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Re: [Qemu-devel] [RFC][PATCH] qemu-timer: Run timers in alarm timer hand
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [RFC][PATCH] qemu-timer: Run timers in alarm timer handler |
Date: |
Thu, 23 Aug 2012 20:09:44 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-08-23 15:11, Paolo Bonzini wrote:
>>> So, in order to remove the qemu_notify_event completely, what about not
>>> using signals anymore for timers? You could just tweak the select
>>> timeout and drop all the -clock madness. Zero syscalls, practically no
>>> overhead. If this is not precise enough, use timerfd on Linux only
>>
>> Need to think about it. At least, real-time tasks will get proper
>> precision on Linux. Not sure if it will be sufficient on other hosts.
>
> Do we care (I put non-Linux POSIX just a little above Windows but not much)?
Well, at least we should not regress.
For Windows I just found out that we support millisecond resolution in
os_host_main_loop_wait at best due to g_poll. That would be fine, but
what is g_poll really using? Likely not mm-timers...
Jan
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