lkml.org 
[lkml]   [2005]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [ANNOUNCE] ktimers subsystem
From
Date
On Sun, 2005-09-25 at 01:45 +0200, Roman Zippel wrote:

> > The backward conversion from nsec_t to timespec is almost a non issue.
> > The vast majority of callers dont provide the second argument to
> > nanosleep(), setitimer(), set_timer() which makes the conversion
> > necessary and I think we optimize for the common use case.
>
> You know very well, that the conversion back to timespec is the killer in
> your calculation. You graciously decide that the "vast majority" doesn't
> want to read the timer, how did you get to that conclusion?

I graciously put instrumentation into _all_ the relevant syscalls on a
desktop and a server machine. The result is that less than 1% of the
calls provide the read back variable.

tglx


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-09-25 23:02    [W:0.188 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site