lkml.org 
[lkml]   [2006]   [Mar]   [15]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Patch 3/9] Block I/O accounting initialization
FromArjan van de Ven <>
DateWed, 15 Mar 2006 11:27:15 +0100
> > +static inline void delayacct_blkio_start(void)> +{> +	if (unlikely(delayacct_on))> +		__delayacct_blkio_start();> +}
I still think the unlikely() makes no sense here; at runtime it's either
going to be always on or off (in the sense that switching it will be
RARE). The cpus branch predictor will get that right; while if you force
it unlikely you can even run the risk of getting a 100% miss on some
architectures (not x86/x86-64) when you enable the accounting


-
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: 2006-03-15 11:29    [from the cache]
©2003-2008