)]}'
{
  "log": [
    {
      "commit": "d637413f3f05b41f678f8004225b33b62274183f",
      "tree": "08a2240395ffef19a3d61ea7de4f55704f8046fe",
      "parents": [
        "d59dd4620fb8d6422555a9e2b82a707718e68327"
      ],
      "author": {
        "name": "Jake Moilanen",
        "email": "moilanen@austin.ibm.com",
        "time": "Sun May 01 08:58:47 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sun May 01 08:58:47 2005 -0700"
      },
      "message": "[PATCH] ppc64: reverse prediction on spinlock busy loop code\n\nOn our raw spinlocks, we currently have an attempt at the lock, and if we do\nnot get it we enter a spin loop.  This spinloop will likely continue for\nawhile, and we pridict likely.\n\nShouldn\u0027t we predict that we will get out of the loop so our next instructions\nare already prefetched.  Even when we miss because the lock is still held, it\nwon\u0027t matter since we are waiting anyways.\n\nI did a couple quick benchmarks, but the results are inconclusive.\n\n\t16-way 690 running specjbb with original code\n\t# ./specjbb 3000 16 1 1 19 30 120\n\t    ...\n\tValid run, Score is 59282\n\n\t16-way 690 running specjbb with unlikely code\n\t# ./specjbb 3000 16 1 1 19 30 120\n\t    ...\n\tValid run, Score is 59541\n\nI saw a smaller increase on a JS20 (~1.6%)\n\n\tJS20 specjbb w/ original code\n\t# ./specjbb 400 2 1 1 19 30 120\n\t   ...\n\tValid run, Score is 20460\n\n\tJS20 specjbb w/ unlikely code\n\t# ./specjbb 400 2 1 1 19 30 120\n\t   ...\n\tValid run, Score is 20803\n\nAnton said:\n\nMispredicting the spinlock busy loop also means we slow down the rate at which\nwe do the loads which can be good for heavily contended locks.\n\nNote: There are some gcc issues with our default build and branch prediction,\nbut a CONFIG_POWER4_ONLY build should emit them correctly.  I\u0027m working with\nAlan Modra on it now.\n\nSigned-off-by: Jake Moilanen \u003cmoilanen@austin.ibm.com\u003e\nSigned-off-by: Anton Blanchard \u003canton@samba.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
      "tree": "0bba044c4ce775e45a88a51686b5d9f90697ea9d",
      "parents": [],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "message": "Linux-2.6.12-rc2\n\nInitial git repository build. I\u0027m not bothering with the full history,\neven though we have it. We can create a separate \"historical\" git\narchive of that later if we want to, and in the meantime it\u0027s about\n3.2GB when imported into git - space that would just make the early\ngit days unnecessarily complicated, when we don\u0027t have a lot of good\ninfrastructure for it.\n\nLet it rip!\n"
    }
  ]
}