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    SubjectRe: [PATCH 1/3] perf, tool: Force guest machine definition option
    On 4/13/12 6:41 AM, Jiri Olsa wrote:
    > I get same error even on acme's urgent branch.. do you mean
    > below one? It fixes the guest machine lookup for mmap event.
    >
    > perf kvm: Finding struct machine fails for PERF_RECORD_MMAP
    > commit 7fb0a5ee8889488f7568ffddffeb66ddeb50917e
    > Author: Nikunj A. Dadhania<nikunj@linux.vnet.ibm.com>
    > Date: Mon Apr 9 13:52:23 2012 +0530

    That's the one I was referring to.

    >
    > In my case it looks like for some reason the guest buildid DSO
    > is not stored in record phase (no hits maybe?), so report won't
    > create guest machine record at all and get NULL machine.

    I see now -- different problem, but similar in that it's an mmap event
    and the pid is 0.

    I need to take my daughter to school and won't get back to this for a
    while but what I am seeing is that on perf-record mmap events are
    generated with pid set to DEFAULT_GUEST_KERNEL_ID = 0
    (machines__create_guest_kernel_maps).

    On the report side a machine has not been created for pid of 0, so the
    look up in perf_session__find_machine_for_cpumode fails.

    David


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