re:Does anyone of us know when the long rolls of carpeting came onto the market?

well both carpets and rugs are woven (well the flooring kind of carpets and rugs are!)

looms have always come in different sizes. large carpets (persian/oriental) were rare --because 1 large looms are rare, and 2they took longer to weave, (so fewer could be woven in a life time) and 3while much of persia (iran) is, and has been for centuries, settled (ie not nomadic)-many 'oriental' type carpets were made by nomadic or semi nomadic people. big looms can't readily be dis assembling and re assembling--while being used. so large carpets could only be constructed in large rooms, in towns/cities.
small carpets might only have one 'weaver' large ones were often designed and overseen by 1 person, but several children (often girls) were put to work making the carpet.. these girls were semi skilled.

machine looms (and france and belgium had some of the biggest pre industrial revolution looms) had the same limitations.
--there are all sorts of tensioning problems with big looms, and looms take a huge amount of time to 'set up' (about 10 to 12 hours for a simple 3 foot wide 4 heedle loom) -- exponentionaly more for each foot/heedle) --this made large carpets way more expensive than small ones!

power looms allowed for longer, continues strips, and early 'wall to wall' carpet was often made of several strips each 3 to 4 feet (circa 1 m.) wide, sewn together, and secured to the floor.

nowdays, new manufactureing techniques, and power means that some carpets are made 20 feet wide! --but 12 to 15 foot wide strips are more normal.

if you had 'wall to wall' carpeting installed, you know, its is invibible 'pieced' together.