From: David Miller <davem@davemloft.net>
To: paulus@samba.org
Cc: hch@infradead.org, akpm@linux-foundation.org, gregkh@suse.de,
mucci@cs.utk.edu, eranian@hpl.hp.com, wcohen@redhat.com,
robert.richter@amd.com, linux-kernel@vger.kernel.org,
andi@firstfloor.org
Subject: Re: [perfmon] Re: [perfmon2] perfmon2 merge news
Date: Wed, 14 Nov 2007 04:07:58 -0800 (PST) [thread overview]
Message-ID: <20071114.040758.101673950.davem@davemloft.net> (raw)
In-Reply-To: <18234.58380.400222.329961@cargo.ozlabs.ibm.com>
From: Paul Mackerras <paulus@samba.org>
Date: Wed, 14 Nov 2007 23:03:24 +1100
> You're suggesting that the behaviour of a read() should depend on what
> was in the buffer before the read? Gack! Surely you have better
> taste than that?
Absolutely that's what I mean, it's atomic and gives you exactly what
you need.
I see nothing wrong or gross with these semantics. Nothing in the
"book of UNIX" specifies that for a device or special file the passed
in buffer cannot contain input control data.
> > Another alternative is to use generic netlink.
>
> Then you end up with two system calls to get the data rather than one
> (one to send the request and another to read the reply). For
> something that needs to be quick that is a suboptimal interface.
Not necessarily, consider the possibility of using recvmsg() control
message data. With that it could be done in one go.
This also suggests that it could be implemented as it's own protocol
family.
next prev parent reply other threads:[~2007-11-14 12:08 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 0:34 [PATCH] fix up perfmon to build on -mm Greg KH
2007-11-07 10:34 ` Stephane Eranian
2007-11-07 17:07 ` Greg KH
2007-11-07 13:42 ` Stephane Eranian
2007-11-07 17:08 ` Greg KH
2007-11-07 17:33 ` Andrew Morton
2007-11-07 17:41 ` Greg KH
2007-11-07 17:50 ` Stephane Eranian
2007-11-07 17:47 ` Greg KH
2007-11-07 17:57 ` Stephane Eranian
2007-11-07 19:53 ` Greg KH
2007-11-07 20:39 ` Stephane Eranian
2007-11-08 15:27 ` Stephane Eranian
2007-11-09 20:06 ` Andrew Morton
2007-11-09 21:38 ` Greg KH
2007-11-10 20:32 ` Andi Kleen
2007-11-13 15:17 ` perfmon2 merge news Robert Richter
2007-11-13 15:35 ` [perfmon2] " William Cohen
2007-11-13 17:55 ` Stephane Eranian
2007-11-13 18:33 ` [perfmon] " William Cohen
2007-11-13 21:13 ` Stephane Eranian
2007-11-13 21:29 ` Andi Kleen
2007-11-13 21:46 ` Stephane Eranian
2007-11-13 21:50 ` Andi Kleen
2007-11-13 22:22 ` Stephane Eranian
2007-11-13 22:25 ` Andi Kleen
2007-11-13 22:58 ` Stephane Eranian
2007-11-14 2:07 ` Andi Kleen
2007-11-14 13:09 ` Stephane Eranian
2007-11-14 14:24 ` Andi Kleen
2007-11-14 15:44 ` William Cohen
2007-11-14 16:13 ` Stephane Eranian
2007-11-14 18:53 ` Philippe Elie
2007-11-14 19:15 ` Andi Kleen
2007-11-15 0:07 ` Stephane Eranian
2007-11-13 18:47 ` Philip Mucci
2007-11-13 18:59 ` Greg KH
2007-11-13 20:07 ` Andrew Morton
2007-11-13 20:14 ` Greg KH
2007-11-13 20:36 ` Andi Kleen
2007-11-14 0:28 ` Philip Mucci
2007-11-14 1:52 ` Andi Kleen
2007-11-16 9:18 ` Philip Mucci
2007-11-16 15:15 ` Andi Kleen
2007-11-16 16:00 ` Stephane Eranian
2007-11-16 16:28 ` Andi Kleen
2007-11-16 17:13 ` William Cohen
2007-11-16 21:56 ` Stephane Eranian
2007-11-16 17:36 ` Stephane Eranian
2007-11-16 17:51 ` dean gaudet
2007-11-17 0:29 ` David Miller
2007-11-17 1:07 ` Greg KH
2007-11-16 20:16 ` Philip Mucci
2007-11-17 0:15 ` David Miller
[not found] ` <1d7226b10711161713j675341b7wdb4f050c59a8be0a@mail.gmail.com>
2007-11-17 1:25 ` Greg KH
[not found] ` <1d7226b10711161748n39b7f195q796d85282ef66134@mail.gmail.com>
2007-11-17 2:13 ` Greg KH
2007-11-14 7:24 ` [perfmon] Re: [perfmon2] " Paul Mackerras
2007-11-14 7:40 ` Andrew Morton
2007-11-14 10:38 ` Christoph Hellwig
2007-11-14 10:43 ` Paul Mackerras
2007-11-14 11:00 ` Christoph Hellwig
2007-11-14 11:12 ` David Miller
2007-11-14 11:14 ` David Miller
2007-11-14 11:44 ` Paul Mackerras
2007-11-13 23:49 ` Nick Piggin
2007-11-14 11:58 ` David Miller
2007-11-14 0:25 ` Nick Piggin
2007-11-14 21:30 ` Paul Mackerras
2007-11-14 10:17 ` Nick Piggin
2007-11-14 22:56 ` Chuck Ebbert
2007-11-14 11:03 ` Nick Piggin
2007-11-14 11:52 ` David Miller
2007-11-14 12:03 ` Paul Mackerras
2007-11-14 12:07 ` David Miller [this message]
2007-11-14 0:28 ` Nick Piggin
2007-11-14 21:50 ` Paul Mackerras
2007-11-14 23:03 ` David Miller
2007-11-14 23:12 ` Paul Mackerras
2007-11-14 23:21 ` David Miller
2007-11-15 1:11 ` Paul Mackerras
2007-11-15 1:27 ` David Miller
2007-11-15 2:34 ` Paul Mackerras
2007-11-15 7:48 ` Herbert Xu
2007-11-15 8:19 ` Andi Kleen
2007-11-19 13:08 ` David Miller
2007-11-19 20:53 ` Stephane Eranian
2007-11-20 0:55 ` David Miller
2007-11-19 21:43 ` Paul Mackerras
2007-11-19 22:48 ` Stephane Eranian
2007-11-20 0:53 ` David Miller
2007-12-13 16:00 ` Stephane Eranian
2007-12-14 19:12 ` Frank Ch. Eigler
2007-12-14 21:07 ` Stephane Eranian
2007-12-15 15:54 ` Frank Ch. Eigler
2007-11-15 8:29 ` [perfmon] " Stephane Eranian
2007-11-14 13:51 ` Stephane Eranian
2007-11-14 11:39 ` Paul Mackerras
2007-11-14 11:52 ` David Miller
2007-11-14 13:47 ` Stephane Eranian
2007-11-14 12:38 ` Andi Kleen
2007-11-14 14:13 ` Stephane Eranian
2007-11-14 14:26 ` Andi Kleen
2007-11-15 0:23 ` Paul Mackerras
2007-11-14 19:48 ` David Miller
2007-11-15 4:20 ` dean gaudet
2007-11-15 4:47 ` Paul Mackerras
2007-11-15 5:14 ` dean gaudet
2007-11-15 8:53 ` Stephane Eranian
2007-11-15 17:01 ` [perfmon2] [perfmon] " Dan Terpstra
2007-11-13 21:33 ` [perfmon] Re: [perfmon2] " Stephane Eranian
2007-11-13 21:45 ` Greg KH
2007-11-13 22:27 ` Christoph Hellwig
2007-11-13 20:42 ` Andi Kleen
2007-11-13 18:32 ` Stephane Eranian
2007-11-13 22:29 ` Christoph Hellwig
2007-11-16 18:25 ` PMC core internal API design Mathieu Desnoyers
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