Re: [ltt-dev] Re: [PATCH] LTT for 2.5.38 1/9: Core infrastructure

From: Ingo Molnar (
Date: Sun Sep 22 2002 - 18:02:46 EST

On Sun, 22 Sep 2002, bob wrote:

> [...] On a technical note: a cache-line ping-ponging is bad - a global
> spinlock is horrendous. They're different - the lock-less MP scheme gets
> rid of them both.

(on the contrary - a global spinlock is bad for exactly that reason,
because it causes a cacheline ping-pong. So if two CPUs are trying to
write trace events at once, you'll get the same effect as if they were
using a global spinlock.)


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This archive was generated by hypermail 2b29 : Mon Sep 23 2002 - 22:00:37 EST