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  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]
Date:   Wed, 26 Jun 2019 09:33:32 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Nadav Amit <namit@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 5/9] x86/mm/tlb: Optimize local TLB flushes

On Tue, Jun 25, 2019 at 2:36 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 6/12/19 11:48 PM, Nadav Amit wrote:
> > While the updated smp infrastructure is capable of running a function on
> > a single local core, it is not optimized for this case.
>
> OK, so flush_tlb_multi() is optimized for flushing local+remote at the
> same time and is also (near?) the most optimal way to flush remote-only.
>  But, it's not as optimized at doing local-only flushes.  But,
> flush_tlb_on_cpus() *is* optimized for local-only flushes.

Can we stick the optimization into flush_tlb_multi() in the interest
of keeping this stuff readable?

Also, would this series be easier to understand if there was a patch
to just remove the UV optimization before making other changes?

--Andy

Powered by blists - more mailing lists