Date: Fri, 31 Mar 2006 16:24:29 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: Joao Barros <joao.barros@gmail.com>, src-committers@FreeBSD.org, Peter Jeremy <peterjeremy@optushome.com.au>, "Christian S.J. Peron" <csjp@FreeBSD.org>, cvs-all@FreeBSD.org, cvs-src@FreeBSD.org Subject: Re: cvs commit: src/usr.sbin/syslogd syslogd.c Message-ID: <20060331162303.Y88223@fledge.watson.org> In-Reply-To: <20060331143300.0p3adr4h3wwkk40w@netchild.homeip.net> References: <200603302104.k2UL4qF7086165@repoman.freebsd.org> <20060331080654.GB776@turion.vk2pj.dyndns.org> <20060331090421.I9972@fledge.watson.org> <70e8236f0603310129r5fe4e3a4qd9cb329c768860cc@mail.gmail.com> <20060331102745.D88223@fledge.watson.org> <20060331143300.0p3adr4h3wwkk40w@netchild.homeip.net>
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On Fri, 31 Mar 2006, Alexander Leidinger wrote: > Robert Watson <rwatson@FreeBSD.org> wrote: > >> The cost to check for free space is the cost of a fstatfs() system call on >> the file descriptor of the log file. This should be handled without >> touching the disk, so while it's not a cheap system call compared to, say, >> getpid(), as it acquires locks and enters VFS, it's a lot cheaper than any >> disk I/O operation. Optional is good, if only because sometimes people do >> actually want logging to fill the disk, and that's been the behavior >> historically :-). > > Do you know if a kqueue based solution is cheaper? I think that before solving this problem, we should establish it is one. I'm not convinced it will be. Robert N M Watson
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