submit bio directly from userspace

From	Mike Krinkin <krinkin.m.u@gmail.com>
Newsgroups	linux.kernel
Subject	submit bio directly from userspace
Date	2015-10-07 16:50 +0200
Message-ID	<qgYcy-7Ng-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

i'm developing block layer workload simulator/player and need to
generate bios as close as possible to the ones in original workload.
To play workload i employ aio + O_DIRECT, but all IOs end up as bios
with SYNC flag set. So i wonder is there any way to control bios
flags from userspace or, maybe, any other options to generate
workload from userspace except aio + O_DIRECT with more precise
control over bio flags?
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submit bio directly from userspace Mike Krinkin <krinkin.m.u@gmail.com> - 2015-10-07 16:50 +0200
  Re: submit bio directly from userspace Dmitry Monakhov <dmonakhov@openvz.org> - 2015-10-09 13:50 +0200
    Re: submit bio directly from userspace Jens Axboe <axboe@kernel.dk> - 2015-10-09 16:40 +0200

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