From: Linus Torvalds <torvalds@linux-foundation.org>
To: David Hildenbrand <david@redhat.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>,
linux-kernel@vger.kernel.org, patches@lists.linux.dev,
tglx@linutronix.de, linux-crypto@vger.kernel.org,
linux-api@vger.kernel.org, x86@kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>,
"Carlos O'Donell" <carlos@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
Arnd Bergmann <arnd@arndb.de>, Jann Horn <jannh@google.com>,
Christian Brauner <brauner@kernel.org>,
David Hildenbrand <dhildenb@redhat.com>,
linux-mm@kvack.org
Subject: Re: [PATCH v22 1/4] mm: add MAP_DROPPABLE for designating always lazily freeable mappings
Date: Thu, 11 Jul 2024 12:17:40 -0700 [thread overview]
Message-ID: <CAHk-=wjVc6cpSCJwAqrhPvwBbcQEOL2TEnCELfadhA=n1GN4Ww@mail.gmail.com> (raw)
In-Reply-To: <37da7835-0d76-463e-b074-455e405b138b@redhat.com>
On Thu, 11 Jul 2024 at 12:08, David Hildenbrand <david@redhat.com> wrote:
>
> We also have these folio_mark_dirty() calls, for example in
> unpin_user_pages_dirty_lock(). Hm ... so preventing the folio from
> getting dirtied is likely shaky.
I do wonder if we should just disallow page pinning for these pages
entirely. When the page can get replaced by zeroes at any time,
pinning it doesn't make much sense.
Except we do have that whole "fast" case that intentionally doesn't
take locks and doesn't have a vma. Darn.
Linus
next prev parent reply other threads:[~2024-07-11 19:18 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240709130513.98102-1-Jason@zx2c4.com>
2024-07-09 13:05 ` Jason A. Donenfeld
2024-07-10 3:27 ` David Hildenbrand
2024-07-10 4:05 ` David Hildenbrand
2024-07-11 0:44 ` Jason A. Donenfeld
2024-07-11 4:32 ` Jason A. Donenfeld
2024-07-11 4:46 ` David Hildenbrand
2024-07-11 5:07 ` Linus Torvalds
2024-07-11 17:09 ` Jason A. Donenfeld
2024-07-11 17:17 ` Jason A. Donenfeld
2024-07-11 17:24 ` David Hildenbrand
2024-07-11 17:27 ` David Hildenbrand
2024-07-11 17:54 ` Jason A. Donenfeld
2024-07-11 17:56 ` Jason A. Donenfeld
2024-07-11 18:08 ` Jason A. Donenfeld
2024-07-11 18:24 ` David Hildenbrand
2024-07-11 18:54 ` Jason A. Donenfeld
2024-07-11 18:56 ` David Hildenbrand
2024-07-11 19:18 ` David Hildenbrand
2024-07-11 19:20 ` David Hildenbrand
2024-07-11 19:49 ` Yu Zhao
2024-07-11 19:52 ` Yu Zhao
2024-07-11 19:53 ` David Hildenbrand
2024-07-11 19:58 ` Yu Zhao
2024-07-11 20:59 ` David Hildenbrand
2024-07-11 20:20 ` Jason A. Donenfeld
2024-07-11 20:59 ` David Hildenbrand
2024-07-11 17:49 ` Jason A. Donenfeld
2024-07-11 17:57 ` Linus Torvalds
2024-07-11 19:07 ` David Hildenbrand
2024-07-11 19:17 ` Linus Torvalds [this message]
2024-07-11 19:22 ` David Hildenbrand
2024-07-11 20:07 ` Jason A. Donenfeld
2024-07-11 20:17 ` Jason A. Donenfeld
2024-07-11 22:29 ` David Hildenbrand
2024-07-12 1:21 ` Jason A. Donenfeld
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