From: Mikael Pettersson <mikpe@csd.uu.se>
To: Andrew Morton <akpm@osdl.org>
Cc: Christoph Hellwig <hch@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][1/6] perfctr-2.7.3 for 2.6.7-rc1-mm1: core
Date: Tue, 22 Jun 2004 16:38:06 +0200 [thread overview]
Message-ID: <16600.17486.81041.111276@alkaid.it.uu.se> (raw)
In-Reply-To: <20040622022023.1942fd82.akpm@osdl.org>
Andrew Morton writes:
> Christoph Hellwig <hch@infradead.org> wrote:
> >
> > On Tue, Jun 22, 2004 at 02:14:41AM -0700, Andrew Morton wrote:
> > > > Let's ressurect that code instead of doing the syscall approach.
> > >
> > > This appears to have come out of the blue. Please explain why you think
> > > this change is needed.
> >
> > Just read through all the old perfctr threads. This was discussed multiple
> > times.
>
> Well it didn't register with me and either it didn't register with Mike, or
> he rejected the notion.
>
> Please restate the case.
Swiching to open() on /proc/<pid>/<tid>/perfctr followed by ioctl()s
would be easy to implement. But people @ LKML are sometimes violently
opposed to ioctl()s, that's why the switch to syscalls happended.
One concern is that there doesn't appear to be a user-visible shortcut
to "your own" /proc/<pid>/<tid>/ like there was when /proc/self still
had some useful meaning. This is merely annoying, not a show-stopper.
next prev parent reply other threads:[~2004-06-22 14:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-31 22:18 Mikael Pettersson
2004-06-22 8:53 ` Andrew Morton
2004-06-22 8:59 ` Christoph Hellwig
2004-06-22 9:04 ` Andrew Morton
2004-06-22 9:12 ` Christoph Hellwig
2004-06-22 9:14 ` Andrew Morton
2004-06-22 9:18 ` Christoph Hellwig
2004-06-22 9:20 ` Andrew Morton
2004-06-22 14:38 ` Mikael Pettersson [this message]
2004-06-22 17:20 ` Christoph Hellwig
2004-06-22 20:35 ` Mikael Pettersson
2004-06-22 13:47 ` Mikael Pettersson
2004-06-22 19:18 ` Andrew Morton
2004-06-22 13:59 ` Mikael Pettersson
2004-06-22 19:22 ` Andrew Morton
[not found] <223si-461-9@gated-at.bofh.it>
[not found] ` <29Piu-4H4-27@gated-at.bofh.it>
2004-06-22 10:21 ` Andi Kleen
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