Created attachment 202340 [details]
Typescript showing the effect of "svn cleanup"
I've been tracking FreeBSD via source updates since ~1999 or so -- first, with CVS; more recently, using svn.
I recently discovered that there may be a benefit to running "svn cleanup" even if nothing has gone obviously wrong: During a "make installkernel" for head/amd64 recently, there was an attempt to store more in /usr than would fit.
In a fit of desperation, I tried "svn cleanup" ... and recovered about 3.2 GB (after which, re-starting "make installkernel" was successful).
I have attached a typescript that depicts the situation.