WordPress at a glance
filter is not described

wpsc_only_cache_known_pages filter-hook . WPSCache 1.0

Usage

add_filter( 'wpsc_only_cache_known_pages', 'filter_function_name_4671' );
function filter_function_name_4671( $1 ){
	// filter...

	return $1;
}
$1
-

Where the hook is called

wp_cache_ob_callback()
wpsc_only_cache_known_pages
wp-super-cache/wp-cache-phase2.php 1865
} elseif ( empty( $wp_super_cache_query ) && !empty( $buffer ) && apply_filters( 'wpsc_only_cache_known_pages', 1 ) ) {

Where in WP core the hook is used WP Super Cache

Usage not found.