From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72])
	by kanga.kvack.org (Postfix) with ESMTP id E1CA66B0279
	for <linux-mm@kvack.org>; Mon, 17 Jul 2017 05:57:19 -0400 (EDT)
Received: by mail-wm0-f72.google.com with SMTP id m81so123084wmh.6
        for <linux-mm@kvack.org>; Mon, 17 Jul 2017 02:57:19 -0700 (PDT)
Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15])
        by mx.google.com with ESMTPS id r186si9239379wmf.157.2017.07.17.02.57.17
        for <linux-mm@kvack.org>
        (version=TLS1 cipher=AES128-SHA bits=128/128);
        Mon, 17 Jul 2017 02:57:18 -0700 (PDT)
Date: Mon, 17 Jul 2017 10:57:15 +0100
From: Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH v4 00/10] PCID and improved laziness
Message-ID: <20170717095715.yzmuhhp6txqsxtpf@suse.de>
References: <cover.1498751203.git.luto@kernel.org>
 <20170705085657.eghd4xbv7g7shf5v@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-15
Content-Disposition: inline
In-Reply-To: <20170705085657.eghd4xbv7g7shf5v@gmail.com>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>, x86@kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Nadav Amit <nadav.amit@gmail.com>, Rik van Riel <riel@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Arjan van de Ven <arjan@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>

On Wed, Jul 05, 2017 at 10:56:57AM +0200, Ingo Molnar wrote:
> 
> * Andy Lutomirski <luto@kernel.org> wrote:
> 
> > *** Ingo, even if this misses 4.13, please apply the first patch before
> > *** the merge window.
> 
> > Andy Lutomirski (10):
> >   x86/mm: Don't reenter flush_tlb_func_common()
> >   x86/mm: Delete a big outdated comment about TLB flushing
> >   x86/mm: Give each mm TLB flush generation a unique ID
> >   x86/mm: Track the TLB's tlb_gen and update the flushing algorithm
> >   x86/mm: Rework lazy TLB mode and TLB freshness tracking
> >   x86/mm: Stop calling leave_mm() in idle code
> >   x86/mm: Disable PCID on 32-bit kernels
> >   x86/mm: Add nopcid to turn off PCID
> >   x86/mm: Enable CR4.PCIDE on supported systems
> >   x86/mm: Try to preserve old TLB entries using PCID
> 
> So this series is really nice, and the first two patches are already upstream, and 
> I've just applied all but the final patch to tip:x86/mm (out of caution - I'm a wimp).
> 
> That should already offer some improvements and enables the CR4 bit - but doesn't 
> actually use the PCID hardware yet.
> 
> I'll push it all out when it passes testing.
> 
> If it's all super stable I plan to tempt Linus with a late merge window pull 
> request for all these preparatory patches. (Unless he objects that is. Hint, hint.)
> 
> Any objections?
> 

What was the final verdict here? I have a patch ready that should be layered
on top which will need a backport. PCID support does not appear to have
made it in this merge window so I'm wondering if I should send the patch
as-is for placement on top of Andy's work or go with the backport and
apply a follow-on patch after Andy's work gets merged.

Thanks.

-- 
Mel Gorman
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>