svn commit: r39189 - head/en_US.ISO8859-1/books/porters-handbook

[Chris Rees]

On Jul 12, 2012 4:06 PM, "Konstantin Belousov" <kostikbel at gmail.com> wrote:
>
> On Thu, Jul 12, 2012 at 02:12:49PM +0000, Isabell Long wrote:
> > Author: issyl0
> > Date: Thu Jul 12 14:12:49 2012
> > New Revision: 39189
> > URL: http://svn.freebsd.org/changeset/doc/39189
> >
> > Log:
> >   Add a section to the Dos and Don'ts section of the porter's handbook
> >   about avoiding Linuxisms.
>
> > +      <para>A number of simple syscalls (for example
> > +     &man.gettimeofday.2;, &man.getpid.2;) are much faster on
> > +     &linux; than on any other operating system due to caching and
> > +     the vsyscall performance optimizations.  Do not rely on them
> > +     being cheap in performance-critical applications.  In general,
> > +     try hard to avoid syscalls if possible.</para>
> And this is not quite true for HEAD and soon for RELENG_9.

Quite true, so there are others that may be more true.  What syscalls
remain that are expensive for us that could be used as examples?

Chris