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Use the interval tree to find empty space, rather than probing each page in turn. Cc: Warner Losh <imp@bsdimp.com> Cc: Kyle Evans <kevans@freebsd.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-bt: Warner Losh <imp@bsdimp.com> Message-Id: <20230707204054.8792-18-richard.henderson@linaro.org>