On 2012-04-10 17:31, Stefan Hajnoczi wrote:
> On Thu, Apr 5, 2012 at 11:59 AM, Jan Kiszka <jan.kis...@siemens.com> wrote:
>> Use QemuEvent for signaling POSIX AIO completions. If native eventfd
>> support is available, this avoids multiple read accesses to drain
>> multiple pending signals.
>>
>> Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
>> ---
>> posix-aio-compat.c | 62
>> ++++++----------------------------------------------
>> 1 files changed, 7 insertions(+), 55 deletions(-)
>
> We can save a file descriptor by scheduling a BH (if not already
> scheduled) and calling qemu_notify_event() instead of using a
> dedicated QemuEvent. I may have missed something, just got back from
> vacation :).
Likely feasible, but not that straightforward: We would still have to
provide qemu_aio_{wait,flush,...} services for posix-aio-compat, I presume.
Jan
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