A memory region can be relatively large. Searching for a value in the
entire region is time-consuming, especially when running tests against
a remote target, because the memory data is transferred in small chunks
over a relatively slow GDB Remote Protocol. The patch limits the address
range to be searched to 2K, which seems sufficient for these tests. In
my setup, for local runs, these tests now take half the time they did
before the patch. For a remote target, the improvement is even more
significant.