{"push_id":1213371010,"size":1,"distinct_size":1,"ref":"refs/heads/Bkernel","head":"a01194cbbfceca94af75143199bb68979c98e2d9","before":"ec97630d7f19a703032c795757643b6e3833746d","commits":[{"sha":"a01194cbbfceca94af75143199bb68979c98e2d9","author":{"name":"Jason Hrycay","email":"652a6fc3fad95b6d27622faaaff5b0ae1c38fc63@motorola.com"},"message":"msm: memutils: memcpy, memmove, copy_page optimization\n\nPreload farther to take advantage of the memory bus, and assume\n64-byte cache lines.  Unroll some pairs of ldm/stm as well, for\nunexplainable reasons.\n\nFuture enhancements should include,\n\n- #define for how far to preload, possibly defined separately for\n  memcpy, copy_*_user\n- Tuning for misaligned buffers\n- Tuning for memmove\n- Tuning for small buffers\n- Understanding mechanism behind ldm/stm unroll causing some gains\n  in copy_to_user\n\nBASELINE (msm8960pro):\n======================================================================\nmemcpy 1000MB at 5MB       : took 808850 usec, bandwidth 1236.236 MB/s\ncopy_to_user 1000MB at 5MB : took 810071 usec, bandwidth 1234.234 MB/s\ncopy_from_user 1000MB at 5M: took 942926 usec, bandwidth 1060.060 MB/s\nmemmove 1000GB at 5MB      : took 848588 usec, bandwidth 1178.178 MB/s\ncopy_to_user 1000GB at 4kB : took 847916 usec, bandwidth 1179.179 MB/s\ncopy_from_user 1000GB at 4k: took 935113 usec, bandwidth 1069.069 MB/s\ncopy_page 1000GB at 4kB    : took 779459 usec, bandwidth 1282.282 MB/s\n\nTHIS PATCH:\n======================================================================\nmemcpy 1000MB at 5MB       : took 346223 usec, bandwidth 2888.888 MB/s\ncopy_to_user 1000MB at 5MB : took 348084 usec, bandwidth 2872.872 MB/s\ncopy_from_user 1000MB at 5M: took 348176 usec, bandwidth 2872.872 MB/s\nmemmove 1000GB at 5MB      : took 348267 usec, bandwidth 2871.871 MB/s\ncopy_to_user 1000GB at 4kB : took 377018 usec, bandwidth 2652.652 MB/s\ncopy_from_user 1000GB at 4k: took 371829 usec, bandwidth 2689.689 MB/s\ncopy_page 1000GB at 4kB    : took 383763 usec, bandwidth 2605.605 MB/s\n\nChange-Id: I843fe77192d61ce35a81e75d76fc09f0a472e98a\nSigned-off-by: Chris Fries <C.Fries@motorola.com>","distinct":true,"url":"https://api.github.com/repos/tunturn/z3kernel/commits/a01194cbbfceca94af75143199bb68979c98e2d9"}]}
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