Messages in this thread | | | Date | Mon, 23 Sep 2002 01:02:46 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [ltt-dev] Re: [PATCH] LTT for 2.5.38 1/9: Core infrastructure |
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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.)
Ingo
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