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

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Date:	Mon, 31 Aug 2009 10:59:08 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/filters: Defer pred allocation


* 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 
footprint? Instead of a rebase a merge of tracing/core into 
tracing/kprobes would be less intrusive.

	Ingo
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