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Date:      Wed, 09 May 2018 20:00:57 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 228076] [sched_ule] Not stealing process from loaded CPU
Message-ID:  <bug-228076-227-yHSe7dOQXG@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-228076-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-228076-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228076

--- Comment #8 from Mit Matelske <mit@pt.net> ---
Sorry for the delay!  

I tried the patch out and sched_balance_group now runs but the I can still get
a process stuck in the RUN state on a busy CPU.  FWIW, it doesn't seem like
that mechanism ever moves processes.  All my calls to tdq_move comes from the
tdq_idled loop.

I'm debugging why the process doesn't get moved now.  Weird thing is other
processes are successfully getting moved from the busy CPUs from the tdq_idled
loop.  Just not the stuck process.

Don't know if this helps, but it seems like if I start another process,
something triggers and it will move the stuck process and everything will run
fine for awhile.  Any clues from that?

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