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| /openbmc/linux/fs/ext4/ |
| H A D | mballoc.c | eabe0444 Tue Apr 09 11:22:29 CDT 2013 Andrey Sidorov <qrxd43@motorola.com> ext4: speed-up releasing blocks on commit
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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