linux-kernel - Re: [PATCH v11 02/12] scs: add accounting

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Message-ID: <20200420212114.GA77284@google.com>
Date:   Mon, 20 Apr 2020 14:21:14 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 02/12] scs: add accounting

On Mon, Apr 20, 2020 at 06:17:55PM +0100, Will Deacon wrote:
> > +#ifdef CONFIG_SHADOW_CALL_STACK
> > +		       nid, sum_zone_node_page_state(nid, NR_KERNEL_SCS_BYTES) / 1024,
> > +#endif
> 
> Why not just use KB everywhere instead of repeated division by 1024?

This was to correctly calculate memory usage with shadow stacks <1024
bytes. I don't think we need that anymore, so I'll change this to _KB in
the next version.

Sami