linux-kernel - Re: [PATCH 14/21] binder: do not add pages to LRU in release path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231107090829.259753-1-aliceryhl@google.com>
Date:   Tue,  7 Nov 2023 09:08:29 +0000
From:   Alice Ryhl <aliceryhl@...gle.com>
To:     Carlos Llamas <cmllamas@...gle.com>
Cc:     "Arve Hjønnevåg" <arve@...roid.com>,
        Christian Brauner <brauner@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Martijn Coenen <maco@...roid.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Todd Kjos <tkjos@...roid.com>
Subject: Re: [PATCH 14/21] binder: do not add pages to LRU in release path

Carlos Llamas <cmllamas@...gle.com> writes:
> In binder_alloc_deferred_release() pages are added to the LRU list via
> binder_free_buf_locked(). However, this is pointless because these pages
> are kfree'd immediately afterwards. Add an option to skip the LRU list.

They aren't freed with kfree, buf with __free_page.
 
> Signed-off-by: Carlos Llamas <cmllamas@...gle.com>

The change itself looks correct, so I'll give my tag for this:

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

But I'm wondering whether process cleanup really is so performance
intensive to justify the added complexity of this?

Alice