linux-kernel - Re: [PATCH 06/25] hrtimer: Store running timer in hrtimer_clock

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: <20170925144434.he26rxtkkwqvbwkg@hirez.programming.kicks-ass.net>
Date:   Mon, 25 Sep 2017 16:44:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Anna-Maria Gleixner <anna-maria@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Christoph Hellwig <hch@....org>, keescook@...omium.org,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 06/25] hrtimer: Store running timer in hrtimer_clock_base

On Thu, Aug 31, 2017 at 12:23:36PM -0000, Anna-Maria Gleixner wrote:
> Unfortunately this makes cpu_clock base larger than 32 bytes on 32bit
> kernels. Instead of having huge gaps due to alignment, remove the alignment
> and let the compiler pack cpu base for 32bit. The resulting cache access
> patterns are fortunately not really different from the current
> behaviour.

How did you determine this? Perf lacks much useful tooling right about
there :/