Date: Fri, 31 Mar 2006 08:00:32 -0600 (CST) From: Sergey Babkin <babkin@verizon.net> To: Alexander Leidinger <Alexander@Leidinger.net>, Robert Watson <rwatson@FreeBSD.org> 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: Re: cvs commit: src/usr.sbin/syslogd syslogd.c Message-ID: <2893454.4353801143813632253.JavaMail.root@vms169.mailsrvcs.net>
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>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? Probably should not matter. Syslog writes data to disk synchronously, right? So anything not involving a disk access is negligible in cost compared to the main action of writing the log entry. -SB
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