linux-kernel - Re: [PATCH v6 4/7] mm: refactoring TLB gathering API

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Message-ID: <20170811092334.rmeazkklvordrmrl@hirez.programming.kicks-ass.net>
Date:   Fri, 11 Aug 2017 11:23:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     linux-mm@...ck.org, nadav.amit@...il.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        Minchan Kim <minchan@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Jeff Dike <jdike@...toit.com>, linux-arch@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH v6 4/7] mm: refactoring TLB gathering API

On Tue, Aug 01, 2017 at 05:08:15PM -0700, Nadav Amit wrote:
> From: Minchan Kim <minchan@...nel.org>
> 
> This patch is a preparatory patch for solving race problems caused by
> TLB batch.  For that, we will increase/decrease TLB flush pending count
> of mm_struct whenever tlb_[gather|finish]_mmu is called.
> 
> Before making it simple, this patch separates architecture specific
> part and rename it to arch_tlb_[gather|finish]_mmu and generic part
> just calls it.

I absolutely hate this. We should unify this stuff, not diverge it
further.