Date: Thu, 03 Apr 2014 13:34:38 -0600 From: Ian Lepore <ian@FreeBSD.org> To: Dmitry Sivachenko <trtrmitya@gmail.com> Cc: freebsd-hackers@FreeBSD.org, Trond =?ISO-8859-1?Q?Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> Subject: Re: madvise() vs posix_fadvise() Message-ID: <1396553678.81853.288.camel@revolution.hippie.lan> In-Reply-To: <2CB392D0-5198-41EB-8191-8B02FE432334@gmail.com> References: <D6BD48AF-9522-495D-8D54-37854E53C272@gmail.com> <201404031102.38598.jhb@freebsd.org> <1396539837.81853.278.camel@revolution.hippie.lan> <201404031230.40380.jhb@freebsd.org> <2CB392D0-5198-41EB-8191-8B02FE432334@gmail.com>
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On Thu, 2014-04-03 at 23:10 +0400, Dmitry Sivachenko wrote: > On 03 Сав. 2014 Ч., at 20:30, John Baldwin <jhb@FreeBSD.org> wrote: > > > > > The latter. It's sort of like a lazy O_DIRECT. Each time you call write(2), > > it tries to move any clean pages from your current sequentially written > > stream from inactive to cache, so the pages won't move until a subsequent > > write(2) after bufdaemon or the syncer actually forces them to be written. > > Unfortunately, it is currently implemented by doing an internal > > FADV_DONTNEED after each read() or write(). It would be better if it was > > implemented as a callback when buffers are completed. > > > > Sounds like FADV_NOREUSE should be befeficial for any log-writing program? (syslogd, apache, nginx, .....) I'll probably do something with syslogd soon-ish, it'll help our embedded products at $work that are tight on memory already. -- Ianhelp
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