Date: Thu, 25 Mar 2004 21:30:32 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <ak@suse.de>
Cc: jun.nakajima@intel.com, ricklind@us.ibm.com, piggin@cyberone.com.au,
       linux-kernel@vger.kernel.org, akpm@osdl.org, kernel@kolivas.org,
       rusty@rustcorp.com.au, anton@samba.org, lse-tech@lists.sourceforge.net,
       mbligh@aracnet.com
Subject: Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3
Message-ID: <20040325203032.GA15663@elte.hu>
References: <7F740D512C7C1046AB53446D372001730111990F@scsmsx402.sc.intel.com> <20040325154011.GB30175@wotan.suse.de> <20040325190944.GB12383@elte.hu> <20040325162121.5942df4f.ak@suse.de> <20040325193913.GA14024@elte.hu>
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* Andi Kleen <ak@suse.de> wrote:

> That won't help for threaded programs that use clone(). OpenMP is such
> a case.

this patch:

        redhat.com/~mingo/scheduler-patches/sched-2.6.5-rc2-mm3-A4

does balancing at wake_up_forked_process()-time.

but it's a hard issue. Especially after fork() we do have a fair amount
of cache context, and migrating at this point can be bad for
performance.

	Ingo
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