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From: Matthew Wilcox <willy@infradead.org>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	SeongJae Park <sj@kernel.org>,
	damon@lists.linux.dev, linux-mm@kvack.org,
	vishal.moola@gmail.com, david@redhat.com
Subject: Re: [PATCH -next v2 1/7] mm: page_idle: Convert page idle to use folios
Date: Tue, 27 Dec 2022 18:14:52 +0000	[thread overview]
Message-ID: <Y6s2HPjrON2Sx/gr@casper.infradead.org> (raw)
In-Reply-To: <20221227122714.161224-2-wangkefeng.wang@huawei.com>

On Tue, Dec 27, 2022 at 08:27:08PM +0800, Kefeng Wang wrote:
> -static struct page *page_idle_get_page(unsigned long pfn)
> +static struct folio *page_idle_get_folio(unsigned long pfn)
>  {
>  	struct page *page = pfn_to_online_page(pfn);
> +	struct folio *folio;
>  
> -	if (!page || !PageLRU(page) ||
> -	    !get_page_unless_zero(page))
> +	if (!page || !PageLRU(page) || !get_page_unless_zero(page))
>  		return NULL;

Mmmm, no.  PageLRU hides a compound_head() call.  Try doing this instead:

	if (!page || PageTail(page))
		return NULL;
	folio = page_folio(page);
	if (!folio_test_lru(folio) || !folio_try_get(folio))
		return NULL;
	if (page_folio(page) != folio || !folio_test_lru(folio)) {
		folio_put(folio);
		folio = NULL;
	}

	return NULL;


  reply	other threads:[~2022-12-27 18:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-27 12:27 [PATCH -next v2 0/7] mm: convert page_idle/damon to use folios Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 1/7] mm: page_idle: Convert page idle " Kefeng Wang
2022-12-27 18:14   ` Matthew Wilcox [this message]
2022-12-28  1:18     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 2/7] mm: damon: introduce damon_get_folio() Kefeng Wang
2022-12-27 19:42   ` SeongJae Park
2022-12-27 19:49     ` Matthew Wilcox
2022-12-27 21:38       ` SeongJae Park
2022-12-28  2:06     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 3/7] mm: damon: convert damon_ptep/pmdp_mkold() to use folios Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 4/7] mm: damon: paddr: convert damon_pa_*() " Kefeng Wang
2022-12-27 19:50   ` SeongJae Park
2022-12-28  1:26     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 5/7] mm: damon: vaddr: convert damon_young_pmd_entry() to use folio Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 6/7] mm: damon: remove unneed damon_get_page() Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 7/7] mm: damon: vaddr: convert hugetlb related function to use folios Kefeng Wang

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