[lkml]   [2007]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [rfc][patch 2/2] x86_64: FIFO ticket spinlocks
On Mon, Jul 16, 2007 at 11:26:46AM +0200, Ingo Molnar wrote:
> * Nick Piggin <> wrote:
> > [...] trylock is more significantly slower, but they are relatively
> > rare.
> trylock is the main thing that the spinlock debugging code uses, and
> SPINLOCK_DEBUG is frequently enabled by distro kernels. OTOH, the cost
> looks like to be +5 instructions, right? Still ...

Which trylocks do you mean? The lockbreak spinlocks use trylock, but
those are not used with the ticket version.

I wouldn't be against adding an option between either of the lock
types, if there was value in it. But I would like to default ticket
locks to "y", at least in -rc kernels, in order to see if performance
goes down anywhere.
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: 2007-07-16 11:47    [W:0.033 / U:2.960 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site