linux-kernel - Re: [External] Re: [PATCH] cgroup: rstat: Simplified cgroup_base_stat_flush() update last

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: <remnwctqmxleig7ywt6puhxnpmzjo7xm6hlfhpnul46ulfnw7j@36sbuxhuatto>
Date:   Wed, 24 May 2023 10:02:18 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Hao Jia <jiahao.os@...edance.com>
Cc:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [PATCH] cgroup: rstat: Simplified
 cgroup_base_stat_flush() update last_bstat logic

On Wed, May 24, 2023 at 02:54:10PM +0800, Hao Jia <jiahao.os@...edance.com> wrote:
> Yes, so we need @curr to record the bstat value after the sequence fetch is
> completed.

No, I still don't see a problem that it solves. If you find incorrect
data being reported, please explain it more/with an example.

> Yes, but it may not be obvious.
> Another reason is that when we complete an update, we snapshot last_bstat as
> the current bstat, which is better for readers to understand. Arithmetics is
> somewhat obscure.

The readability here is subjective. It'd be interesting to have some
data comparing arithmetics vs copying though.

HTH,
Michal

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)