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Date: Wed, 23 May 2007 11:57:16 +0200 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: linux-kernel@...r.kernel.org Cc: Ingo Molnar <mingo@...e.hu>, Bill Huey <billh@...ppy.monkey.org>, Jason Baron <jbaron@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, Christoph Hellwig <hch@...radead.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: [PATCH 0/7] lock contention tracking -v2 Use the lockdep infrastructure to track lock contention and other lock statistics. It tracks lock contention events, and the first four unique call-sites that encountered contention. It also measures lock wait-time and hold-time in nanoseconds. The minimum and maximum times are tracked, as well as a total (which together with the number of event can give the avg). All statistics are done per lock class, per write (exclusive state) and per read (shared state). The statistics are collected per-cpu, so that the collection overhead is minimized via having no global cachemisses. This new lock statistics feature is independent of the lock dependency checking traditionally done by lockdep; it just shares the lock tracking code. It is also possible to enable both and runtime disabled either component - thereby avoiding the O(n^2) lock chain walks for instance. TODO: - create new output format -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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