linux-kernel - Re: [PATCH v14 07/20] mm/thp: narrow lru locking

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Message-ID: <d4d8bbba-12af-45c2-a35d-58f962ca5f9a@linux.alibaba.com>
Date:   Fri, 10 Jul 2020 22:09:42 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        tj@...nel.org, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, yang.shi@...ux.alibaba.com,
        lkp@...el.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, shakeelb@...gle.com,
        iamjoonsoo.kim@....com, richard.weiyang@...il.com
Subject: Re: [PATCH v14 07/20] mm/thp: narrow lru locking



在 2020/7/10 下午7:28, Kirill A. Shutemov 写道:
>>   *           hugetlb_fault_mutex (hugetlbfs specific page fault mutex)
>>   *           anon_vma->rwsem
>>   *             mm->page_table_lock or pte_lock
>> - *               pgdat->lru_lock (in mark_page_accessed, isolate_lru_page)
>>   *               swap_lock (in swap_duplicate, swap_info_get)
>>   *                 mmlist_lock (in mmput, drain_mmlist and others)
>>   *                 mapping->private_lock (in __set_page_dirty_buffers)
>> - *                   mem_cgroup_{begin,end}_page_stat (memcg->move_lock)
>> + *                   lock_page_memcg move_lock (in __set_page_dirty_buffers)
>>   *                     i_pages lock (widely used)
>> + *                       lock_page_lruvec_irq lruvec->lru_lock
> I think it has to be
> 			    lruvec->lru_lock (in lock_page_lruvec_irq)

Good catch! I will update it in next version.
Thanks!

> 
> No?

> 
>>   *                 inode->i_lock (in set_page_dirty's __mark_inode_dirty)
>>   *                 bdi.wb->list_lock (in set_page_dirty's __mark_inode_dirty)
>>   *                   sb_lock (within inode_lock in fs/fs-writeback.c)
>>
>>> local_irq_disable() also deserves a comment.
>>>
>> yes, I will add a comment for this. Do you mind give reviewed-by for this patch?
> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Thanks a lot! :)