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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
Date: Fri, 27 Sep 2002 21:36:55 -0700	[thread overview]
Message-ID: <20020928043655.GU3530@holomorphy.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0209280034101.32347-100000@montezuma.mastecende.com>

> 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

  reply	other threads:[~2002-09-28  4:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-26  7:57 2.5.38-mm3 Andrew Morton
2002-09-26 12:24 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:29   ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 12:40     ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:42       ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:05         ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 13:17           ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:29         ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:39           ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:46             ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-27  8:27             ` 2.5.38-mm3 Dipankar Sarma
2002-09-27  9:20               ` 2.5.38-mm3 William Lee Irwin III
2002-09-27  9:58                 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 15:04                   ` 2.5.38-mm3 Martin J. Bligh
2002-09-27 17:14                     ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 22:54                       ` 2.5.38-mm3 William Lee Irwin III
2002-09-28  5:41                         ` 2.5.38-mm3 Dipankar Sarma
2002-09-28  4:35                   ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28  4:36                     ` William Lee Irwin III [this message]
2002-09-28  4:54                       ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28  5:29                         ` 2.5.38-mm3 Dipankar Sarma
2002-09-28  4:30                 ` 2.5.38-mm3 Zwane Mwaikambo

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