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AndresFreundTec's profile
Andres Freund (Tech)
Andres Freund (Tech)
Andres Freund (Tech)
@AndresFreundTec

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Andres Freund (Tech)

@AndresFreundTec

Postgres developer, working at Microsoft. Also: politics nerd, expat German in the US. Account for tech related things. For politics: @AndresFreundPol

San Francisco, CA
Joined August 2017

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    1. Jens Axboe‏ @axboe Feb 23
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      Seems like it'd be a shame to have the polled/async improvements and not include automatic buffer selection. I guess that'll be the Sunday project.

      1 reply 0 retweets 14 likes
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    2. Jens Axboe‏ @axboe Feb 23
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      I have this working now, but I'm not sure how best to handle buffer life times. IOW, kernel selects a free buffer, but userspace needs to signal when it can be reused. I'm thinking a specific opcode for that, IORING_OP_BUFFER_FREE or something. Taking suggestions and/or advice!

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    3. Jens Axboe‏ @axboe Feb 23
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      I kind of like the opcode idea, as let's say you do a recv() and a buffer is selected. Presumably you're going to use that for a send or write, and you could link the IORING_OP_BUFFER_FREE command after that.

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    4. Andres Freund (Tech)‏ @AndresFreundTec Feb 23
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      Replying to @axboe

      IORING_OP_BUFFER_FREE suggests that buffers are registered somehow (?). How about instead having an explicit opcode that provides a buffer for a one-off use? A IORING_OP_PROVIDE_BUFFER registers a buffer as available, with buf_index (under different name) indicating a 'group'.

      2 replies 0 retweets 0 likes
      Andres Freund (Tech)‏ @AndresFreundTec Feb 23
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      Replying to @AndresFreundTec @axboe

      And a IORING_OP_RECVMSG can flag use of a group with something like IOSQE_PROVIDED_BUFFER, and buf_index indicating the group.

      2:46 PM - 23 Feb 2020
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