linux-kernel - Re: [RFC 2/2] mm: Defer TLB flush by keeping both src and dst folios at migration

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Message-ID: <20230807050531.GB49200@system.software.com>
Date:   Mon, 7 Aug 2023 14:05:31 +0900
From:   Byungchul Park <byungchul@...com>
To:     Nadav Amit <namit@...are.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        "kernel_team@...ynix.com" <kernel_team@...ynix.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "ying.huang@...el.com" <ying.huang@...el.com>,
        "xhao@...ux.alibaba.com" <xhao@...ux.alibaba.com>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        Hugh Dickins <hughd@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [RFC 2/2] mm: Defer TLB flush by keeping both src and dst folios
 at migration

On Fri, Aug 04, 2023 at 05:32:30PM +0000, Nadav Amit wrote:
> The patch in its current form, I am afraid, is very very hard to review.
> It is way too big and is missing comments. Having CONFIG_MIGRC makes no
> sense (I guess it is intended to be a “chicken-bit”). Variable and
> function names are not informative. The memory barriers are handle
> improperly (please check again the smp_mb__after_atomic() rules).

I checked it. I found what I was wrong at. Thank you for pointing it out.
I will fix it from the next spin.

	Byungchul