xz: Add comments.

diff --git a/src/xz/coder.c b/src/xz/coder.c
index a4081731e8f9b4b30e8f20853254a619064b99af..d694c8e0d8050a67a47a5d877b9c58a388871a0e 100644 (file)
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -581,6 +581,13 @@ coder_set_compression_settings(void)
 
                        if (memory_usage <= memory_limit) {
                                // The memory usage is now low enough.
+                               //
+                               // Since 5.6.1: This is only shown at
+                               // V_DEBUG instead of V_WARNING because
+                               // changing the number of threads doesn't
+                               // affect the output. On some systems this
+                               // message would be too common now that
+                               // multithreaded compression is the default.
                                message(V_DEBUG, _("Reduced the number of "
                                        "threads from %s to %s to not exceed "
                                        "the memory usage limit of %s MiB"),
@@ -600,6 +607,9 @@ coder_set_compression_settings(void)
                // way -T0 won't use insane amount of memory but at the same
                // time the soft limit will never make xz fail and never make
                // xz change settings that would affect the compressed output.
+               //
+               // Since 5.6.1: Like above, this is now shown at V_DEBUG
+               // instead of V_WARNING.
                if (hardware_memlimit_mtenc_is_default()) {
                        message(V_DEBUG, _("Reduced the number of threads "
                                "from %s to one. The automatic memory usage "