From: Gregory Price <gourry@gourry.net>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-team@meta.com, akpm@linux-foundation.org, vbabka@suse.cz,
surenb@google.com, mhocko@suse.com, jackmanb@google.com,
ziy@nvidia.com, richard.weiyang@gmail.com, osalvador@suse.de,
rientjes@google.com, david@redhat.com, joshua.hahnjy@gmail.com,
fvdl@google.com
Subject: Re: [PATCH v5] page_alloc: allow migration of smaller hugepages during contig_alloc
Date: Thu, 18 Dec 2025 18:38:50 -0500 [thread overview]
Message-ID: <aUSQin8iN78L9gKU@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <aURXd7d1on5vxnnT@cmpxchg.org>
On Thu, Dec 18, 2025 at 02:35:19PM -0500, Johannes Weiner wrote:
> On Thu, Dec 18, 2025 at 02:08:31PM -0500, Gregory Price wrote:
> > + page = compound_head(page);
> > + order = compound_order(page);
> > + if ((order >= MAX_FOLIO_ORDER) ||
> > + (nr_pages <= (1 << order)))
> > + return false;
>
> If you keep searching past it, you can step over the whole page to
> speed things up a bit:
>
> i += (1 << order) - 1;
ack, good catch, added to v6
~Gregory
next prev parent reply other threads:[~2025-12-18 23:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-18 19:08 Gregory Price
2025-12-18 19:35 ` Johannes Weiner
2025-12-18 23:38 ` Gregory Price [this message]
2025-12-18 19:45 ` Zi Yan
2025-12-18 20:42 ` Gregory Price
2025-12-18 21:17 ` Zi Yan
2025-12-18 21:32 ` Gregory Price
2025-12-18 21:07 ` Gregory Price
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