linux-kernel - Re: [PATCH] tracing/filters: Defer pred allocation

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Message-ID: <4A9D1A85.4000503@redhat.com>
Date:	Tue, 01 Sep 2009 08:58:45 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Li Zefan <lizf@...fujitsu.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/filters: Defer pred allocation



Li Zefan wrote:
> Ingo Molnar wrote:
>> * Li Zefan <lizf@...fujitsu.com> wrote:
>>
>>> init_preds() allocates about 5392 bytes of memory (on x86_32) for
>>> a TRACE_EVENT. With my config, at system boot total memory occupied
>>> is:
>>>
>>> 	5392 * (642 + 15) == 3459KB
>>>
>>> 642 == cat available_events | wc -l
>>> 15 == number of dirs in events/ftrace
>>>
>>> That's quite a lot, so we'd better defer memory allocation util
>>> it's needed, that's when filter is used.
>>>
>>> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>>
>> Applied, thanks!
>>
>>> tracing/kprobe needs rebase after this patch..
>>
>> You mean with many probes registered it has a lot of memory 
> 
> I think so, if filter is used.
> 
>> footprint? Instead of a rebase a merge of tracing/core into 
>> tracing/kprobes would be less intrusive.
>>
> 
> Yeah, I meant this patch conflicts with some patches in
> tracing/kprobe. :)

Sure, that should be a small change. :-)

Thank you!

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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