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authorMingming Cao <cmm@us.ibm.com>2008-07-11 19:27:31 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-07-11 19:27:31 -0400
commite8ced39d5e8911c662d4d69a342b9d053eaaac4e (patch)
treecd4d643bfbd37c67ff9bd2feff2c0b477a56f117 /fs/ext4/super.c
parent64769240bd07f446f83660bb143bb609d8ab4910 (diff)
percpu_counter: new function percpu_counter_sum_and_set
Delayed allocation need to check free blocks at every write time. percpu_counter_read_positive() is not quit accurate. delayed allocation need a more accurate accounting, but using percpu_counter_sum_positive() is frequently is quite expensive. This patch added a new function to update center counter when sum per-cpu counter, to increase the accurate rate for next percpu_counter_read() and require less calling expensive percpu_counter_sum(). Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/super.c')
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