linux-kernel - Re: [PATCH 0/2] ia64: possible module unwind table optimisation

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Message-ID: <AANLkTi=hPcXC1=Lrey1H_UHRJRJ-NdTsvmyxgP_n+dM8@mail.gmail.com>
Date:	Wed, 15 Sep 2010 10:28:59 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Phil Carmody <ext-phil.2.carmody@...ia.com>
Cc:	"fenghua.yu@...el.com" <fenghua.yu@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] ia64: possible module unwind table optimisation

On Wed, Sep 15, 2010 at 5:48 AM, Phil Carmody
<ext-phil.2.carmody@...ia.com> wrote:
>>   for (table = unw.tables; table; table = table->next)
>>
>> before we find the right table to look?
>
> Yes, that's the one. Sorry I wasn't more explicit.

My usual workload (building new Linux kernels - what else :-) doesn't
seem to generate
any unwind requests.  I reached the loop just 58 times while booting,
and only did 23
steps past the first item [didn't track a histogram, so I don't know
whether that was a
single 23 step lookup, or 23 one-step ones].  Building the kernel
(make -j32) didn't add
to either count.

Workload ideas?

-Tony
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