From: Michal Hocko <mhocko@suse.com>
To: David Hildenbrand <david@redhat.com>
Cc: Alexey Makhalov <amakhalov@vmware.com>,
Dennis Zhou <dennis@kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <osalvador@suse.de>, Tejun Heo <tj@kernel.org>,
Christoph Lameter <cl@linux.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH v3] mm: fix panic in __alloc_pages
Date: Wed, 8 Dec 2021 09:28:44 +0100 [thread overview]
Message-ID: <YbBsvDarxh0oGYXk@dhcp22.suse.cz> (raw)
In-Reply-To: <235e8656-a947-b446-c39c-fa0f72b65ac7@redhat.com>
On Tue 07-12-21 17:40:36, David Hildenbrand wrote:
> On 07.12.21 17:36, Michal Hocko wrote:
> > On Tue 07-12-21 17:27:29, Michal Hocko wrote:
> > [...]
> >> So your proposal is to drop set_node_online from the patch and add it as
> >> a separate one which handles
> >> - sysfs part (i.e. do not register a node which doesn't span a
> >> physical address space)
> >> - hotplug side of (drop the pgd allocation, register node lazily
> >> when a first memblocks are registered)
> >
>
> > In other words, the first stage
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index c5952749ad40..f9024ba09c53 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -6382,7 +6382,11 @@ static void __build_all_zonelists(void *data)
> > if (self && !node_online(self->node_id)) {
> > build_zonelists(self);
> > } else {
> > - for_each_online_node(nid) {
> > + /*
> > + * All possible nodes have pgdat preallocated
> > + * free_area_init
> > + */
> > + for_each_node(nid) {
> > pg_data_t *pgdat = NODE_DATA(nid);
> >
> > build_zonelists(pgdat);
> > @@ -8032,8 +8036,24 @@ void __init free_area_init(unsigned long *max_zone_pfn)
> > /* Initialise every node */
> > mminit_verify_pageflags_layout();
> > setup_nr_node_ids();
> > - for_each_online_node(nid) {
> > - pg_data_t *pgdat = NODE_DATA(nid);
> > + for_each_node(nid) {
> > + pg_data_t *pgdat;
> > +
> > + if (!node_online(nid)) {
> > + pr_warn("Node %d uninitialized by the platform. Please report with boot dmesg.\n", nid);
> > + pgdat = arch_alloc_nodedata(nid);
>
> Is the buddy fully up an running at that point? I don't think so, so we
> might have to allocate via memblock instead. But I might be wrong.
No, not only the page allocator is not ready but slab allocator used by
the generic implementation is not up yet either. I will look deeper into
this later today but I suspect the only choice is to use the memblock
allocator - same way the arch specific code allocates pgdats.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-12-08 8:29 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-01 20:13 [PATCH] mm: fix panic in __alloc_pages Alexey Makhalov
2021-11-01 20:38 ` Matthew Wilcox
2021-11-02 7:47 ` Michal Hocko
2021-11-02 8:12 ` David Hildenbrand
2021-11-02 8:48 ` Alexey Makhalov
2021-11-02 9:04 ` Michal Hocko
2021-11-02 9:24 ` David Hildenbrand
2021-11-02 10:34 ` Alexey Makhalov
2021-11-02 11:00 ` David Hildenbrand
2021-11-02 11:44 ` Michal Hocko
2021-11-02 12:06 ` David Hildenbrand
2021-11-02 12:27 ` Michal Hocko
2021-11-02 12:39 ` David Hildenbrand
2021-11-02 13:25 ` Michal Hocko
2021-11-02 13:41 ` David Hildenbrand
2021-11-02 14:12 ` Michal Hocko
2021-11-02 14:44 ` David Hildenbrand
2021-11-02 13:52 ` Oscar Salvador
2021-11-02 14:35 ` Michal Hocko
2021-11-08 6:12 ` Alexey Makhalov
2021-11-08 6:36 ` [PATCH v2] " Alexey Makhalov
2021-11-08 8:32 ` David Hildenbrand
2021-11-08 20:23 ` [PATCH v3] " Alexey Makhalov
2021-11-09 2:08 ` Eric Dumazet
2021-11-09 7:03 ` David Hildenbrand
2021-11-09 16:55 ` Eric Dumazet
2021-11-09 17:15 ` Michal Hocko
2021-11-09 19:06 ` Dennis Zhou
2021-11-09 19:54 ` Michal Hocko
2021-11-16 1:31 ` Alexey Makhalov
2021-11-16 9:17 ` Michal Hocko
2021-11-16 20:22 ` Alexey Makhalov
2021-11-18 8:35 ` Michal Hocko
2021-12-07 10:54 ` Michal Hocko
2021-12-07 11:08 ` David Hildenbrand
2021-12-07 12:13 ` Michal Hocko
2021-12-07 12:28 ` David Hildenbrand
2021-12-07 13:23 ` Michal Hocko
2021-12-07 15:09 ` David Hildenbrand
2021-12-07 15:29 ` Michal Hocko
2021-12-07 15:34 ` David Hildenbrand
2021-12-07 15:56 ` Michal Hocko
2021-12-07 16:09 ` David Hildenbrand
2021-12-07 16:27 ` Michal Hocko
2021-12-07 16:36 ` Michal Hocko
2021-12-07 16:40 ` David Hildenbrand
2021-12-08 8:28 ` Michal Hocko [this message]
2021-12-07 17:02 ` Alexey Makhalov
2021-12-07 17:13 ` David Hildenbrand
2021-12-07 17:17 ` Alexey Makhalov
2021-12-07 18:03 ` David Hildenbrand
2021-12-08 8:12 ` Michal Hocko
2021-12-08 8:24 ` David Hildenbrand
2021-12-08 8:34 ` Michal Hocko
2021-12-08 8:38 ` David Hildenbrand
2021-12-08 8:04 ` Michal Hocko
2021-12-08 8:19 ` Alexey Makhalov
2021-12-08 8:30 ` Michal Hocko
2021-12-08 8:54 ` Michal Hocko
2021-12-08 8:57 ` Alexey Makhalov
2021-12-08 9:55 ` Michal Hocko
2021-12-09 2:16 ` Alexey Makhalov
2021-12-09 8:46 ` Michal Hocko
2021-12-09 9:28 ` Alexey Makhalov
2021-12-09 9:56 ` Michal Hocko
2021-12-09 10:23 ` Alexey Makhalov
2021-12-09 13:29 ` Michal Hocko
2021-12-09 19:01 ` Alexey Makhalov
2021-12-10 9:11 ` Michal Hocko
2021-12-17 12:53 ` Michal Hocko
2021-12-21 5:46 ` Alexey Makhalov
2021-12-21 9:46 ` Michal Hocko
2021-12-21 20:23 ` Alexey Makhalov
2021-12-22 11:41 ` Michal Hocko
2021-12-09 10:48 ` Michal Hocko
2021-12-13 15:06 ` Michal Hocko
2021-12-13 15:07 ` David Hildenbrand
2021-12-14 8:38 ` Michal Hocko
2021-11-08 10:37 ` [PATCH v2] " Michal Hocko
2021-11-02 9:40 ` [PATCH] " Alexey Makhalov
2021-11-02 9:40 ` Michal Hocko
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