From: Richard Weinberger <richard@nod.at>
To: "Sébastien Frémal" <sebastien.fremal@gmail.com>,
"Richard Weinberger" <richard.weinberger@gmail.com>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Skas Mode : How does it work ?
Date: Mon, 02 Jun 2014 11:14:38 +0200 [thread overview]
Message-ID: <538C407E.5080203@nod.at> (raw)
In-Reply-To: <CAOV6k-Br0_aa6+3CDZVcqpOwY+YQR7BE8L2kUTSusp8W-3bBKw@mail.gmail.com>
Hi!
Am 02.06.2014 11:05, schrieb Sébastien Frémal:
> Hello,
>
> Thank you for these informations, it helps me to understand how skas works. I read on the skas website that "This also provides a noticable speedup by eliminating the signal
> delivery that used to happen for every UML system call." I read that UML processes (in TT mode) in user space were controlled with signals (especially to do the transition between
> the user mode and the kernel mode). The presentation of skas suggests that this transition and communications between UML and its processes are not executed anymore with signals.
> Do you know what is used instead ?
In SASK0 mode UML controls the guest processes using the stub pages.
Every guest process has two installed where the UML kernel can inject commands.
Just grep the sources for STUB_CODE and STUB_DATA.
Thanks,
//richard
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prev parent reply other threads:[~2014-06-02 9:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-27 13:58 [uml-devel] Skas Mode : How does it work ? Sébastien Frémal
2014-05-27 19:08 ` Michael Richardson
2014-05-27 21:56 ` stian
2014-05-28 16:21 ` Richard Weinberger
2014-06-02 9:05 ` Sébastien Frémal
2014-06-02 9:14 ` Richard Weinberger [this message]
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