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Date: Wed, 01 Sep 2010 11:42:13 +0300 From: Avi Kivity <avi@...hat.com> To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>, Frederic Weisbecker <fweisbec@...il.com>, Steven Rostedt <rostedt@...dmis.org> CC: kvm-devel <kvm@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: ftrace/perf_event leak I recently added perf_event support to kvm_stat, to display kvm tracepoints as statistics (I'd like to fold this to tools/perf eventually, but that's another story). However I'm seeing a resource leak - after I quit the tool, there are quite a few references into the kvm module: kvm_intel 43655 0 kvm 272984 269 kvm_intel The tool is just a python script that reads /sys/kernel/debug/tracing/events/kvm to find out which events are available, uses perf_event_open() to create one group per cpu to which a lot of events are attached. The only special thing I can think of is that we use an ioctl to attach a filter to many perf_event descriptors. You can find the source at http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=blob_plain;f=kvm/kvm_stat;hb=5bd5f131b50cb373ff4e2a3632c6dad00a1f0b55. All it needs are the kvm modules loaded; no need to actually run a guest. Run as root. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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