)]}'
{
  "commit": "eefe7fb19e503e021502c2d8311b85a128d0e054",
  "tree": "4df1e660a01f5a81ff1a4348df89bf38421daa70",
  "parents": [
    "76ab3a4eb0ad71363a355c651ca908b044f208cb"
  ],
  "author": {
    "name": "Keiichi Watanabe",
    "email": "keiichiw@chromium.org",
    "time": "Tue Nov 17 17:58:35 2020 +0900"
  },
  "committer": {
    "name": "Commit Bot",
    "email": "commit-bot@chromium.org",
    "time": "Wed Dec 16 06:03:54 2020 +0000"
  },
  "message": "devices: virtio: fs: DAX based shared memory support\n\nSupport virtio-fs\u0027s DAX (direct memory access) operation which allows the guest\nto directly access file pages.\nSpecifically, FUSE_SETUP_MAPPING and FUSE_REMOVE_MAPPING operations are\nsupported.\n\nThis option can be used by specifing `dax` option when mount a file system in\nthe guest.\n\nThe DAX optoin improved file I/O performance in most cases.\nIn Fio tests, both of read and write score were improved by 1.3-14x depending on\ntest cases.\nIn Blogbench tests, which create many small files, DAX improved the write score\nby 1.5x while the read score was reduced to ~25% (20391 -\u003e 4593).\n\nHere is an excerpt of results:\nFio\n* seq_read:     10.2x (143528 -\u003e 1464911)\n* seq_write:     3.3x (61253 -\u003e 896791)\n* rand_read:    11.6x (138753 -\u003e 1612739)\n* rand_write:   14.6x (61253 -\u003e 896791)\n* surfing_read:  1.3x (98473 -\u003e 127907)\n* surfing_write: 1.3x (83309 -\u003e 108089)\n\nBlogbench\n* read:  0.23x (20391 -\u003e 4593)\n* write: 1.50x (248 -\u003e 373)\n\nBUG\u003db:147341783\nTEST\u003dRun vm.{Blogbench, Fio} with CL:2291856\n\nChange-Id: I4a47c601412ed32d926de6304337e1594252d258\nReviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2108315\nTested-by: kokoro \u003cnoreply+kokoro@google.com\u003e\nTested-by: Keiichi Watanabe \u003ckeiichiw@chromium.org\u003e\nCommit-Queue: Keiichi Watanabe \u003ckeiichiw@chromium.org\u003e\nReviewed-by: Chirantan Ekbote \u003cchirantan@chromium.org\u003e\n",
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