K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2017-11-28T17:46:03.745026Z
K 7
svn:log
V 579
When the swap pager allocates space on disk, it requests contiguous
blocks in a single call to blist_alloc().  However, when it frees
that space, it previously called blist_free() on each block, one at a
time.  With this change, the swap pager identifies ranges of
contiguous blocks to be freed, and calls blist_free() once per
range.  In one extreme case, that is described in the review, the time
to perform an munmap(2) was reduced by 55%.

Submitted by:	Doug Moore <dougm@rice.edu>
Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D12397

END