linux-kernel - Re: [RFC PATCH 1/4] mm, hugetlb: unclutter hugetlb allocation layers

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Message-ID: <20170614140450.GQ6045@dhcp22.suse.cz>
Date:   Wed, 14 Jun 2017 16:04:50 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/4] mm, hugetlb: unclutter hugetlb allocation layers

On Wed 14-06-17 15:42:58, Michal Hocko wrote:
> On Wed 14-06-17 15:18:26, Vlastimil Babka wrote:
> > On 06/13/2017 11:00 AM, Michal Hocko wrote:
> [...]
> > > @@ -1717,13 +1640,22 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
> > >  		page = dequeue_huge_page_node(h, nid);
> > >  	spin_unlock(&hugetlb_lock);
> > >  
> > > -	if (!page)
> > > -		page = __alloc_buddy_huge_page_no_mpol(h, nid);
> > > +	if (!page) {
> > > +		nodemask_t nmask;
> > > +
> > > +		if (nid != NUMA_NO_NODE) {
> > > +			nmask = NODE_MASK_NONE;
> > > +			node_set(nid, nmask);
> > 
> > TBH I don't like this hack too much, and would rather see __GFP_THISNODE
> > involved, which picks a different (short) zonelist. Also it's allocating
> > nodemask on stack, which we generally avoid? Although the callers
> > currently seem to be shallow.
> 
> Fair enough. That would require pulling gfp mask handling up the call
> chain. This on top of this patch + refreshes for other patches later in
> the series as they will conflict now?

I've rebase the attempts/hugetlb-zonelists branch for an easier review.
-- 
Michal Hocko
SUSE Labs