linux-kernel - Re: [PATCH] tracing/function-graph-tracer: support for x86-64

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Message-ID: <20081202090556.GA12479@elte.hu>
Date:	Tue, 2 Dec 2008 10:05:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Tim Bird <tim.bird@...sony.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Alexander van Heukelum <heukelum@...lshack.com>
Subject: Re: [PATCH] tracing/function-graph-tracer: support for x86-64


* Ingo Molnar <mingo@...e.hu> wrote:

> > This patch implements the support for function graph tracer under 
> > x86-64. Both static and dynamic tracing are supported.
> 
> Fantastic stuff! :-)

Graph tracer output from a 64-bit testbox:

 0)               |                cache_grow() {
 0)      0.323 us |                  _spin_lock();
 0)      0.314 us |                  kmem_flagcheck();
 0)               |                  kmem_getpages() {
 0)               |                    __alloc_pages_internal() {
 0)               |                      get_page_from_freelist() {
 0)      0.295 us |                        next_zones_zonelist();
 0)      0.306 us |                        next_zones_zonelist();
 0)      0.394 us |                        zone_watermark_ok();
 0)      0.415 us |                        _spin_lock_irqsave();
 0)               |                        __rmqueue() {
 0)               |                          __rmqueue_smallest() {
 0)      0.387 us |                            __mod_zone_page_state();
 0)      1.514 us |                          }
 0)      2.369 us |                        }
 0)               |                        zone_statistics() {
 0)      0.297 us |                          __inc_zone_state();
 0)      0.290 us |                          __inc_zone_state();
 0)      1.448 us |                        }
 0)      7.315 us |                      }
 0)      7.967 us |                    }
 0)               |                    mod_zone_page_state() {
 0)      0.285 us |                      __mod_zone_page_state();
 0)      0.931 us |                    }
 0)      9.993 us |                  }
 0)               |                  kmem_cache_alloc_node() {
 0)               |                    cache_alloc_refill() {

nice :)

	Ingo
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