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Date:   Wed, 11 Oct 2023 10:16:17 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Mel Gorman <mgorman@techsingularity.net>
Cc:     Huang Ying <ying.huang@intel.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Arjan Van De Ven <arjan@linux.intel.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        David Hildenbrand <david@redhat.com>,
        Johannes Weiner <jweiner@redhat.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Michal Hocko <mhocko@suse.com>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        Matthew Wilcox <willy@infradead.org>,
        Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH 01/10] mm, pcp: avoid to drain PCP when process exit
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On Wed, 11 Oct 2023 13:46:10 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:

> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -676,12 +676,15 @@ enum zone_watermarks {
> >  #define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost)
> >  #define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost)
> >  
> > +#define	PCPF_PREV_FREE_HIGH_ORDER	0x01
> > +
> 
> The meaning of the flag and its intent should have been documented.

I need to rebase mm-stable for other reasons.  So let's please
decide (soon) whether Mel's review comments can be addressed
via add-on patches or whether I should drop this version of this
series altogether, during that rebase.