]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
percpu_counter: new function percpu_counter_sum_and_set
authorMingming Cao <cmm@us.ibm.com>
Fri, 11 Jul 2008 23:27:31 +0000 (19:27 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Fri, 11 Jul 2008 23:27:31 +0000 (19:27 -0400)
commite8ced39d5e8911c662d4d69a342b9d053eaaac4e
treecd4d643bfbd37c67ff9bd2feff2c0b477a56f117
parent64769240bd07f446f83660bb143bb609d8ab4910
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>
fs/ext4/balloc.c
include/linux/percpu_counter.h
lib/percpu_counter.c