[systemd-devel] Reduce unit-loading time

[Lennart Poettering]

On Tue, 26.05.15 09:49, Filipe Brandenburger (filbranden at google.com) wrote:

> Hi,
> 
> On Sun, May 24, 2015 at 8:41 PM, cee1 <fykcee1 at gmail.com> wrote:
> > I tried ureadahead, but got following error:
> >
> > """write(2, "ureadahead: Error while tracing:"..., 59ureadahead: Error
> > while tracing: No such file or directory"""
> >
> > Needs an out-of-tree kernel patch?
> 
> Yes, ureadahead needs an out-of-tree kernel patch to add trace events
> for open(), exec() and uselib() syscalls that take file paths.
> 
> http://bugs.launchpad.net/bugs/462111
> 
> AFAICT, this never went upstream because upstream was discussing a
> generic approach of tracing any system calls, but I believe that never
> really panned out...

systemd-readahead used fanotify() which requires no kernel
patching. fanotify is completely generic and perfect for this
purpose...

Lennart

-- 
Lennart Poettering, Red Hat