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    Subject[patch v7 07/10] task isolation: enable return to userspace processing
    Enable processing of pending task isolation work if per-CPU vmstats
    are out of sync with global vmstats.

    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

    ---
    include/linux/task_isolation.h | 22 +++++++++++++++++++++-
    kernel/task_isolation.c | 13 +++++++++++++
    2 files changed, 34 insertions(+), 1 deletion(-)

    Index: linux-2.6/include/linux/task_isolation.h
    ===================================================================
    --- linux-2.6.orig/include/linux/task_isolation.h
    +++ linux-2.6/include/linux/task_isolation.h
    @@ -5,6 +5,9 @@

    #ifdef CONFIG_CPU_ISOLATION

    +#include <linux/vmstat.h>
    +#include <uapi/linux/prctl.h>
    +
    struct isol_info {
    /* Which features have been configured */
    u64 conf_mask;
    @@ -51,7 +54,24 @@ void isolation_exit_to_user_mode(void);

    static inline int task_isol_has_work(void)
    {
    - return 0;
    + int cpu, ret;
    + struct isol_info *i;
    +
    + if (likely(current->isol_info == NULL))
    + return 0;
    +
    + i = current->isol_info;
    + if (i->active_mask != ISOL_F_QUIESCE)
    + return 0;
    +
    + if (!(i->quiesce_mask & ISOL_F_QUIESCE_VMSTATS))
    + return 0;
    +
    + cpu = get_cpu();
    + ret = per_cpu(vmstat_dirty, cpu);
    + put_cpu();
    +
    + return ret;
    }

    #else
    Index: linux-2.6/kernel/task_isolation.c
    ===================================================================
    --- linux-2.6.orig/kernel/task_isolation.c
    +++ linux-2.6/kernel/task_isolation.c
    @@ -23,6 +23,13 @@

    void __tsk_isol_exit(struct task_struct *tsk)
    {
    + struct isol_info *i;
    +
    + i = tsk->isol_info;
    + if (!i)
    + return;
    +
    + static_key_slow_dec(&vmstat_sync_enabled);
    }

    void __tsk_isol_free(struct task_struct *tsk)
    @@ -41,6 +48,12 @@ static struct isol_info *tsk_isol_alloc_
    if (unlikely(!info))
    return ERR_PTR(-ENOMEM);

    + preempt_disable();
    + init_sync_vmstat();
    + preempt_enable();
    +
    + static_key_slow_inc(&vmstat_sync_enabled);
    +
    return info;
    }


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