[lkml]   [2005]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] remove redundant NULL pointer checks prior to calling kfree() in fs/nfsd/
On Fri, 2005-03-25 at 17:34 -0500, linux-os wrote:
> On Fri, 25 Mar 2005, Jesper Juhl wrote:
> > (please keep me on CC)
> >
> >
> > checking for NULL before calling kfree() is redundant and needlessly
> > enlarges the kernel image, let's get rid of those checks.
> >
> Hardly. ORing a value with itself and jumping on condition is
> real cheap compared with pushing a value into the stack

which century are you from?
"jumping on condition" can easily be 100+ cycles, depending on how
effective the branch predictor is. Pushing a value onto the stack otoh
is half a cycle.

Your argument was right probably in 1994, when cpus didn't do
speculation and out of order execution...

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-04-06 13:30    [W:0.045 / U:9.104 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site