Date: Thu, 21 Jan 1999 01:33:09 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/vm default_pager.c swap_pager.c Message-ID: <199901210933.BAA21202@freefall.freebsd.org>
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dillon 1999/01/21 01:33:09 PST
Modified files:
sys/vm default_pager.c swap_pager.c
Log:
The default_pager's interaction with the swap_pager has been reorganized,
and the swap_pager has been completely replaced.
The new swap pager uses the new blist radix-tree based bitmap allocator
for low level swap allocation and deallocation. The new allocator
is effectively O(5) while the old one was O(N), and the new allocator
allocates all required memory at init time rather then at allocate
memory on the fly at run time.
Swap metadata is allocated in clusters and stored in a hash table,
eliminating linearly allocated structures.
Many, many features have been rewritten or added. Swap space is now
reallocated on the fly providing a poor-mans auto defragmentation of
swap space. Swap space that is no longer needed is freed on a timely
basis so no garbage collection is necessary.
Swap I/O is marked B_ASYNC and NFS has been fixed to do the right
thing with it, so NFS-based paging now has around 10x the performance
as it did before ( previously NFS enforced synchronous I/O for paging ).
Revision Changes Path
1.18 +1 -1 src/sys/vm/default_pager.c
1.109 +1 -1 src/sys/vm/swap_pager.c
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