From: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
To: Ye Liu <ye.liu@linux.dev>, Andrew Morton <akpm@linux-foundation.org>
Cc: Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <jackmanb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/6] mm/page_owner: extract skip_buddy_pages() helper to unify buddy page skipping
Date: Mon, 29 Jun 2026 09:32:50 +0200 [thread overview]
Message-ID: <078000c4-9786-42f6-9228-eb9894a26b30@kernel.org> (raw)
In-Reply-To: <20260626024550.25677-2-ye.liu@linux.dev>
On 6/26/26 04:45, Ye Liu wrote:
> Three places in page_owner.c duplicate the same pattern: check if a
> page is PageBuddy, read its order via buddy_order_unsafe(), advance
> the pfn past the buddy block if the order is valid, and continue.
>
> Consolidate them into a single inline helper skip_buddy_pages().
> The function returns true (skip) for any buddy page and advances
> @pfn past the block when the order is valid; returns false if the
> page is not a buddy page and should be processed normally.
>
> The old init_pages_in_zone() variant used "order > 0" as an extra
> guard before advancing pfn, but the continue was unconditional and
> (1UL << 0) - 1 == 0, so the behaviour is identical. The comment
> about zone->lock is preserved in the helper's kernel-doc.
>
> No functional change.
>
> Signed-off-by: Ye Liu <ye.liu@linux.dev>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
next prev parent reply other threads:[~2026-06-29 7:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-26 2:45 [PATCH v2 0/6] mm/page_owner: misc cleanups Ye Liu
2026-06-26 2:45 ` [PATCH v2 1/6] mm/page_owner: extract skip_buddy_pages() helper to unify buddy page skipping Ye Liu
2026-06-26 18:35 ` Zi Yan
2026-06-29 7:32 ` Vlastimil Babka (SUSE) [this message]
2026-06-26 2:45 ` [PATCH v2 2/6] mm/page_owner: use MIGRATE_REASON_NONE instead of -1 for last_migrate_reason Ye Liu
2026-06-26 18:45 ` Zi Yan
2026-06-29 2:20 ` Ye Liu
2026-06-29 8:00 ` Vlastimil Babka (SUSE)
2026-06-26 2:45 ` [PATCH v2 3/6] mm/page_owner: hoist CONFIG_MEMCG to function level for print_page_owner_memcg() Ye Liu
2026-06-26 18:52 ` Zi Yan
2026-06-29 8:09 ` Vlastimil Babka (SUSE)
2026-06-26 2:45 ` [PATCH v2 4/6] mm/page_owner: add missing newline to count_threshold format string Ye Liu
2026-06-26 18:53 ` Zi Yan
2026-06-29 8:11 ` Vlastimil Babka (SUSE)
2026-06-26 2:45 ` [PATCH v2 5/6] mm/page_owner: move free_ts_nsec output to free section in __dump_page_owner() Ye Liu
2026-06-26 18:55 ` Zi Yan
2026-06-29 2:36 ` Ye Liu
2026-06-29 2:59 ` Zi Yan
2026-06-29 8:13 ` Vlastimil Babka (SUSE)
2026-06-26 2:45 ` [PATCH v2 6/6] mm/page_owner: drop redundant page_owner prefix from static symbols Ye Liu
2026-06-26 18:56 ` Zi Yan
2026-06-29 8:15 ` Vlastimil Babka (SUSE)
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