Redis is an example of this. When redis saves in the background, it will for and use COW to shapshot a point in time, while the main redis thread keeps going wi

Redis is an example of this. When redis saves in the background, it will for and use COW to shapshot a point in time, while the main redis thread keeps going with the normal redis. If you disable overcommit, redis can fail to fork, when there is actually sufficient memory to save the db.