On Wed 20-03-24 19:02:18, Kemeng Shi wrote:
> Add /sys/kernel/debug/bdi/xxx/wb_stats to show per group writeback stats
> of bdi.
>
> Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
...
> +unsigned long wb_calc_cg_thresh(struct bdi_writeback *wb)
> +{
> + struct dirty_throttle_control gdtc = { GDTC_INIT_NO_WB };
> + struct dirty_throttle_control mdtc = { MDTC_INIT(wb, &gdtc) };
> + unsigned long filepages, headroom, writeback;
> +
> + gdtc.avail = global_dirtyable_memory();
> + gdtc.dirty = global_node_page_state(NR_FILE_DIRTY) +
> + global_node_page_state(NR_WRITEBACK);
> +
> + mem_cgroup_wb_stats(wb, &filepages, &headroom,
> + &mdtc.dirty, &writeback);
> + mdtc.dirty += writeback;
> + mdtc_calc_avail(&mdtc, filepages, headroom);
> + domain_dirty_limits(&mdtc);
> +
> + return __wb_calc_thresh(&mdtc, mdtc.thresh);
> +}
I kind of wish we didn't replicate this logic from balance_dirty_pages()
and wb_over_bg_thresh() into yet another place. But the refactoring would
be kind of difficult. So OK.
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
