From: Mateusz Guzik <mjguzik@gmail.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: brauner@kernel.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/3] ns: pad refcount
Date: Sun, 23 Nov 2025 20:47:46 +0100 [thread overview]
Message-ID: <CAGudoHEsUV+fe4vY7G0FF3T_bki=Nh-QxmLk29+s6ySMqyf-Eg@mail.gmail.com> (raw)
In-Reply-To: <aSNZVv6BZCZcRsgs@redhat.com>
On Sun, Nov 23, 2025 at 7:58 PM Oleg Nesterov <oleg@redhat.com> wrote:
>
> On 11/23, Mateusz Guzik wrote:
> >
> > struct ns_common {
> > + struct {
> > + refcount_t __ns_ref; /* do not use directly */
> > + } ____cacheline_aligned_in_smp;
>
> Cough... stupid question. Why not just
>
> refcount_t __ns_ref ____cacheline_aligned_in_smp;
>
> ? why do we need the anonymous struct?
>
This would merely align the offset of the field, with the rest
directly following.
next prev parent reply other threads:[~2025-11-23 19:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-23 6:30 [PATCH 0/3] further damage-control lack of clone scalability Mateusz Guzik
2025-11-23 6:30 ` [PATCH 1/3] idr: add idr_prealloc_many Mateusz Guzik
2025-11-23 6:30 ` [PATCH 2/3] ns: pad refcount Mateusz Guzik
2025-11-23 18:58 ` Oleg Nesterov
2025-11-23 19:47 ` Mateusz Guzik [this message]
2025-11-24 18:25 ` Oleg Nesterov
2025-11-23 6:30 ` [PATCH 3/3] pid: only take pidmap_lock once on alloc Mateusz Guzik
2025-11-23 20:09 ` Oleg Nesterov
2025-11-23 22:48 ` Mateusz Guzik
2025-11-23 15:00 ` [PATCH 0/3] further damage-control lack of clone scalability Matthew Wilcox
2025-11-23 16:39 ` Mateusz Guzik
2025-11-23 21:45 ` Matthew Wilcox
2025-11-23 22:33 ` Mateusz Guzik
2025-11-24 4:03 ` Mateusz Guzik
2025-12-03 8:37 ` Mateusz Guzik
2025-12-03 9:18 ` Mateusz Guzik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAGudoHEsUV+fe4vY7G0FF3T_bki=Nh-QxmLk29+s6ySMqyf-Eg@mail.gmail.com' \
--to=mjguzik@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=brauner@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=oleg@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox