the reuse buffer size on page size instead to
save memory. Performed gfxbench tests on Gen9 without LLC, the
performances and reuse ratioes (reuse count/allocation count) were
same as before, saved memory usage by 1% ~ 7%(gl_manhattan: peak
allocated memory size was reduced from 448401408 to 419078144).

v2: split the patch to a series of small functional changes (Chris)

Xiong, James (5):
  intel: reorganize internal function
  intel: get a cached bucket by size
  intel: get a cached buffer by size for reuse
  intel: purge cached bucket when its cached buffer is evicted

 intel/intel_bufmgr_gem.c | 180 +++++++++++++++++++++++++----------------------
 libdrm_lists.h           |   6 ++
 2 files changed, 100 insertions(+), 86 deletions(-)


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