Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 5 Dec 2018 11:24:53 -0800 (PST)
From:   David Rientjes <rientjes@google.com>
To:     Michal Hocko <mhocko@kernel.org>
cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>, ying.huang@intel.com,
        s.priebe@profihost.ag, mgorman@techsingularity.net,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        alex.williamson@redhat.com, lkp@01.org, kirill@shutemov.name,
        Andrew Morton <akpm@linux-foundation.org>,
        zi.yan@cs.rutgers.edu, Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [patch 1/2 for-4.20] mm, thp: restore node-local hugepage
 allocations
In-Reply-To: <20181205073434.GT1286@dhcp22.suse.cz>
Message-ID: <alpine.DEB.2.21.1812051120550.240991@chino.kir.corp.google.com>
References: <alpine.DEB.2.21.1812031545080.161134@chino.kir.corp.google.com> <alpine.DEB.2.21.1812031545560.161134@chino.kir.corp.google.com> <20181204073535.GV31738@dhcp22.suse.cz> <alpine.DEB.2.21.1812041355100.157466@chino.kir.corp.google.com>
 <20181205073434.GT1286@dhcp22.suse.cz>
User-Agent: Alpine 2.21 (DEB 202 2017-01-01)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, 5 Dec 2018, Michal Hocko wrote:

> > > At minimum do not remove the cleanup part which consolidates the gfp
> > > hadnling to a single place. There is no real reason to have the
> > > __GFP_THISNODE ugliness outside of alloc_hugepage_direct_gfpmask.
> > > 
> > 
> > The __GFP_THISNODE usage is still confined to 
> > alloc_hugepage_direct_gfpmask() for the thp fault path, we no longer set 
> > it in alloc_pages_vma() as done before the cleanup.
> 
> Why should be new_page any different?
> 

To match alloc_new_node_page() which does it correctly and does not change 
the behavior of mbind() that the cleanup did, which used 
alloc_hugepage_vma() to get the __GFP_THISNODE behavior.  If there is a 
reason mbind() is somehow different wrt allocating hugepages locally, I 
think that should be a separate patch, but the goal of this patch is to 
revert all the behavioral change that caused hugepages to be allocated 
remotely.