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    SubjectRe: [GIT PULL] adaptive spinning mutexes

    * Kay Sievers <kay.sievers@vrfy.org> wrote:

    > On Wed, Jan 14, 2009 at 22:41, Ingo Molnar <mingo@elte.hu> wrote:
    > >
    > > * Ingo Molnar <mingo@elte.hu> wrote:
    > >
    > >> > You just disproved your own case :(
    > >>
    > >> how so? 80% is not enough? I also checked Fedora and it has
    > >> SCHED_DEBUG=y in its kernel rpms.
    > >
    > > Ubuntu has CONFIG_SCHED_DEBUG=y as well in their kernels.
    >
    > $ cat /etc/SuSE-release
    > openSUSE 11.1 (x86_64)
    > VERSION = 11.1
    >
    > $ uname -a
    > Linux nga 2.6.27.7-9-default #1 SMP 2008-12-04 18:10:04 +0100 x86_64
    > x86_64 x86_64 GNU/Linux
    >
    > $ zgrep SCHED_DEBUG /proc/config.gz
    > CONFIG_SCHED_DEBUG=y
    >
    > $ zgrep DEBUG_MUTEX /proc/config.gz
    > # CONFIG_DEBUG_MUTEXES is not set

    Fedora has mutex debugging disabled too:

    # CONFIG_DEBUG_MUTEXES is not set

    So the 3 main Linux distros, generating ~95% of the kerneloops.org
    feedback traffic, all have SCHED_DEBUG=y, and at least two have
    !DEBUG_MUTEXES. (possibly Ubuntu has that disabled it too)

    Ingo


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