Hello,
Changes from the last take[L] are
* Rebased on top of block/for-4.2/core.
While the previous patchset[1] implemented cgroup writeback support,
the IO back pressure propagation mechanism implemented in
balance_dirty_pages() and its subroutines isn't yet aware of cgroup
writeback.
Processes belonging to a memcg may have access to only subset of total
memory available in the system and not factoring this into dirty
throttling rendered it completely ineffective for processes under
memcg limits and memcg ended up building a separate ad-hoc degenerate
mechanism directly into vmscan code to limit page dirtying.
This patchset refactors the dirty throttling logic implemented in
balance_dirty_pages() and its subroutines os that it can handle both
global and memcg memory domains. Dirty throttling mechanism is
applied against both the global and memcg constraints and the more
restricted of the two is used for actual throttling.
This makes the dirty throttling mechanism operational for memcg
domains including writeback-bandwidth-proportional dirty page
distribution inside them.
This patchset contains the following 19 patches.
0001-memcg-make-mem_cgroup_read_-stat-event-iterate-possi.patch
0002-writeback-clean-up-wb_dirty_limit.patch
0003-writeback-reorganize-__-wb_update_bandwidth.patch
0004-writeback-implement-wb_domain.patch
0005-writeback-move-global_dirty_limit-into-wb_domain.patch
0006-writeback-consolidate-dirty-throttle-parameters-into.patch
0007-writeback-add-dirty_throttle_control-wb_bg_thresh.patch
0008-writeback-make-__wb_calc_thresh-take-dirty_throttle_.patch
0009-writeback-add-dirty_throttle_control-pos_ratio.patch
0010-writeback-add-dirty_throttle_control-wb_completions.patch
0011-writeback-add-dirty_throttle_control-dom.patch
0012-writeback-make-__wb_writeout_inc-and-hard_dirty_limi.patch
0013-writeback-separate-out-domain_dirty_limits.patch
0014-writeback-move-over_bground_thresh-to-mm-page-writeb.patch
0015-writeback-update-wb_over_bg_thresh-to-use-wb_domain-.patch
0016-writeback-implement-memcg-wb_domain.patch
0017-writeback-reset-wb_domain-dirty_limit-_tstmp-when-me.patch
0018-writeback-implement-memcg-writeback-domain-based-thr.patch
0019-mm-vmscan-disable-memcg-direct-reclaim-stalling-if-c.patch
0001-0003 are prep patches.
0004-0015 refactors dirty throttling logic so that it operates on
wb_domain.
0016-0019 implement memcg wb_domain.
This patchset is on top of
block/for-4.2/core b04a5636a665 ("block: replace trylock with mutex_lock in blkdev_reread_part()")
+ [1] [PATCHSET 1/3 v4 block/for-4.2/core] writeback: cgroup writeback support
and available in the following git branch.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-writeback-backpressure-20150522
diffstat follows. Thanks.
fs/fs-writeback.c | 32 -
include/linux/backing-dev-defs.h | 1
include/linux/memcontrol.h | 21 +
include/linux/writeback.h | 84 +++-
include/trace/events/writeback.h | 7
mm/backing-dev.c | 15
mm/memcontrol.c | 145 +++++--
mm/page-writeback.c | 744 +++++++++++++++++++++++++--------------
mm/vmscan.c | 51 ++
9 files changed, 739 insertions(+), 361 deletions(-)
--
tejun
[L] http://lkml.kernel.org/g/1428350674-8303-1-git-send-email-tj@xxxxxxxxxx
[1] http://lkml.kernel.org/g/1432329245-5844-1-git-send-email-tj@xxxxxxxxxx
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