From: Gregory Price <gregory.price@memverge.com>
To: Rik van Riel <riel@surriel.com>
Cc: Gregory Price <gourry.memverge@gmail.com>,
linux-mm@kvack.org, akpm@linux-foundation.org,
willy@infradead.org, david@redhat.com, vbabka@suse.cz,
naoya.horiguchi@linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kpageflags: respect folio head-page flag placement
Date: Thu, 26 Oct 2023 15:12:41 -0400 [thread overview]
Message-ID: <ZTq6KRn9tKp5KOJA@memverge.com> (raw)
In-Reply-To: <3ac68b3be0f62cfcd930ee84b87fbdc8244fe45e.camel@surriel.com>
On Wed, Oct 25, 2023 at 09:34:15PM -0400, Rik van Riel wrote:
> On Wed, 2023-10-25 at 16:12 -0400, Gregory Price wrote:
> > u |= kpf_copy_bit(k, KPF_SWAPBACKED, PG_swapbacked);
> >
>
> Aren't PG_locked, PG_reclaim, and PG_swapbacked also maintained only on
> the folio/head?
>
> Would it make sense to convert those over as well?
>
I see them registered as PF_NO_TAIL in include/linux/page-flags.h
Certainly i think there are other updates that are likely needed, but
I wasn't quite sure how to handle ONLY_HEAD and NO_TAIL and other
conditionals. Should the bits always be 0 or should it refer to HEAD?
Just not sure at the moment.
~Gregory
next prev parent reply other threads:[~2023-10-26 19:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-25 20:12 Gregory Price
2023-10-26 1:34 ` Rik van Riel
2023-10-26 19:12 ` Gregory Price [this message]
2023-10-26 20:00 ` Matthew Wilcox
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