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

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Message-Id: <EBBFF419-4E4C-440A-853B-25FB6F0DE7F6@gmail.com>
Date:   Fri, 11 Aug 2017 10:12:45 -0700
From:   Nadav Amit <nadav.amit@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <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

Peter Zijlstra <peterz@...radead.org> wrote:

> 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.

Agreed, but I don’t see how this patch makes the situation any worse.

I’ll review your other comments by tomorrow due to some personal
constraints.