Re: [PATCH] don't use ld.bias

From: Matthew Wilcox <>
Date: 2003-07-23 22:00:15
On Tue, Jul 22, 2003 at 09:40:02PM -0700, Mallick, Asit K wrote:
> It does make sense to not use the ld.bias in the spinlock, it will make
> more cacheline bouncing in a larger SMP system.

it certainly makes a mockery of the comment:

 * Streamlined test_and_set_bit(0, (x)).  We use test-and-test-and-set
 * rather than a simple xchg to avoid writing the cache-line when
 * there is contention.

since there's no real advantage (AIUI) to have the cacheline
clean-exclusive vs dirty-exclusive.

but why not delete this code?  it's under #else /* !NEW_LOCK */ and
NEW_LOCK looks to be the better code as well as the default in 2.5.

"It's not Hollywood.  War is real, war is primarily not about defeat or
victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to
More majordomo info at
Received on Wed Jul 23 08:02:30 2003

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:16 EST