From: Jeff Dike <jdike@addtoit.com>
To: Krishnappa Abhijith-A21204 <abhijith@motorola.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Regarding Process creation in UML tracing thread mode
Date: Wed, 21 Mar 2007 11:54:09 -0400 [thread overview]
Message-ID: <20070321155409.GB6962@c2.user-mode-linux.org> (raw)
In-Reply-To: <0A01463223B8164194908CAC85B66A1201B0F107@ZMY16EXM67.ds.mot.com>
On Wed, Mar 21, 2007 at 10:11:48PM +0800, Krishnappa Abhijith-A21204 wrote:
> Also from your below response it means that: UML just have a
> task_structure maintained....
> Also I never saw the UML specific schedule() code in .../arch/um does
> UML uses the host schedule itself ?
UML, like any other port, uses the schedule() in kernel/sched.c. The
UML-specific context switching indirectly uses the host's scheduler
when it switches from one host process to another. TT mode has the
outgoing process sleeping in a read() on a pipe after waking up the
incoming process from its read by writing a byte down its pipe.
But the host makes no scheduling decisions between UML processes - the
UML scheduler makes the decisions and the host scheduler just decides
when the process chosen by the UML scheduler actually gets some CPU
time.
Jeff
--
Work email - jdike at linux dot intel dot com
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prev parent reply other threads:[~2007-03-21 15:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-21 11:51 [uml-devel] Regarding Process creation in UML tracing thread mode Krishnappa Abhijith-A21204
2007-03-21 13:55 ` Jeff Dike
2007-03-21 14:11 ` Krishnappa Abhijith-A21204
2007-03-21 15:54 ` Jeff Dike [this message]
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