Hi Guys,
The 1st two patches introduce kernel AIO support, most of
is borrowed from previous Dave's work, and thanks to ITER_BVEC,
it is much simper to implement kernel AIO now.
The last two patches applies kernel aio to loop-mq.
Follows benefits from using kernel aio in loop:
- avoid double cache, and memory usage decreased a lot
- system load gets much decreased
In the commit log of patch 4, detailed performance data
and system resource monitor information is provided about
using kernel aio for loop block.
V2:
- remove 'extra' parameter to aio_kernel_alloc()
- try to avoid memory allcation inside queue req callback
- introduce 'use_mq' sysfs file for enabling kernel aio or disabling it
V1:
- link:
http://marc.info/?t=140803157700004&r=1&w=2
- improve failure path in aio_kernel_submit()
drivers/block/loop.c | 173 ++++++++++++++++++++++++++++++++++++++++++++++++--
drivers/block/loop.h | 11 ++++
fs/aio.c | 121 +++++++++++++++++++++++++++++++++++
fs/direct-io.c | 9 ++-
include/linux/aio.h | 17 ++++-
5 files changed, 323 insertions(+), 8 deletions(-)
Thanks,
Ming Lei
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