linux-kernel - [UPDATE] Performance analysis of Linux Kernel Markers 0.20 for 2.6.17

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Date:	Mon, 2 Oct 2006 10:31:38 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Karim Yaghmour <karim@...rsys.com>,
	Pavel Machek <pavel@...e.cz>, Joe Perches <joe@...ches.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	"Jose R. Santos" <jrs@...ibm.com>
Subject: [UPDATE] Performance analysis of Linux Kernel Markers 0.20 for 2.6.17

Here are two minor corrections of my results :

* Mathieu Desnoyers (compudj@...stal.dyndns.org) wrote:
[...]
> * Micro-benchmarks
[...]
> The following tests are done with the "optimized" markers only
>
[...]
> - Execute a loop with a marker enabled, with an empty probe. Var args argument
>   setup, probe empty. No preemption disabling.
> NR_LOOPS : 100000
> time delta (cycles): 3363450
> cycles per loop : 33.63
- cycles per loop to disable preemption : 44.08-33.63=10.45
+ cycles per loop to disable preemption : 52.11-33.63=18.48
[...]
> * Size (x86)
> 
> This is the size added by each marker to the memory image :
> 
> - Optimized
> 
> .text section : instructions
> Adds 6 bytes in the "likely" path.
> Adds 32 bytes in the "unlikely" path.
> .data section : r/w data
> 0 byte
+ 4 bytes for the call address
> .rodata.str1 : strings
> Length of the marker name
> .debug_str : strings (if loaded..)
> Length of the marker name + 7 bytes (__mark_)
> .markers
> 8 bytes (2 pointers)
> .markers.c
> 12 bytes (3 pointers)
> 
> - Generic
> 
> .text section : instructions
> Adds 11 bytes in the "likely" path.
> Adds 32 bytes in the "unlikely" path.
> .data section : r/w data
> 1 byte (the activation flag)
+ 4 bytes for the call address
> .rodata.str1 : strings
> Length of the marker name
> .debug_str : strings (if loaded..)
> Length of the marker name + 7 bytes (__mark_)
> .markers
> 8 bytes (2 pointers)
> .markers.c
> 12 bytes (3 pointers)
> 


Mathieu


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