Date: Sun, 05 Sep 2004 22:37:31 +0200 From: Christian Brueffer <chris@unixpages.org> To: Alan Cox <alc@cs.rice.edu> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/lib/libc/sys msync.2 Message-ID: <20040905203730.GH66117@unixpages.org> In-Reply-To: <20040905194632.GK10220@cs.rice.edu> References: <200409030624.i836OPaL018916@repoman.freebsd.org> <20040905194632.GK10220@cs.rice.edu>
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On Sun, Sep 05, 2004 at 02:46:32PM -0500, Alan Cox wrote:
> On Sat, Sep 04, 2004 at 09:30:43PM -0400, David Schultz wrote:
> > On Fri, Sep 03, 2004, Peter Pentchev wrote:
> > > roam 2004-09-03 06:24:25 UTC
> > >=20
> > > FreeBSD src repository (doc,ports committer)
> > >=20
> > > Modified files:
> > > lib/libc/sys msync.2=20
> > > Log:
> > > Add a BUGS section and copy the wording from mmap(2)'s MAP_NOSYNC,
> > > documenting the obsoleteness of the msync(2) syscall and its single
> > > remaining purpose.
> >=20
> > I'm not nitpicking at you since you didn't write the original
> > text, but if msync(2) still has a purpose, then it isn't really
> > obsolete, is it? (Moreover, the text only describes the purpose of
> > msync(2) with the MS_ASYNC flag.) Applications such as databases
> > that want greater control over the flushing of dirty data may
> > still find msync(2) very useful.
>=20
> I agree. This sentence should be removed from both msync.2 and mmap.2
> for precisely the reason you state.
>=20
> It is, however, worth mentioning that FreeBSD has a unified buffer and
> virtual memory page cache in these man pages. In fact, that does make
> most uses of msync()'s MS_INVALIDATE flag unnecessary. (The useful cases
> being things like the extension used by the Nvidia driver.)
>=20
> On a related note, where do we stand with respect to the use of X/Open
> man pages? The X/Open man page for msync(2) is much better than ours.
>=20
"The IEEE and The Open Group have granted permission to the FreeBSD
Project to incorporate material from the joint IEEE 1003.1\x{2122}
POSIX=AE standard and The Open Group Base Specifications Issue 6."
http://www.opengroup.org/press/01jun04.htm
- Christian
--=20
Christian Brueffer chris@unixpages.org brueffer@FreeBSD.org
GPG Key: http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B B29B 6C76 178C A0ED 982D
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