linux-kernel - Re: [PATCH] mm, thp: relax __GFP_THISNODE for MADV

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Date:   Wed, 12 Sep 2018 17:25:53 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zi Yan <zi.yan@...rutgers.edu>,
        "Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Stefan Priebe <s.priebe@...fihost.ag>
Subject: Re: [PATCH] mm, thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings

On Wed 12-09-18 16:21:26, Michal Hocko wrote:
> On Wed 12-09-18 09:54:17, Andrea Arcangeli wrote:
[...]
> > I wasn't particularly happy about your patch because it still swaps
> > with certain defrag settings which is still allowing things that
> > shouldn't happen without some kind of privileged capability.
> 
> Well, I am not really sure about defrag=always. I would rather care
> about the default behavior to plug the regression first. And think about
> `always' mode on top. Or is this a no-go from your POV?

In other words the following on top
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 56c9aac4dc86..723e8d77c5ef 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -644,7 +644,7 @@ static inline gfp_t alloc_hugepage_direct_gfpmask(struct vm_area_struct *vma, un
 #endif
 
 	if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags))
-		return GFP_TRANSHUGE | (vma_madvised ? 0 : __GFP_NORETRY | this_node);
+		return GFP_TRANSHUGE | (vma_madvised ? 0 : __GFP_NORETRY);
 	if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, &transparent_hugepage_flags))
 		return GFP_TRANSHUGE_LIGHT | __GFP_KSWAPD_RECLAIM | this_node;
 	if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, &transparent_hugepage_flags))
-- 
Michal Hocko
SUSE Labs