On Mon, 2010-09-13 at 21:34 +0200, Peter Zijlstra wrote: > On Mon, 2010-09-13 at 15:31 -0400, Mathieu Desnoyers wrote: > > > Ok, so can we play the same trick you're playing with the sampling > > > buffer, i.e., you use alloc_pages_node() for one page at a time, and > > > then you stitch them on demand via SW? > > > > Well, a thought is striking me: it sounds like you are re-doing YAORB (short > > for Yet Another Ring Buffer, > > He's not.. the hardware needs a large (virtually) contiguous region to > poke data into, we need to read it out from NMI context.
Which just made me realize, we really need vmalloc_sync_all() for this, the hardware will want to walk the pagetables as well, it cannot lazy fault the pages in. ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
