Messages in this thread | | | Date | Wed, 24 Sep 2008 02:59:37 +0900 (JST) | From | KOSAKI Motohiro <> | Subject | Re: Unified tracing buffer |
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> > I can't imazine a merit of the single-channel mode. > > Could you please explain it? > > Actually, single-channel mode is for not-frequently event tracing. > At least systemtap case, sometimes we just want to collect data > and watch it periodically(as like as 'top'). Or, just monitoring > errors as additional printk. in these cases, overhead is not so > important. > > I think the main reason of using single-channel mode is simplicity of > userspace reader. We can use 'cat' or 'tail' to read the buffer on-line. > I'm not sure how much overhead ftrace-like buffer merging routine has, > but if kernel provides an interface which gives us single-merged buffer > image(like ftrace buffer), we are grad to use it. :-)
Yup, I also think it is better.
Thanks.
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