From: Mingming Cao Date: Fri, 11 Jul 2008 23:27:31 +0000 (-0400) Subject: percpu_counter: new function percpu_counter_sum_and_set X-Git-Tag: v2.6.27-rc1~1087^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8ced39d5e8911c662d4d69a342b9d053eaaac4e;p=pandora-kernel.git 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 Signed-off-by: "Theodore Ts'o" --- Reading git-diff-tree failed