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

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Message-ID: <c62985530812020403ve8fff04w17c0b5a3e88dab19@mail.gmail.com>
Date:	Tue, 2 Dec 2008 13:03:26 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
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

2008/12/2 Ingo Molnar <mingo@...e.hu>:
> 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
>

:-)

Yesterday, I noticed some rare and weird things like this:

leaf_func();
leaf_func();
leaf_func();
leaf_func() {
leaf_func();
leaf_func();

I'm not sure of the origin. I will investigate....
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