From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
"Martin J. Bligh" <mbligh@aracnet.com>,
mingo@elte.hu, kernel@kolivas.org, linux-kernel@vger.kernel.org,
piggin@cyberone.com.au, akpm@osdl.org, wli@holomorphy.com,
markw@osdl.org
Subject: Re: [PATCH] Performance regression in 2.6.7-rc3
Date: Wed, 16 Jun 2004 13:18:51 +1000 [thread overview]
Message-ID: <40CFBC1B.6000400@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.58.0406152009220.4142@ppc970.osdl.org>
Linus Torvalds wrote:
>
> On Wed, 16 Jun 2004, Nick Piggin wrote:
>
>>I think balance on clone probably needs to be turned off by default
>>presently.
>>
>>It slows down a simple thread creation test by a factor of 7(!) here,
>>and has quite a few not too difficult to imagine performance problems.
>
>
> I agree. However, I still think we should do my suggested
> "wake_up_new(p,clone_flags)" thing, and then have the logic on whether to
> try to care about threading or not be in schedule.c, not in kernel/fork.c.
>
> The fact is, fork.c shouldn't try to make scheduling decisions. But it
> could inform the scheduler about the new process, and THAT can then make
> the decisions.
>
I agree, it is a fine suggestion. Would be a trivial change, and
would clean things up nicely.
next prev parent reply other threads:[~2004-06-16 3:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-12 0:28 [PATCH] Performance regression in 2.6.7-rc3 Con Kolivas
2004-06-12 7:58 ` Nick Piggin
2004-06-15 4:56 ` Ingo Molnar
2004-06-15 13:11 ` Con Kolivas
2004-06-15 15:02 ` Martin J. Bligh
2004-06-16 2:14 ` Herbert Xu
2004-06-16 3:05 ` Nick Piggin
2004-06-16 3:10 ` Linus Torvalds
2004-06-16 3:18 ` Nick Piggin [this message]
2004-06-16 7:02 ` Ingo Molnar
2004-06-16 3:09 ` Linus Torvalds
2004-06-16 14:54 ` Martin J. Bligh
2004-06-16 3:00 ` Nick Piggin
2004-06-16 1:22 ` Con Kolivas
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