From: Dimitri Sivanich <sivanich@sgi.com>
To: Jack Steiner <steiner@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>,
linux-kernel@vger.kernel.org, akpm@osdl.org,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [RFC] - Move call to calc_load()
Date: Tue, 21 Mar 2006 14:48:45 -0600 [thread overview]
Message-ID: <20060321204845.GB26124@sgi.com> (raw)
In-Reply-To: <20060321203647.GA26135@elte.hu>
On Tue, Mar 21, 2006 at 09:36:47PM +0100, Ingo Molnar wrote:
> * Jack Steiner <steiner@sgi.com> wrote:
>
> > Here is the patch that I am proposing. This patch is incomplete
> > because it addresses only the IA64 architecture. If this approach is
> > acceptible, I'll update the patch to cover all architectures.
> >
> > Signed-off-by: Jack Steiner <steiner@sgi.com>
>
> i agree with your analysis - there is no reason calc_load() should be
> under xtime_lock. I guess no-one noticed this so far because calc_load()
> iterating over hundreds of CPUs isnt too common.
I tested this patch and it works well for eliminating latencies due to
contention for the xtime_lock. Without the patch the latencies are
quite substantial at higher cpu counts.
prev parent reply other threads:[~2006-03-21 20:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-21 20:32 [RFC] - Move call to calc_load() Jack Steiner
2006-03-21 20:36 ` Ingo Molnar
2006-03-21 20:48 ` Dimitri Sivanich [this message]
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