Partial page discard requests are ignored and the documentation on why this is correct behaviour sucks. A readahead patch looked like a "regression" to a random IO storage benchmark because posix_fadvise() was used incorrectly to force IO requests to go to disk. In reality, the benchmark sucked but it was non-obvious why. Patch 1 updates the kernel comment in case someone "fixes" either readahead or fadvise for inappropriate reasons. Patch 2 updates the relevant man page on the rough off chance that application developers do not read kernel source comments.
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