Re: [PATCH -next v3 2/2] mm: vmscan: add new event to trace shrink lru

Re: [PATCH -next v3 2/2] mm: vmscan: add new event to trace shrink lru

[Yu Zhao]

On Wed, Dec 13, 2023 at 6:35 PM Bixuan Cui <cuibixuan@vivo.com> wrote:
>
> From: cuibixuan <cuibixuan@vivo.com>
>
> Add a new event to calculate the shrink_inactive_list()/shrink_active_list()
> execution time.
>
> Example of output:
>          kswapd0-103     [007] .....  1098.353020: mm_vmscan_lru_shrink_active_start: nid=0
>          kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_active_end: nid=0 nr_taken=32 nr_active=0 nr_deactivated=32 nr_referenced=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>          kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_inactive_start: nid=0
>          kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 nr_reclaimed=0 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=32 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
>          kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_start: nid=0
>          kswapd0-103     [007] .....  1098.353162: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 nr_reclaimed=21 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=11 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>
> Signed-off-by: Bixuan Cui <cuibixuan@vivo.com>

NAK.

A _start should always be paired with an _end unless there is a good
reason not to.

mm-commits@ is the wrong mailing list to submit MM patches.

Is the build error Andrew pointed out earlier fixed? If so, where is
it credited to him?

Re: [PATCH -next v3 2/2] mm: vmscan: add new event to trace shrink lru

[Bixuan Cui]

在 2023/12/14 11:59, Yu Zhao 写道:
>> Example of output:
>>           kswapd0-103     [007] .....  1098.353020: mm_vmscan_lru_shrink_active_start: nid=0
>>           kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_active_end: nid=0 nr_taken=32 nr_active=0 nr_deactivated=32 nr_referenced=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>>           kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_inactive_start: nid=0
>>           kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 nr_reclaimed=0 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=32 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
>>           kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_start: nid=0
>>           kswapd0-103     [007] .....  1098.353162: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 nr_reclaimed=21 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=11 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>>
>> Signed-off-by: Bixuan Cui<cuibixuan@vivo.com>
> NAK.
> 
> A _start should always be paired with an _end unless there is a good
> reason not to.
Yes, I want to get the duration of shrink lru and slab (including 
shrink_active_list()/shrink_inactive_list()/shrinker->count_objects()/shrinker->scan_objects()),and 
then calculate the memory recycling rate.

> 
> mm-commits@ is the wrong mailing list to submit MM patches.
Thanks for reminding.

> 
> Is the build error Andrew pointed out earlier fixed? If so, where is
> it credited to him?
Build error has been fixed in v2 patch, changes log:
v3: Swap the positions of 'nid' and 'freeable' to prevent the hole in 
the trace event.
v2: Modify trace_mm_vmscan_lru_shrink_inactive() in evict_folios() at 
the same time.

Thanks
Bixuan Cui