Re: [PATCH] tracing/filters: Defer pred allocation

Li Zefan
2009-08-31T09:08:08Z

Ingo Molnar wrote:
> * 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

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. :)