linux-kernel - Re: [PATCH -v2 1/4] mm: Rework {set,clear,mm}_tlb_flush

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Message-ID: <20170802141637.77maxxkwbjgl7juz@hirez.programming.kicks-ass.net>
Date:   Wed, 2 Aug 2017 16:16:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...e.de>
Cc:     torvalds@...ux-foundation.org, will.deacon@....com,
        oleg@...hat.com, paulmck@...ux.vnet.ibm.com,
        benh@...nel.crashing.org, mpe@...erman.id.au, npiggin@...il.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        stern@...land.harvard.edu, Russell King <linux@...linux.org.uk>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH -v2 1/4] mm: Rework {set,clear,mm}_tlb_flush_pending()

On Wed, Aug 02, 2017 at 02:52:03PM +0100, Mel Gorman wrote:
> On Wed, Aug 02, 2017 at 03:05:50PM +0200, Peter Zijlstra wrote:
> > On Wed, Aug 02, 2017 at 02:00:40PM +0100, Mel Gorman wrote:
> > > On Wed, Aug 02, 2017 at 01:38:38PM +0200, Peter Zijlstra wrote:
> > > > For this to work we need to rework migrate_misplaced_transhuge_page()
> > > > a little and move the test up into do_huge_pmd_numa_page().
> > > > 
> > > 
> > > Note that Nadav has a patch in parallel on it's way towards Andrew's
> > > tree that I suggested to always always check if a TLB flush is pending
> > > under the PTL. A conflict will happen but will be trivial to resolve.
> > 
> > Got a link?
> 
> Subject: Revert "mm: numa: defer TLB flush for THP migration as long as possible"
> 
> http://lkml.kernel.org/r/20170731164325.235019-4-namit@vmware.com
> 

Thanks, yes that should be easy to resolve.