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Date: Tue, 15 Dec 2020 17:01:33 +0800
From: Baoquan He <bhe@...hat.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, gopakumarr@...are.com,
akpm@...ux-foundation.org, natechancellor@...il.com,
ndesaulniers@...gle.com, clang-built-linux@...glegroups.com,
rostedt@...dmis.org, manir@...are.com, lauyiuch@...are.com,
pjonasson@...are.com, rajaramv@...are.com
Subject: Re: [PATCH 2/2] mm: rename memmap_init() and memmap_init_zone()
On 12/14/20 at 01:04pm, Mike Rapoport wrote:
> On Mon, Dec 14, 2020 at 11:00:07AM +0100, David Hildenbrand wrote:
> > On 13.12.20 16:09, Baoquan He wrote:
> > > The current memmap_init_zone() only handles memory region inside one zone.
> > > Actually memmap_init() does the memmap init of one zone. So rename both of
> > > them accordingly.
> > >
> > > And also rename the function parameter 'range_start_pfn' and local variable
> > > 'range_end_pfn' to zone_start_pfn/zone_end_pfn.
> > >
> > > Signed-off-by: Baoquan He <bhe@...hat.com>
> > > ---
......
> > > set_zone_contiguous(zone);
> > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > > index 315c22974f0d..fac599deba56 100644
> > > --- a/mm/page_alloc.c
> > > +++ b/mm/page_alloc.c
> > > @@ -6050,7 +6050,7 @@ overlap_memmap_init(unsigned long zone, unsigned long *pfn)
> > > * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related
> > > * zone stats (e.g., nr_isolate_pageblock) are touched.
> > > */
> > > -void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> > > +void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone,
> > > unsigned long start_pfn, unsigned long zone_end_pfn,
> > > enum meminit_context context,
> > > struct vmem_altmap *altmap, int migratetype)
> > > @@ -6187,21 +6187,21 @@ static void __meminit zone_init_free_lists(struct zone *zone)
> > > }
> > > }
> > >
> > > -void __meminit __weak memmap_init(unsigned long size, int nid,
> > > +void __meminit __weak memmap_init_zone(unsigned long size, int nid,
> > > unsigned long zone,
> > > - unsigned long range_start_pfn)
> > > + unsigned long zone_start_pfn)
> >
> > Why are we not simply passing "struct zone" like
> >
> > void __meminit __weak memmap_init_zone(struct zone *zone)
> >
> > from which we can derive
> > - nid
> > - zone idx
> > - zone_start_pfn
> > - spanned_pages / zone_end_pfn
> >
> > At least when called from free_area_init_core() this should work just
> > fine I think.
>
> There is also a custom memmap init in ia64 which at least should be
> tested ;-)
Right. Tried in arch/ia64/mm/init.c, the change is as below. Looks
simple, compiling passed on ia64 should be OK.
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index af678197ac2d..4fa49a762d58 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -541,12 +541,14 @@ virtual_memmap_init(u64 start, u64 end, void *arg)
return 0;
}
-void __meminit
-memmap_init_zone (unsigned long size, int nid, unsigned long zone,
- unsigned long start_pfn)
+void __meminit memmap_init_zone (struct zone *zone)
{
+ unsigned long size = zone->spanned_size;
+ int nid = zone_to_nid(zone), zone_id = zone_idx(zone);
+ unsigned long start_pfn = zone->zone_start_pfn;
+
if (!vmem_map) {
- memmap_init_range(size, nid, zone, start_pfn, start_pfn + size,
+ memmap_init_range(size, nid, zone_id, start_pfn, start_pfn + size,
MEMINIT_EARLY, NULL, MIGRATE_MOVABLE);
} else {
struct page *start;
@@ -556,7 +558,7 @@ memmap_init_zone (unsigned long size, int nid, unsigned long zone,
args.start = start;
args.end = start + size;
args.nid = nid;
- args.zone = zone;
+ args.zone = zone_id;
efi_memmap_walk(virtual_memmap_init, &args);
}
>
> More broadly, while Baoquan's fix looks Ok to me, I think we can
> calculate node->first_deferred_pfn earlier in, say,
> free_area_init_node() rather than do defer_init() check for each pfn.
Remember I ever tried to move the defer init up one level into memmap_init()
when making draft patch in the first place. I finally ended up with this
because there's overlap_memmap_init().
>
> > > {
> > > unsigned long start_pfn, end_pfn;
> > > - unsigned long range_end_pfn = range_start_pfn + size;
> > > + unsigned long zone_end_pfn = zone_start_pfn + size;
> > > int i;
> > >
> > > for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
> > > - start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
> > > - end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
> > > + start_pfn = clamp(start_pfn, zone_start_pfn, zone_end_pfn);
> > > + end_pfn = clamp(end_pfn, zone_start_pfn, zone_end_pfn);
> > >
> > > if (end_pfn > start_pfn) {
> > > size = end_pfn - start_pfn;
> > > - memmap_init_zone(size, nid, zone, start_pfn, range_end_pfn,
> > > + memmap_init_range(size, nid, zone, start_pfn, zone_end_pfn,
> > > MEMINIT_EARLY, NULL, MIGRATE_MOVABLE);
> > > }
> > > }
> > > @@ -6903,7 +6903,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
> > > set_pageblock_order();
> > > setup_usemap(pgdat, zone, zone_start_pfn, size);
> > > init_currently_empty_zone(zone, zone_start_pfn, size);
> > > - memmap_init(size, nid, j, zone_start_pfn);
> > > + memmap_init_zone(size, nid, j, zone_start_pfn);
> > > }
> > > }
> > >
> > >
> >
> >
> > --
> > Thanks,
> >
> > David / dhildenb
> >
>
> --
> Sincerely yours,
> Mike.
>
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