Re: [uml-devel] [PATCH v4] um: Switch clocksource to hrtimers

[Richard Weinberger <richard@nod.at>]

Am 02.11.2015 um 17:16 schrieb Anton Ivanov:
> Background: UML is using an obsolete itimer call for
> all timers and "polls" for kernel space timer firing
> in its userspace portion resulting in a long list
> of bugs and incorrect behaviour(s). It also uses
> ITIMER_VIRTUAL for its timer which results in the
> timer being dependent on it running and the cpu
> load.
> 
> This patch fixes this by moving to posix high resolution
> timers firing off CLOCK_MONOTONIC and relaying the timer
> correctly to the UML userspace.
> 
> FIXES: crashes when hosts suspends/resumes
> 
> FIXES: broken userspace timers - effecive ~40Hz instead
> of what they should be. Note - this modifies skas behavior
> by no longer setting an itimer per clone(). Timer events
> are relayed instead.
> 
> FIXES: kernel network packet scheduling disciplines
> FIXES: tcp behaviour especially under load
> FIXES: various timer related corner cases
> 
> IMPROVES: overall responsiveness of the userspace
> 
> Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
> Signed-off-by: Anton Ivanov <aivanov@brocade.com>

Applied!

Thanks,
//richard

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