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SubjectRe: [PATCH v5 08/10] mm/ksm: Convert chain series funcs and replace get_ksm_page
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On 11.04.24 08:17, alexs@kernel.org wrote:
> From: "Alex Shi (tencent)" <alexs@kernel.org>
>
> In ksm stable tree all page are single, let's convert them to use and
> folios as well as stable_tree_insert/stable_tree_search funcs.
> And replace get_ksm_page() by ksm_get_folio() since there is no more
> needs.
>
> It could save a few compound_head calls.
>
> Cc: Izik Eidus <izik.eidus@ravellosystems.com>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Chris Wright <chrisw@sous-sol.org>
> Signed-off-by: Alex Shi (tencent) <alexs@kernel.org>
> ---

Nit: "mm/ksm: convert ..." so in your series all start lowercase :)

[...]

> @@ -3244,7 +3238,7 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio)
> /*
> * newfolio->mapping was set in advance; now we need smp_wmb()
> * to make sure that the new stable_node->kpfn is visible
> - * to get_ksm_page() before it can see that folio->mapping
> + * to ksm_get_folio() before it can see that folio->mapping
> * has gone stale (or that folio_test_swapcache has been cleared).
> */
> smp_wmb();
> @@ -3271,7 +3265,7 @@ static bool stable_node_dup_remove_range(struct ksm_stable_node *stable_node,
> if (stable_node->kpfn >= start_pfn &&
> stable_node->kpfn < end_pfn) {
> /*
> - * Don't get_ksm_page, page has already gone:
> + * Don't ksm_get_folio, page has already gone:
> * which is why we keep kpfn instead of page*
> */
> remove_node_from_stable_tree(stable_node);
> @@ -3359,7 +3353,7 @@ static int ksm_memory_callback(struct notifier_block *self,
> * Most of the work is done by page migration; but there might
> * be a few stable_nodes left over, still pointing to struct
> * pages which have been offlined: prune those from the tree,
> - * otherwise get_ksm_page() might later try to access a
> + * otherwise ksm_get_folio() might later try to access a
> * non-existent struct page.
> */
> ksm_check_stable_tree(mn->start_pfn,
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 73a052a382f1..9f0494fd902c 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -616,7 +616,7 @@ void folio_migrate_flags(struct folio *newfolio, struct folio *folio)
> folio_migrate_ksm(newfolio, folio);
> /*
> * Please do not reorder this without considering how mm/ksm.c's
> - * get_ksm_page() depends upon ksm_migrate_page() and PageSwapCache().
> + * ksm_get_folio() depends upon ksm_migrate_page() and PageSwapCache().
> */
> if (folio_test_swapcache(folio))
> folio_clear_swapcache(folio);

I'd have moved these 3 into a separate patch, but fine with me

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Cheers,

David / dhildenb


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