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
WARNING: multiple messages have this Message-ID (diff)
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
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next prev parent reply other threads:[~2002-09-28 4:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-26 7:57 2.5.38-mm3 Andrew Morton
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 12:24 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:29 ` 2.5.38-mm3 William Lee Irwin III
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 12:40 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 12:42 ` 2.5.38-mm3 William Lee Irwin III
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 13:05 ` 2.5.38-mm3 Dipankar Sarma
2002-09-26 13:17 ` 2.5.38-mm3 William Lee Irwin III
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 13:29 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:39 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:39 ` 2.5.38-mm3 William Lee Irwin III
2002-09-26 13:46 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-26 13:46 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-27 8:27 ` 2.5.38-mm3 Dipankar Sarma
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 9:20 ` 2.5.38-mm3 William Lee Irwin III
2002-09-27 9:58 ` 2.5.38-mm3 Dipankar Sarma
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 15:04 ` 2.5.38-mm3 Martin J. Bligh
2002-09-27 17:14 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 17:14 ` 2.5.38-mm3 Dipankar Sarma
2002-09-27 22:54 ` 2.5.38-mm3 William Lee Irwin III
2002-09-27 22:54 ` 2.5.38-mm3 William Lee Irwin III
2002-09-28 5:41 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 5:41 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 4:35 ` 2.5.38-mm3 Zwane Mwaikambo
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 4:36 ` 2.5.38-mm3 William Lee Irwin III
2002-09-28 4:54 ` 2.5.38-mm3 Zwane Mwaikambo
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 5:29 ` 2.5.38-mm3 Dipankar Sarma
2002-09-28 4:30 ` 2.5.38-mm3 Zwane Mwaikambo
2002-09-28 4:30 ` 2.5.38-mm3 Zwane Mwaikambo
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