在 2023/9/12 00:08, Johannes Weiner 写道:
> On Sat, Sep 09, 2023 at 11:52:41PM +0800, Xin Hao wrote:
>> At present, we support per-memcg reclaim strategy, however we do not
>> know the number of transparent huge pages being reclaimed, as we know
>> the transparent huge pages need to be splited before reclaim them, and
>> they will bring some performance bottleneck effect. for example, when
>> two memcg (A & B) are doing reclaim for anonymous pages at same time,
>> and 'A' memcg is reclaiming a large number of transparent huge pages, we
>> can better analyze that the performance bottleneck will be caused by 'A'
>> memcg. therefore, in order to better analyze such problems, there add
>> THP swap out info for per-memcg.
>>
>> Signed-off-by: Xin Hao <[email protected]>
> That sounds reasonable. A few comments below:
>
>> @@ -4131,6 +4133,10 @@ static const unsigned int memcg1_events[] = {
>> PGPGOUT,
>> PGFAULT,
>> PGMAJFAULT,
>> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> + THP_SWPOUT,
>> + THP_SWPOUT_FALLBACK,
>> +#endif
>> };
> Cgroup1 is maintenance-only, please drop this hunk.
Will remove it next version thanks.
>
>> static void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
>> diff --git a/mm/page_io.c b/mm/page_io.c
>> index fe4c21af23f2..008ada2e024a 100644
>> --- a/mm/page_io.c
>> +++ b/mm/page_io.c
>> @@ -208,8 +208,10 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
>> static inline void count_swpout_vm_event(struct folio *folio)
>> {
>> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> - if (unlikely(folio_test_pmd_mappable(folio)))
>> + if (unlikely(folio_test_pmd_mappable(folio))) {
>> + count_memcg_events(folio_memcg(folio), THP_SWPOUT, 1);
> count_memcg_folio_events()
Done.
>
>> count_vm_event(THP_SWPOUT);
>> + }
>> #endif
>> count_vm_events(PSWPOUT, folio_nr_pages(folio));
>> }
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index ea57a43ebd6b..29a82b72345a 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -1928,6 +1928,8 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
>> folio_list))
>> goto activate_locked;
>> #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> + count_memcg_events(folio_memcg(folio),
>> + THP_SWPOUT_FALLBACK, 1);
> count_memcg_folio_events()
Done.
thanks.