> I'm pleased to announce the availability of version 6 of the syslet subsystem.
> Ingo and I agreed that I'll handle syslet releases while he's busy with CFS. I
> copied the cc: list from Ingo's v5 announcement. If you'd like to be dropped
> (or added), please let me know.
>
> The v6 patch series against 2.6.21 can be downloaded from:
>
>
http://oss.oracle.com/~zab/syslets/v6/
>
> Example applications and previous syslet releases can be found at:
>
>
http://people.redhat.com/~mingo/syslet-patches/
>
> The syslet subsystem aims to provide user-space with an efficient interface for
> managing the asynchronus submission and completion of existing system calls.
>
> The only changes since v5 are small changes that I made to support the
> experimental aio patch described below.
>
> My syslet subsystem todo list is as follows, in no particular order:
>
> - replace WARN_ON() calls with error handling or avoidance
> - split the x86_64-async.patch into more specific patches
> - investigate integration with ptrace
> - investigate rare ./syslet-test cpu spinning
> - provide distro kernel rpms and documentation for developers
> - compat design problems, still?
http://lkml.org/lkml/2007/3/7/523
>
> Included in this patch series is an experimental patch which reworks fs/aio.c
> to reuse the syslet subsystem to process iocb requests from user space. The
> intent of this work is to simplify the code and broaden aio functionality.
>
> Many issues need to be addressed before this aio work could be merged:
>
> - support cancellation by sending signals to async_threads
> - figure out what to do about signals from handlers, like SIGXFSZ
> - verify that heavy loads do not consume excessive cpu or memory
> - concurrent dio writes
> - cfq gets confused, share io_context amongst threads?
> - restrict allowed operations like .aio_{r,w} methods used to
>
> More details on this work in progress can be found in the patch.
>
> Any and all feedback is welcome and encouraged!
