linux-kernel - Re: [PATCH 0/7] x86/mm/tlb: make lazy TLB mode even lazier

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Message-ID: <20181024055319.GA73309@gmail.com>
Date:   Wed, 24 Oct 2018 07:53:19 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Rik van Riel <riel@...riel.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        kernel-team@...com, songliubraving@...com, will.deacon@....com,
        hpa@...or.com, luto@...nel.org, npiggin@...il.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 0/7] x86/mm/tlb: make lazy TLB mode even lazier


* Rik van Riel <riel@...riel.com> wrote:

> The big thing remaining is the reference count overhead of
> the lazy TLB mm_struct, but getting rid of that is rather a
> lot of code for a small performance gain. Not quite what
> Linus asked for :)

BTW., what would be the plan to improve scalability there,
is it even possible?

Also, it would be nice to integrate some of those workloads
into a simple 'perf bench mm' or 'perf bench tlb' subcommand,
see tools/perf/bench/ on how to add benchmarking modules.

Thanks,

	Ingo