linux-kernel - Re: [PATCH 4/6] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090807080018.GD20292@elte.hu>
Date:	Fri, 7 Aug 2009 10:00:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Larry Woodman <lwoodman@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, riel@...hat.com,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 4/6] tracing, page-allocator: Add a postprocessing
	script for page-allocator-related ftrace events


* Mel Gorman <mel@....ul.ie> wrote:

> This patch adds a simple post-processing script for the 
> page-allocator-related trace events. It can be used to give an 
> indication of who the most allocator-intensive processes are and 
> how often the zone lock was taken during the tracing period. 
> Example output looks like

Note, this script hard-codes certain aspects of the output format:

+my $regex_traceevent =
+'\s*([a-zA-Z0-9-]*)\s*(\[[0-9]*\])\s*([0-9.]*):\s*([a-zA-Z_]*):\s*(.*)';
+my $regex_fragdetails = 'page=([0-9a-f]*) pfn=([0-9]*) alloc_order=([0-9]*)
+fallback_order=([0-9]*) pageblock_order=([0-9]*) alloc_migratetype=([0-9]*)
+fallback_migratetype=([0-9]*) fragmenting=([0-9]) change_ownership=([0-9])';
+my $regex_statname = '[-0-9]*\s\((.*)\).*';
+my $regex_statppid = '[-0-9]*\s\(.*\)\s[A-Za-z]\s([0-9]*).*';

the proper appproach is to parse /debug/tracing/events/mm/*/format. 
That is why we emit a format string - to detach tools and reduce the 
semi-ABI effect.

	Ingo
--
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/