On Thu, 10 Aug 2006 11:50:47 +0400
Evgeniy Polyakov [off-list ref] wrote:

quoted

Afaict this mmap function gives a user a free way of getting pinned memory. 
What is the upper bound on the amount of memory which a user can thus
obtain?

it is limited by maximum queue length which is 4k entries right now, so
maximum number of paged here is 4k*40/page_size, i.e. about 40 pages on
x86.

Is that per user or per fd?  If the latter that is, with the usual
RLIMIT_NOFILE, 160MBytes.  2GB with 64k pagesize.  Problem ;)