From: Matthew Wilcox <willy@infradead.org>
To: Rafael Aquini <aquini@redhat.com>
Cc: akpm@linux-foundation.org, hca@linux.ibm.com,
kirill.shutemov@linux.intel.com, mm-commits@vger.kernel.org,
vbabka@suse.cz, vdavydov.dev@gmail.com, yuzhao@google.com
Subject: Re: + mm-mark-idle-page-tracking-as-broken.patch added to -mm tree
Date: Thu, 17 Jun 2021 16:37:17 +0100 [thread overview]
Message-ID: <YMtsLVyQsrROCeiG@casper.infradead.org> (raw)
In-Reply-To: <YMp7P/peGtRkfRQf@optiplex-fbsd>
On Wed, Jun 16, 2021 at 06:29:19PM -0400, Rafael Aquini wrote:
> > In discussion with other MM developers around how idle page tracking
> > should be fixed for transparent huge pages, several expressed the opinion
> > that it should be removed as it is inefficient at accomplishing the job
> > that it is supposed to, and we have better mechanisms (eg uffd) for
> > accomplishing the same goals these days.
>
> I didn't follow the aforementioned discussion, so it would be nice to
> have a little bit more detailed explanation on both points raised here
> (issues with THP and innefficiency). There are some Red Hat customers
> and partners that do rely on the feature, thus the interest. Thanks.
It would be nice if you asked this on the original thread (which you're
cc'd on) instead of starting a new thread.
> > Mark the feature as BROKEN for now and we can remove it entirely in a few
> > months if nobody complains. It is not enabled by Android, ChromeOS,
> > Debian, Fedora or SUSE. Red Hat enabled it with RHEL-8.1 and UEK followed
> > suit, but I have been unable to find why RHEL enabled it.
>
> minor nit on the RHEL mention: CONFIG_IDLE_PAGE_TRACKING is enabled since 8.0
> for RHEL-8, and 7.7 for RHEL-7.
Red Hat makes it incredibly hard to find out what changed when.
You can't then whine about us not understanding what you're doing,
when you're going out of your way to obfuscate what you do.
next prev parent reply other threads:[~2021-06-17 15:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-15 2:05 + mm-mark-idle-page-tracking-as-broken.patch added to -mm tree akpm
2021-06-16 22:29 ` Rafael Aquini
2021-06-17 15:37 ` Matthew Wilcox [this message]
2021-06-17 15:54 ` Rafael Aquini
2021-06-17 16:01 ` Matthew Wilcox
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