Re: kvmmmu tracing
From: Avi Kivity
Date: Tue Nov 24 2009 - 05:34:40 EST
On 11/24/2009 12:05 PM, Johannes Berg wrote:
On Tue, 2009-11-24 at 11:50 +0200, Avi Kivity wrote:
On 11/23/2009 01:06 PM, Johannes Berg wrote:
Commit f691fe1da7e2715137d21ae5a80bec64db4625db is really broken wrt.
the userspace interface for tracing because of the weird
KVM_MMU_PAGE_PRINTK macro.
Can you explain what is wrong with it?
It's a big C expression that trace-cmd can't parse :)
Um, C can be easily parsed with a C compiler. I don't think you can
expect it to be a plain format string and argument list.
Is userspace reading mmutrace.h? When the structure attributes can be
exported via /sys/kernel/debug/tracing?
Yes ... look
at /sys/kernel/debug/tracing/events/kvmmmu/kvm_mmu_unsync_page/format
for instance.
You can fall back to using the attributes to build your own format string.
--
error compiling committee.c: too many arguments to function
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