tree da40561f3d87ee1073e92ca925ed3ed36708a1d7
parent 2395e463fefd4aa8b784787e926e9b84e216d14f
author Jens Axboe <jens.axboe@oracle.com> 1274093463 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1274093463 +0200

writeback: disable periodic old data writeback for !dirty_writeback_centisecs

Prior to 2.6.32, setting /proc/sys/vm/dirty_writeback_centisecs disabled
periodic dirty writeback from kupdate. This got broken and now causes
excessive sys CPU usage if set to zero, as we'll keep beating on
schedule().

Cc: stable@kernel.org
Reported-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>