The thrashing I reported is caused by a leak in generic_file_write()
when using KNFS on a local mount. Doing a series of 1M iozones and
checking with memleak shows..
filemap.c:1573: 256 256 256 256 256 256 256 256 256 DELTA: 2048
that none of the memory is being freed after an NFS write completes.
I placed a diagnostic printk in fs/nfs/write.c and found that page->count
is always 3 at the time that nfs_wback_result() tries to __free_page().
nfs_wback_result: freeing.. page->count is 3
-Mike
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