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    Subject[PATCH V5 03/13] perf: Allow pmu to choose cpu on which to install event
    Date
    From: "Yan, Zheng" <zheng.z.yan@intel.com>

    Allow the pmu->event_init callback to change event->cpu, so pmu can
    choose cpu on which to install event.

    Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
    ---
    kernel/events/core.c | 8 ++++----
    1 file changed, 4 insertions(+), 4 deletions(-)

    diff --git a/kernel/events/core.c b/kernel/events/core.c
    index d71a2d6..2c05027 100644
    --- a/kernel/events/core.c
    +++ b/kernel/events/core.c
    @@ -6302,7 +6302,7 @@ SYSCALL_DEFINE5(perf_event_open,
    /*
    * Get the target context (task or percpu):
    */
    - ctx = find_get_context(pmu, task, cpu);
    + ctx = find_get_context(pmu, task, event->cpu);
    if (IS_ERR(ctx)) {
    err = PTR_ERR(ctx);
    goto err_alloc;
    @@ -6375,16 +6375,16 @@ SYSCALL_DEFINE5(perf_event_open,
    mutex_lock(&ctx->mutex);

    if (move_group) {
    - perf_install_in_context(ctx, group_leader, cpu);
    + perf_install_in_context(ctx, group_leader, event->cpu);
    get_ctx(ctx);
    list_for_each_entry(sibling, &group_leader->sibling_list,
    group_entry) {
    - perf_install_in_context(ctx, sibling, cpu);
    + perf_install_in_context(ctx, sibling, event->cpu);
    get_ctx(ctx);
    }
    }

    - perf_install_in_context(ctx, event, cpu);
    + perf_install_in_context(ctx, event, event->cpu);
    ++ctx->generation;
    perf_unpin_context(ctx);
    mutex_unlock(&ctx->mutex);
    --
    1.7.10.2


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