linux-kernel - Re: [PATCH v3 0/9] x86: Concurrent TLB flushes

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Message-ID: <21b9c9f2-de63-71e9-34e3-8206b778f8b7@intel.com>
Date:   Fri, 19 Jul 2019 14:36:00 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Nadav Amit <namit@...are.com>, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Sasha Levin <sashal@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        kvm@...r.kernel.org, linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 0/9] x86: Concurrent TLB flushes

Thanks for doing this, it's something I've been hoping someone would do
for a long time.

While I kinda wish we had performance data for each individual patch (at
least the behavior-changing ones), this does look like a good
improvement.  That might, for instance, tell is a bit about how the
separating out "is_lazy" compares to the "check before setting"
optimization.  But, they're both sane enough on their own that I'm not
too worried.

I had some nits that I hope get covered in later revisions, if sent.
But, overall looks fine.  For the series:

Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>