From: Matthew Wilcox <willy@infradead.org>
To: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
William Kucharski <william.kucharski@oracle.com>
Subject: Re: [PATCH 09/12] mm/readahead: Align file mappings for non-DAX
Date: Mon, 17 Jan 2022 04:40:33 +0000 [thread overview]
Message-ID: <YeTzQU+JR43x6kha@casper.infradead.org> (raw)
In-Reply-To: <d4ac99a0-6c45-e81b-c08a-56083c4cdd6e@linux.alibaba.com>
On Mon, Jan 17, 2022 at 11:17:55AM +0800, Rongwei Wang wrote:
> It seems this patch will make all file mappings align with PMD_SIZE?
Only those which are big enough. See __thp_get_unmapped_area():
if (off_end <= off_align || (off_end - off_align) < size)
return 0;
> And
> support realize all file THP, not only executable file THP?
Executables are not the only files which benefit from being mapped
to an aligned address. If you can use a PMD to map a font file,
for example, that's valuable.
next prev parent reply other threads:[~2022-01-17 4:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-16 12:18 [PATCH 00/12] Enabling large folios for 5.17 Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 01/12] mm: Add folio_put_refs() Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 02/12] filemap: Use folio_put_refs() in filemap_free_folio() Matthew Wilcox (Oracle)
2022-01-17 15:56 ` Kirill A. Shutemov
2022-01-17 16:11 ` Matthew Wilcox
2022-01-16 12:18 ` [PATCH 03/12] filemap: Allow large folios to be added to the page cache Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 04/12] mm/vmscan: Free non-shmem folios without splitting them Matthew Wilcox (Oracle)
2022-01-17 16:06 ` Kirill A. Shutemov
2022-01-17 16:10 ` Matthew Wilcox
2022-01-17 21:00 ` Kirill A. Shutemov
2022-01-16 12:18 ` [PATCH 05/12] mm: Fix READ_ONLY_THP warning Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 06/12] mm/vmscan: Optimise shrink_page_list for non-PMD-sized folios Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 07/12] mm: Make large folios depend on THP Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 08/12] mm/readahead: Add large folio readahead Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 09/12] mm/readahead: Align file mappings for non-DAX Matthew Wilcox (Oracle)
2022-01-17 3:17 ` Rongwei Wang
2022-01-17 4:40 ` Matthew Wilcox [this message]
2022-01-16 12:18 ` [PATCH 10/12] mm/readahead: Switch to page_cache_ra_order Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 11/12] mm/filemap: Support VM_HUGEPAGE for file mappings Matthew Wilcox (Oracle)
2022-01-16 12:18 ` [PATCH 12/12] selftests/vm/transhuge-stress: Support file-backed PMD folios Matthew Wilcox (Oracle)
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