linux-kernel - Re: [PATCH v2 1/4] mm: refactoring TLB gathering API

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Message-ID: <20170802005654.GB6388@bbox>
Date:   Wed, 2 Aug 2017 09:56:54 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team <kernel-team@....com>,
        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,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH v2 1/4] mm: refactoring TLB gathering API

Hi Mel,

On Tue, Aug 01, 2017 at 11:30:55AM +0100, Mel Gorman wrote:
> On Tue, Aug 01, 2017 at 02:56:14PM +0900, Minchan Kim wrote:
> > This patch is ready for solving race problems caused by TLB batch.
> 
> s/is ready/is a preparatory patch/
> 
> > 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.
> > 
> > It shouldn't change any behavior.
> > 
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Russell King <linux@...linux.org.uk>
> > Cc: Tony Luck <tony.luck@...el.com>
> > Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> > Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> > Cc: Jeff Dike <jdike@...toit.com>
> > Cc: linux-arch@...r.kernel.org
> > Cc: Nadav Amit <nadav.amit@...il.com>
> > Cc: Mel Gorman <mgorman@...hsingularity.net>
> > Signed-off-by: Minchan Kim <minchan@...nel.org>
> 
> You could alias arch_generic_tlb_finish_mmu as arch_tlb_gather_mmu
> simiilar to how other arch-generic helpers are done to avoid some
> #ifdeffery but otherwise

Good idea. With Andrew's suggestion, Nadav will resend whole series
including his patchset. I asked to him to fix it when he respin.

> 
> Acked-by: Mel Gorman <mgorman@...hsingularity.net>

Thanks for the review!