[sheepdog] [PATCH v4 0/4] sheep: writeback cache semantics in backend store

[Hitoshi Mitake]

(2012/09/07 16:08), MORITA Kazutaka wrote:
> At Fri,  7 Sep 2012 14:25:50 +0900,
> Hitoshi Mitake wrote:
>>
>> This patch series implements writeback cache semantics in backend
>> store of sheep. Current backend store farm and plain_store calls
>> open() with O_DSYNC, so every object write causes slow disk
>> access. This patch series try to reduce this overhead with flushing
>> disk cache with the invocation of SD_OP_FLUSH_VDI instead of every
>> object write. This strategy can improve performance when a number of
>> VMs is not so large.
>>
>> Hitoshi Mitake (4):
>>    sheep: change gateway_forward_request() for forwarding requests to
>>      all other nodes
>>    sheep: add new operation flush() to store_driver
>>    sheep: add SD_OP_FLUSH_NODES and SD_OP_FLUSH_PEER for writeback cache
>>      semantics
>>    tests: modify usage of -w in 018, 019, 020 for new cache option
>>
>>   configure.ac             |    2 +-
>>   include/internal_proto.h |    2 +
>>   include/sheep.h          |   13 ++++
>>   sheep/farm/farm.c        |    1 +
>>   sheep/gateway.c          |   68 +++++++++++++-------
>>   sheep/object_cache.c     |   10 ++--
>>   sheep/ops.c              |   45 +++++++++++--
>>   sheep/plain_store.c      |   31 +++++++++
>>   sheep/request.c          |    2 +-
>>   sheep/sheep.c            |  160 ++++++++++++++++++++++++++++++++++++++--------
>>   sheep/sheep_priv.h       |   33 ++++++++--
>>   sheep/store.c            |    9 +--
>>   tests/018                |    2 +-
>>   tests/019                |    2 +-
>>   tests/020                |    2 +-
>>   15 files changed, 306 insertions(+), 76 deletions(-)
>
> Applied, thanks!
>
> Can you update a wiki page, too?
>
>    https://github.com/collie/sheepdog/wiki/Backend-Stores-and-Object-Cache
>

Sure, I'll update the wiki.

Thanks,
Hitoshi