From: Oscar Salvador <osalvador@suse.de>
To: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>,
Muchun Song <songmuchun@bytedance.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 5/7] mm: Make alloc_contig_range handle free hugetlb pages
Date: Thu, 15 Apr 2021 10:28:23 +0200 [thread overview]
Message-ID: <YHf5J0YRtTAWCPAi@localhost.localdomain> (raw)
In-Reply-To: <71cce295-91d3-21d8-5075-04a2e828d0f2@redhat.com>
On Wed, Apr 14, 2021 at 02:26:21PM +0200, David Hildenbrand wrote:
> > +static inline int isolate_or_dissolve_huge_page(struct page *page)
> > +{
> > + return -ENOMEM;
>
> Without CONFIG_HUGETLB_PAGE, there is no way someone could possible pass in
> something valid. Although it doesn't matter too much, -EINVAL or similar
> sounds a bit better.
I guess we could, was just to make it consistent with the kind of error
we return when we have it enabled.
> > @@ -809,6 +809,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
> > bool skip_on_failure = false;
> > unsigned long next_skip_pfn = 0;
> > bool skip_updated = false;
> > + bool fatal_error = false;
>
> Can't we use "ret == -ENOMEM" instead of fatal_error?
Yes, we can, I will see how it looks.
[...]
> > + /*
> > + * Fence off gigantic pages as there is a cyclic dependency between
> > + * alloc_contig_range and them. Return -ENOME as this has the effect
>
> s/-ENOME/-ENOMEM/
thanks, I missed that one.
>
> > + * of bailing out right away without further retrying.
> > + */
> > + if (hstate_is_gigantic(h))
> > + return -ENOMEM;
> > +
> > + return alloc_and_dissolve_huge_page(h, head);
> > +}
> > +
> > struct page *alloc_huge_page(struct vm_area_struct *vma,
> > unsigned long addr, int avoid_reserve)
> > {
> >
>
> Complicated stuff, but looks good to me.
Thanks for having a look!
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2021-04-15 8:28 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 10:47 [PATCH v7 0/7] Make alloc_contig_range handle Hugetlb pages Oscar Salvador
2021-04-13 10:47 ` [PATCH v7 1/7] mm,page_alloc: Bail out earlier on -ENOMEM in alloc_contig_migrate_range Oscar Salvador
2021-04-13 17:00 ` Mike Kravetz
2021-04-13 10:47 ` [PATCH v7 2/7] mm,compaction: Let isolate_migratepages_{range,block} return error codes Oscar Salvador
2021-04-13 17:52 ` Mike Kravetz
2021-04-14 11:54 ` David Hildenbrand
2021-04-15 8:42 ` Oscar Salvador
2021-04-13 10:47 ` [PATCH v7 3/7] mm,hugetlb: Clear HPageFreed outside of the lock Oscar Salvador
2021-04-13 13:23 ` Michal Hocko
2021-04-13 21:19 ` Mike Kravetz
2021-04-14 6:04 ` Michal Hocko
2021-04-14 7:41 ` Oscar Salvador
2021-04-14 8:28 ` Michal Hocko
2021-04-14 10:01 ` Oscar Salvador
2021-04-14 10:03 ` Oscar Salvador
2021-04-14 10:32 ` Michal Hocko
2021-04-14 10:49 ` Oscar Salvador
2021-04-14 11:09 ` Michal Hocko
2021-04-14 12:02 ` David Hildenbrand
2021-04-14 16:45 ` Mike Kravetz
2021-04-13 10:47 ` [PATCH v7 4/7] mm,hugetlb: Split prep_new_huge_page functionality Oscar Salvador
2021-04-13 13:24 ` Michal Hocko
2021-04-13 13:26 ` Michal Hocko
2021-04-13 21:33 ` Mike Kravetz
2021-04-14 4:59 ` Oscar Salvador
2021-04-14 12:15 ` David Hildenbrand
2021-04-14 17:03 ` Mike Kravetz
2021-04-13 10:47 ` [PATCH v7 5/7] mm: Make alloc_contig_range handle free hugetlb pages Oscar Salvador
2021-04-13 13:40 ` Michal Hocko
2021-04-15 8:29 ` Oscar Salvador
2021-04-13 22:29 ` Mike Kravetz
2021-04-14 4:54 ` Oscar Salvador
2021-04-14 12:26 ` David Hildenbrand
2021-04-15 8:28 ` Oscar Salvador [this message]
2021-04-13 10:47 ` [PATCH v7 6/7] mm: Make alloc_contig_range handle in-use " Oscar Salvador
2021-04-13 22:48 ` Mike Kravetz
2021-04-14 4:52 ` Oscar Salvador
2021-04-14 17:07 ` Mike Kravetz
2021-04-13 10:47 ` [PATCH v7 7/7] mm,page_alloc: Drop unnecessary checks from pfn_range_valid_contig Oscar Salvador
2021-04-13 22:53 ` Mike Kravetz
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