[Mesa-dev] [PATCH 0/4] improve buffer cache and reuse

[James Xiong]

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

With the current implementation, brw_bufmgr may round up a request
size to the next bucket size, result in 25% more memory allocated in
the worst senario. For example:
Request size    Actual size
32KB+1Byte      40KB
.
8MB+1Byte       10MB
.
96MB+1Byte      112MB
This series align the buffer size up to page instead of a bucket size
to improve memory allocation efficiency. Performances are almost the
same with Basemark ES3, GfxBench4 and 5:

Basemark ES3
           score                    peak memory allocation
  before      after    diff        before    after      diff
21.537462  21.888784  1.61%    419766272  408809472  -10956800
19.566198  19.763429  1.00%			

GfxBench 4.0
                                    score                        peak memory
                     before         after         diff     before   after     diff
gl_4             564.6052246094  565.2348632813  0.11%	578490368 550199296 -28291072
gl_4_off         727.0440063477  703.5833129883	 -3.33%	629501952 598216704 -31285248
gl_manhattan     1053.4223632813 1057.3690185547 0.37%	449568768 421134336 -28434432
gl_trex          2708.0656738281 2699.2646484375 -0.33%	130076672 125042688 -5033984
gl_alu2          1207.1490478516 1212.2220458984 0.42%	55496704  55029760  -466944
gl_driver2       103.0383071899  103.5478439331  0.49%	13107200  12980224  -126976
gl_manhattan_off 1703.4780273438 1736.9074707031 1.92%	490016768 456548352 -33468416
gl_trex_off      2951.6809082031 3058.5422363281 3.49%	157511680 152260608 -5251072
gl_alu2_off      2604.0903320313 2626.2524414063 0.84%	86130688  85483520  -647168
gl_driver2_off   204.0173187256  207.0510101318  1.47%	40869888  40615936  -253952

GfxBench 5.0
            score               peak memory		
         before	after   before     after       diff
gl_5       259   259  1137549312  1038286848 -99262464
gl_5_off   297   297  1170853888  1071357952 -99495936

Xiong, James (4):
  i965/drm: Reorganize code for the next patch
  i965/drm: Round down buffer size and calculate the bucket index
  i965/drm: Searching for a cached buffer for reuse
  i965/drm: Purge the bucket when its cached buffer is evicted

 src/mesa/drivers/dri/i965/brw_bufmgr.c | 139 ++++++++++++++++++---------------
 src/util/list.h                        |   5 ++
 2 files changed, 79 insertions(+), 65 deletions(-)

-- 
2.7.4