Messages in this thread | | | Date | Tue, 30 Jun 2015 17:03:24 +0200 | From | Jan Kara <> | Subject | Re: [PATCH 29/51] writeback, blkcg: propagate non-root blkcg congestion state |
| |
On Fri 22-05-15 17:13:43, Tejun Heo wrote: > Now that bdi layer can handle per-blkcg bdi_writeback_congested state, > blk_{set|clear}_congested() can propagate non-root blkcg congestion > state to them. > > This can be easily achieved by disabling the root_rl tests in > blk_{set|clear}_congested(). Note that we still need those tests when > !CONFIG_CGROUP_WRITEBACK as otherwise we'll end up flipping root blkcg > wb's congestion state for events happening on other blkcgs. > > v2: Updated for bdi_writeback_congested.
Looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.com>
Honza
> > Signed-off-by: Tejun Heo <tj@kernel.org> > Cc: Jens Axboe <axboe@kernel.dk> > Cc: Jan Kara <jack@suse.cz> > Cc: Vivek Goyal <vgoyal@redhat.com> > --- > block/blk-core.c | 15 +++++++++------ > 1 file changed, 9 insertions(+), 6 deletions(-) > > diff --git a/block/blk-core.c b/block/blk-core.c > index b457c4f..cf6974e 100644 > --- a/block/blk-core.c > +++ b/block/blk-core.c > @@ -65,23 +65,26 @@ static struct workqueue_struct *kblockd_workqueue; > > static void blk_clear_congested(struct request_list *rl, int sync) > { > - if (rl != &rl->q->root_rl) > - return; > #ifdef CONFIG_CGROUP_WRITEBACK > clear_wb_congested(rl->blkg->wb_congested, sync); > #else > - clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync); > + /* > + * If !CGROUP_WRITEBACK, all blkg's map to bdi->wb and we shouldn't > + * flip its congestion state for events on other blkcgs. > + */ > + if (rl == &rl->q->root_rl) > + clear_wb_congested(rl->q->backing_dev_info.wb.congested, sync); > #endif > } > > static void blk_set_congested(struct request_list *rl, int sync) > { > - if (rl != &rl->q->root_rl) > - return; > #ifdef CONFIG_CGROUP_WRITEBACK > set_wb_congested(rl->blkg->wb_congested, sync); > #else > - set_wb_congested(rl->q->backing_dev_info.wb.congested, sync); > + /* see blk_clear_congested() */ > + if (rl == &rl->q->root_rl) > + set_wb_congested(rl->q->backing_dev_info.wb.congested, sync); > #endif > } > > -- > 2.4.0 > -- Jan Kara <jack@suse.cz> SUSE Labs, CR
| |