From: "H. Peter Anvin" <hpa@zytor.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Erik Bosman <ebn310@few.vu.nl>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Andrea Arcangeli <andrea@cpushare.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC
Date: Sat, 12 Apr 2008 13:48:02 -0700 [thread overview]
Message-ID: <48012002.8030701@zytor.com> (raw)
In-Reply-To: <20080412124947.146865e4@laptopd505.fenrus.org>
Arjan van de Ven wrote:
>
> Hi,
>
> why did you make this a configuration option? In general it's not
> a good idea to make userspace visible ABI's (PR_* clearly is one of these)
> a CONFIG option unless there's some HUGE space saving going on.
> I don't see that here....
>
> So can you explain your rationale for making this a config option?
>
I also saw no mention about performance impact, which need to be
considered whenever *anything* is proposed to be inserted into a hot
path. It may be (heck, *should be*) that the performance impact isn't
measurable, but that needs to be positively established.
-hpa
next prev parent reply other threads:[~2008-04-12 20:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 16:55 [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC Erik Bosman
2008-04-12 19:49 ` Arjan van de Ven
2008-04-12 20:48 ` H. Peter Anvin [this message]
2008-04-12 21:05 ` Erik Bosman
2008-04-12 21:12 ` Arjan van de Ven
2008-04-13 21:51 ` Erik Bosman
2008-04-13 22:02 ` H. Peter Anvin
2008-04-14 8:42 ` Ingo Molnar
2008-04-13 22:24 ` [PATCH 2/3-REVISED] " Erik Bosman
2008-04-14 3:58 ` Arjan van de Ven
2008-04-14 8:48 ` Ingo Molnar
2008-04-14 10:57 ` [PATCH 2/3] " Michael Kerrisk
2008-04-14 11:59 ` Erik Bosman
2008-04-14 12:21 ` Michael Kerrisk
2008-04-26 22:47 ` dean gaudet
2008-04-26 22:51 ` H. Peter Anvin
2008-04-26 23:14 ` dean gaudet
2008-04-26 23:46 ` H. Peter Anvin
2008-04-27 0:29 ` dean gaudet
2008-04-27 0:37 ` H. Peter Anvin
2008-04-27 0:47 ` David Miller
2008-04-15 7:29 ` Andrew Morton
2008-04-15 7:46 ` Ingo Molnar
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