on 3/26/2024 8:24 PM, Jan Kara wrote:
> 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.
Thanks for review the code.
I have considered about this. It's difficult and will introduce a lot
change to non-debug code which make this series uneasy to review.
I will submit another patch for refactoring if I could find a way to
clean the code.
Kemeng
>
> Honza
>
