From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 02/19] mm: Use multi-index entries in the page cache
Date: Tue, 3 Nov 2020 17:04:21 +0300 [thread overview]
Message-ID: <20201103140421.alhfhxwlye5ygwkn@box> (raw)
In-Reply-To: <20201029193405.29125-3-willy@infradead.org>
On Thu, Oct 29, 2020 at 07:33:48PM +0000, Matthew Wilcox (Oracle) wrote:
> +static inline bool thp_last_tail(struct page *head, pgoff_t index)
> +{
> + if (!PageTransCompound(head) || PageHuge(head))
> + return true;
Do we need the branch? It's going to be reduced to index == head->index
for non-THP anyway. It should be fine, right?
> + return index == head->index + thp_nr_pages(head) - 1;
> +}
> +
It's true for non-THP, so name is somewhat misleading.
Maybe is_last_subpage() or something?
--
Kirill A. Shutemov
next prev parent reply other threads:[~2020-11-03 14:04 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-29 19:33 [PATCH 00/19] Transparent Hugepages for non-tmpfs filesystems Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 01/19] XArray: Expose xas_destroy Matthew Wilcox (Oracle)
2020-10-29 20:33 ` Zi Yan
2020-10-29 19:33 ` [PATCH 02/19] mm: Use multi-index entries in the page cache Matthew Wilcox (Oracle)
2020-10-29 20:49 ` Zi Yan
2020-10-29 21:54 ` Matthew Wilcox
2020-10-30 14:48 ` Zi Yan
2020-11-03 14:04 ` Kirill A. Shutemov [this message]
2020-10-29 19:33 ` [PATCH 03/19] mm: Support arbitrary THP sizes Matthew Wilcox (Oracle)
2020-10-29 20:50 ` Zi Yan
2020-10-29 19:33 ` [PATCH 04/19] mm: Change NR_FILE_THPS to account in base pages Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 05/19] mm/filemap: Rename generic_file_buffered_read subfunctions Matthew Wilcox (Oracle)
2020-10-30 0:04 ` Kent Overstreet
2020-10-30 8:56 ` Christoph Hellwig
2020-11-03 14:16 ` Kirill A. Shutemov
2020-11-03 14:40 ` Matthew Wilcox
2020-11-03 15:02 ` Kirill A. Shutemov
2020-10-29 19:33 ` [PATCH 06/19] mm/filemap: Change calling convention for gfbr_ functions Matthew Wilcox (Oracle)
2020-10-30 0:05 ` Kent Overstreet
2020-10-29 19:33 ` [PATCH 07/19] mm/filemap: Use head pages in generic_file_buffered_read Matthew Wilcox (Oracle)
2020-10-30 0:19 ` Kent Overstreet
2020-10-30 1:03 ` Matthew Wilcox
2020-10-29 19:33 ` [PATCH 08/19] mm/filemap: Add __page_cache_alloc_order Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 09/19] mm/filemap: Allow THPs to be added to the page cache Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 10/19] mm/vmscan: Optimise shrink_page_list for smaller THPs Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 11/19] mm/filemap: Allow PageReadahead to be set on head pages Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 12/19] mm: Pass a sleep state to put_and_wait_on_page_locked Matthew Wilcox (Oracle)
2020-10-29 19:33 ` [PATCH 13/19] mm/filemap: Support readpage splitting a page Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 14/19] mm/filemap: Inline __wait_on_page_locked_async into caller Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 15/19] mm/readahead: Add THP readahead Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 16/19] mm/readahead: Align THP mappings for non-DAX Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 17/19] mm/readahead: Switch to page_cache_ra_order Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 18/19] mm/filemap: Support VM_HUGEPAGE for file mappings Matthew Wilcox (Oracle)
2020-10-29 19:34 ` [PATCH 19/19] selftests/vm/transhuge-stress: Support file-backed THPs Matthew Wilcox (Oracle)
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