Message-ID: <1372746555.7363.147.camel@marge.simpson.net>
Subject: Re: [PATCH] sched: smart wake-affine
From: Mike Galbraith <efault@gmx.de>
To: Michael Wang <wangyun@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Alex Shi <alex.shi@intel.com>,
        Namhyung Kim <namhyung@kernel.org>, Paul Turner <pjt@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>,
        Ram Pai <linuxram@us.ibm.com>
Date: Tue, 02 Jul 2013 08:29:15 +0200
In-Reply-To: <51D2708C.1050901@linux.vnet.ibm.com>
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On Tue, 2013-07-02 at 14:17 +0800, Michael Wang wrote:

> As Peter mentioned before, we currently need some solution like the
> buddy-idea, and when folks report regression (I suppose they won't...),
> we will have more data then.
> 
> So we could firstly try to regain the lost performance of pgbench, if it
> strip the benefit of other benchmarks, let's fix it, and at last we will
> have a real smart wake-affine and no one will complain ;-)

The idea is plenty simple (and the fastpath has a deep and abiding love
of simple) so the idea itself flies in my book.  It doesn't add as much
knowledge as may be nice to have, but if it adds enough to help pgbench
and ilk without harming others, cool.

-Mike

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