How to trigger bulk update action? [closed]

Question

I have more than a hunderd posts from custom post type and I have to add custom fields to each post, I've used 'save_post' to trigger update/publish event, but for me it works only when "Publish" button is pressed on the edit page.

I want to use "Bulk Edit" to update old posts, but 'save_post' hook doesn't work for me.

Here's my code:

function wpse_75167_add_custom_meta( $post_id ) {
    global $ptypes;

    $cptype = get_post_type();

    // Add Custom Meta to Specific Posts Only
    if( !array_key_exists( $cptype, $ptypes ) ) 
        return;

    // Get Parent Venue ID
    $parent_id = get_post_meta( $post_id, $ptypes[$cptype]['meta_key_parent'], true );

    // Get Venue Title
    if( ! $parent_id ) 
        return;

    $post_title = get_the_title( $parent_id );

    // Check If Meta Key Exists
    if( get_post_meta( $post_id, $ptypes[$cptype]['meta_key_sortable'], true ) ) {
        update_post_meta( $post_id, $ptypes[$cptype]['meta_key_sortable'], $post_title );
    } else {
        add_post_meta( $post_id, $ptypes[$cptype]['meta_key_sortable'], $post_title );
    }
}
add_action( 'save_post', 'wpse_75167_add_custom_meta' );