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When working on large diffs (eg in meta-oe's repro test) diffoscope may use a huge amount of memory and trigger OOM kills on parallel builds. Use the max_diff_block_lines_saved option to limit to 1024 the number of diff lines saved in a block. Also, limit the number of line in the report to generate a report even when the limit is reached. The chosen default 1024 comes from diffoscope default for a diff block. For a random 10MB binary (packaged in ipk, deb and rpm), this does decrease the "Maximum resident set size" of diffoscope from 1.3GB to 400MB. As an added bonus, this also make diffoscope bail out earlier, on the same example: execution time goes from 30 minutes down to 7. Fixes [YOCTO #15876] (From OE-Core rev: 04cbcfc7e09d19b0ba50e7940fc82d10e222fdbe) Signed-off-by: Yoann Congal <yoann.congal@smile.fr> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>