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Re: [Xen-devel] [PATCH] add printf_ratelimit


On Mon, 2006-10-02 at 12:39 -0400, Steven Rostedt wrote:
> I sent this patch back on 9/19 and it never went anywhere.  I'm sending 
> it again, against the lastest unstable.

> If someone turns on verbose and/or debug the hypervisor slams the serial 
> pretty badly when starting a FV domain.  So I pulled the 
> printk_ratelimit from Linux and put it into the hypervisor.  Right now 
> the only user of it is the MEM_LOG in arch/x86/mm.c which can really 
> spit out a lot.

A *lot*.  With serial console, starting an HVM domain can take 30
seconds for me just because of these log messages.  Rate-limiting is
necessary for such cases.


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