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Date: Fri, 27 Sep 2002 21:36:55 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Zwane Mwaikambo <zwane@linuxpower.ca>
Cc: Dipankar Sarma <dipankar@in.ibm.com>, Andrew Morton <akpm@digeo.com>,
       lkml <linux-kernel@vger.kernel.org>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: 2.5.38-mm3
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	Zwane Mwaikambo <zwane@linuxpower.ca>,
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References: <20020927152833.D25021@in.ibm.com> <Pine.LNX.4.44.0209280034101.32347-100000@montezuma.mastecende.com>
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> On Fri, 27 Sep 2002, Dipankar Sarma wrote:
>> The counts are off by one.
>> With a UP kernel, I see that fget() cost is negligible.
>> So it is most likely the atomic operations for rwlock acquisition/release
>> in fget() that is adding to its cost. Unless of course my sampling
>> is too less.

On Sat, Sep 28, 2002 at 12:35:30AM -0400, Zwane Mwaikambo wrote:
> Mine is a UP box not an SMP kernel, although preempt is enabled;
> 0xc013d370 <fget>:      push   %ebx
> 0xc013d371 <fget+1>:    mov    %eax,%ecx
> 0xc013d373 <fget+3>:    mov    $0xffffe000,%edx
> 0xc013d378 <fget+8>:    and    %esp,%edx
> 0xc013d37a <fget+10>:   incl   0x4(%edx)

Do you have instruction-level profiles to show where the cost is on UP?


Thanks,
Bill
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