UVM: pid 2158.1 (Xorg), uid 0 killed: out of swap

[Timo Buhrmester <fstd.lkml%gmail.com@localhost>]

7.99.67/i386 will occasinally believe to run out of swap, even if
there's like 2 gig free swap around, and over 1.5 gig used for file
buffers.

Is anybody else seeing this problem?  It does happen when several
moderately resource-intensive processes are running (web browser,
video player, bitcoin client (not mining), but it doesn't ever look
like the system is actually out of swap.  And, worst of all, it's
always Xorg who gets the stick.

Does anyone have an idea what to do about it?