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    Subject[049/105] perf: Rebase max unprivileged mlock threshold on top of page size
    2.6.38-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Frederic Weisbecker <fweisbec@gmail.com>

    commit 20443384fe090c5f8aeb016e7e85659c5bbdd69f upstream.

    Ensure we allow 512 kiB + 1 page for user control without
    assuming a 4096 bytes page size.

    Reported-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Stephane Eranian <eranian@google.com>
    LKML-Reference: <1301535209-9679-1-git-send-email-fweisbec@gmail.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    kernel/perf_event.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/kernel/perf_event.c
    +++ b/kernel/perf_event.c
    @@ -62,8 +62,8 @@ static struct srcu_struct pmus_srcu;
    */
    int sysctl_perf_event_paranoid __read_mostly = 1;

    -/* Minimum for 128 pages + 1 for the user control page */
    -int sysctl_perf_event_mlock __read_mostly = 516; /* 'free' kb per user */
    +/* Minimum for 512 kiB + 1 user control page */
    +int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */

    /*
    * max perf event sample rate



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