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authorTejun Heo <tj@kernel.org>2015-05-23 01:23:21 +0300
committerJens Axboe <axboe@fb.com>2015-06-02 17:38:12 +0300
commit380c27ca33ebecc9da35aa90c8b3a9154f90aac2 (patch)
tree9216a1f6382db31f61bc7ccf3983d0b83553dbe8 /fs/fs-writeback.c
parent8a73179956e649df0d4b3250db17734f272d8266 (diff)
downloadlinux-380c27ca33ebecc9da35aa90c8b3a9154f90aac2.tar.xz
writeback: implement wb_domain
Dirtyable memory is distributed to a wb (bdi_writeback) according to the relative bandwidth the wb is writing out in the whole system. This distribution is global - each wb is measured against all other wb's and gets the proportinately sized portion of the memory in the whole system. For cgroup writeback, the amount of dirtyable memory is scoped by memcg and thus each wb would need to be measured and controlled in its memcg. IOW, a wb will belong to two writeback domains - the global and memcg domains. Currently, what constitutes the global writeback domain are scattered across a number of global states. This patch starts collecting them into struct wb_domain. * fprop_global which serves as the basis for proportional bandwidth measurement and its period timer are moved into struct wb_domain. * global_wb_domain hosts the states for the global domain. * While at it, flatten wb_writeout_fraction() into its callers. This thin wrapper doesn't provide any actual benefits while getting in the way. This is pure reorganization and doesn't introduce any behavioral changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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