On Mon, 2009-09-14 at 20:23 +0200, Peter Zijlstra wrote: > On Mon, 2009-09-14 at 14:17 -0400, Steven Rostedt wrote: > > Frederic, how big can one of those events get. The ring buffer (and > > TRACE_EVENT) allow up to almost a page size, which is very hefty for the > > stack. This code needs to either be rewritten or we need to set a limit > > to the size of a profile entry. > > Yeah, that needs to get a re-write.. I've complained about this when it > went in. One answer is to create a per cpu buffer that is big enough to hold the data needed. Then you can disable interrupts an use it without worry. If you need to also handle NMIs, then create a per_cpu NMI buffer too, and use that if "in_nmi()" is true. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
