From: Ingo Molnar <mingo@elte.hu>
To: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Tom Zanussi <tzanussi@gmail.com>,
Masami Hiramatsu <mhiramat@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] tracing/filters: Defer pred allocation
Date: Mon, 31 Aug 2009 10:59:08 +0200 [thread overview]
Message-ID: <20090831085908.GA656@elte.hu> (raw)
In-Reply-To: <4A9B8EA5.6020700@cn.fujitsu.com>
* Li Zefan <lizf@cn.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@cn.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
next prev parent reply other threads:[~2009-08-31 8:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-31 8:49 [PATCH] tracing/filters: Defer pred allocation Li Zefan
2009-08-31 8:59 ` Ingo Molnar [this message]
2009-08-31 9:06 ` Li Zefan
2009-09-01 12:58 ` Masami Hiramatsu
2009-08-31 9:00 ` [tip:tracing/core] " tip-bot for Li Zefan
2009-08-31 17:41 ` [PATCH] " Frederic Weisbecker
2009-09-01 0:50 ` Li Zefan
2009-09-01 5:31 ` [PATCH] tracing/filters: Defer pred allocation, fix memory leak Li Zefan
2009-09-01 9:32 ` Frederic Weisbecker
2009-09-06 4:36 ` [tip:tracing/core] " tip-bot for Li Zefan
2009-09-01 3:28 ` [PATCH] tracing/filters: Defer pred allocation Tom Zanussi
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