linux-kernel - Re: [v5][PATCH 5/6] mm: vmscan: batch shrink_page

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Date:	Wed, 05 Jun 2013 07:24:36 -0700
From:	Dave Hansen <dave@...1.net>
To:	Hillf Danton <dhillf@...il.com>
CC:	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mgorman@...e.de, tim.c.chen@...ux.intel.com
Subject: Re: [v5][PATCH 5/6] mm: vmscan: batch shrink_page_list() locking
 operations

On 06/05/2013 12:28 AM, Hillf Danton wrote:
>>>> >> > +       mapping = page_mapping(lru_to_page(remove_list));
>>>> >> > +       spin_lock_irq(&mapping->tree_lock);
>>>> >> > +       while (!list_empty(remove_list)) {
>>>> >> > +               page = lru_to_page(remove_list);
>>>> >> > +               BUG_ON(!PageLocked(page));
>>>> >> > +               BUG_ON(page_mapping(page) != mapping);
>>>> >> > +               list_del(&page->lru);
>>>> >> > +
>>>> >> > +               if (!__remove_mapping(mapping, page)) {
>>>> >> > +                       unlock_page(page);
>>>> >> > +                       list_add(&page->lru, ret_pages);
>>>> >> > +                       continue;
>>>> >> > +               }
>>>> >> > +               list_add(&page->lru, &need_free_mapping);
>>>> >> > +       }
>>>> >> > +       spin_unlock_irq(&mapping->tree_lock);
>>>> >> > +
>>> >> While reclaiming pages, can we open ears upon IRQ controller,
>>> >> if the page list length is over 10, or even 20?
>> >
>> > At the moment, it implicitly could be bounded by SWAP_CLUSTER_MAX and
> Could we reclaim a THP currently?

No, it would be split first.

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