Messages in this thread |  | | | Date | Sat, 07 Jun 2008 03:13:01 +0200 | | From | Andi Kleen <> | | Subject | Re: [PATCH 2.6.25-4] getdelays.c: signal handling for log rotation |
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Scott Wiersdorf wrote: > On Fri, Jun 06, 2008 at 03:59:09PM +0200, Andi Kleen wrote: >> Scott Wiersdorf <scott@perlcode.org> writes: >> >>> This adds a USR1 signal handler to getdelays.c, which causes getdelays >>> to close its logfile and reopen it (if '-w logfile' is >>> specified). This is useful in situations when getdelays is running for >>> a long time (i.e, the log file growing) and you need to rotate the >>> logs but don't want to lose any log data. >> You could do the same by sending SIGSTOP; copy file; truncate file; SIGCONT > > Actually, I was wrong in my previous reply. Sorry for my error. The > above will work fine (no data loss; I guess the data queues somewhere > in some magic way?)
netlink has a socket buffer like all other buffer. I think it's around 128K.
> I still think a single handler is elegant enough though, and works > better with many log rotation systems that want to send a single > signal to a pid (it's what we need where I'm working now, hence the > patch).
Well in general it would be cool if there was nicer free userland for the obscure but useful delay accounting. The code in Documentation is really not much more than a example. Do you have something downloadable?
-Andi
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