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Andrey Sidorov authored
Improve mb_free_blocks speed by clearing entire range at once instead of iterating over each bit. Freeing block-by-block also makes buddy bitmap subtree flip twice making most of the work a no-op. Very few bits in buddy bitmap require change, e.g. freeing entire group is a 1 bit flip only. As a result, releasing blocks of 60G file now takes 5ms instead of 2.7s. This is especially good for non-preemptive kernels as there is no rescheduling during release. Signed-off-by:
Andrey Sidorov <qrxd43@motorola.com> Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu>
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