From: Jan Kara <jack@suse.cz>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Hugh Dickins <hughd@google.com>,
William Kucharski <william.kucharski@oracle.com>,
Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/7] mm: Use pagevec_lookup in shmem_unlock_mapping
Date: Fri, 21 Aug 2020 17:53:51 +0200 [thread overview]
Message-ID: <20200821155351.GD3432@quack2.suse.cz> (raw)
In-Reply-To: <20200819150555.31669-2-willy@infradead.org>
On Wed 19-08-20 16:05:49, Matthew Wilcox (Oracle) wrote:
> The comment shows that the reason for using find_get_entries() is now
> stale; find_get_pages() will not return 0 if it hits a consecutive run
> of swap entries, and I don't believe it has since 2011. pagevec_lookup()
> is a simpler function to use than find_get_pages(), so use it instead.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> mm/shmem.c | 11 +----------
> 1 file changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 271548ca20f3..a7bbc4ed9677 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -840,7 +840,6 @@ unsigned long shmem_swap_usage(struct vm_area_struct *vma)
> void shmem_unlock_mapping(struct address_space *mapping)
> {
> struct pagevec pvec;
> - pgoff_t indices[PAGEVEC_SIZE];
> pgoff_t index = 0;
>
> pagevec_init(&pvec);
> @@ -848,16 +847,8 @@ void shmem_unlock_mapping(struct address_space *mapping)
> * Minor point, but we might as well stop if someone else SHM_LOCKs it.
> */
> while (!mapping_unevictable(mapping)) {
> - /*
> - * Avoid pagevec_lookup(): find_get_pages() returns 0 as if it
> - * has finished, if it hits a row of PAGEVEC_SIZE swap entries.
> - */
> - pvec.nr = find_get_entries(mapping, index,
> - PAGEVEC_SIZE, pvec.pages, indices);
> - if (!pvec.nr)
> + if (!pagevec_lookup(&pvec, mapping, &index))
> break;
> - index = indices[pvec.nr - 1] + 1;
> - pagevec_remove_exceptionals(&pvec);
> check_move_unevictable_pages(&pvec);
> pagevec_release(&pvec);
> cond_resched();
> --
> 2.28.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2020-08-21 15:53 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 15:05 [PATCH 0/7] Overhaul find_get_entries and pagevec_lookup_entries Matthew Wilcox (Oracle)
2020-08-19 15:05 ` [PATCH 1/7] mm: Use pagevec_lookup in shmem_unlock_mapping Matthew Wilcox (Oracle)
2020-08-21 15:53 ` Jan Kara [this message]
2020-08-19 15:05 ` [PATCH 2/7] mm: Rewrite shmem_seek_hole_data Matthew Wilcox (Oracle)
2020-08-20 16:45 ` Mike Rapoport
2020-08-20 19:04 ` Matthew Wilcox
2020-08-19 15:05 ` [PATCH 3/7] mm: Add an 'end' parameter to find_get_entries Matthew Wilcox (Oracle)
2020-08-20 16:47 ` Mike Rapoport
2020-08-21 16:07 ` Jan Kara
2020-08-21 16:33 ` Matthew Wilcox
2020-08-21 18:06 ` Jan Kara
2020-08-19 15:05 ` [PATCH 4/7] mm: Add an 'end' parameter to pagevec_lookup_entries Matthew Wilcox (Oracle)
2020-08-24 16:09 ` Jan Kara
2020-08-19 15:05 ` [PATCH 5/7] mm: Remove nr_entries parameter from pagevec_lookup_entries Matthew Wilcox (Oracle)
2020-08-24 16:10 ` Jan Kara
2020-08-19 15:05 ` [PATCH 6/7] mm: Pass pvec directly to find_get_entries Matthew Wilcox (Oracle)
2020-08-24 16:16 ` Jan Kara
2020-08-24 17:36 ` Matthew Wilcox
2020-08-25 12:33 ` Jan Kara
2020-08-25 13:28 ` Matthew Wilcox
2020-08-25 15:24 ` Jan Kara
2020-08-25 16:23 ` Johannes Weiner
2020-08-19 15:05 ` [PATCH 7/7] mm: Remove pagevec_lookup_entries Matthew Wilcox (Oracle)
2020-08-22 2:34 ` [PATCH 0/7] Overhaul find_get_entries and pagevec_lookup_entries William Kucharski
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