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authorAlexander Duyck <alexander.h.duyck@linux.intel.com>2019-05-13 17:21:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-14 09:47:49 -0700
commit837566e7e08e3f89444166444836a8a49b9f9322 (patch)
tree189436a67634ff14180bba2925e1a8ef4fcda877 /mm/memblock.c
parent56ec43d8b02719402c9fcf984feb52ec2300f8a5 (diff)
downloadlinux-837566e7e08e3f89444166444836a8a49b9f9322.tar.bz2
mm: implement new zone specific memblock iterator
Introduce a new iterator for_each_free_mem_pfn_range_in_zone. This iterator will take care of making sure a given memory range provided is in fact contained within a zone. It takes are of all the bounds checking we were doing in deferred_grow_zone, and deferred_init_memmap. In addition it should help to speed up the search a bit by iterating until the end of a range is greater than the start of the zone pfn range, and will exit completely if the start is beyond the end of the zone. Link: http://lkml.kernel.org/r/20190405221225.12227.22573.stgit@localhost.localdomain Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Ingo Molnar <mingo@kernel.org> Cc: Khalid Aziz <khalid.aziz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Laurent Dufour <ldufour@linux.vnet.ibm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: <yi.z.zhang@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memblock.c')
-rw-r--r--mm/memblock.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index a48f520c2d01..f315eca9f4a1 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1255,6 +1255,70 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
return 0;
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+/**
+ * __next_mem_pfn_range_in_zone - iterator for for_each_*_range_in_zone()
+ *
+ * @idx: pointer to u64 loop variable
+ * @zone: zone in which all of the memory blocks reside
+ * @out_spfn: ptr to ulong for start pfn of the range, can be %NULL
+ * @out_epfn: ptr to ulong for end pfn of the range, can be %NULL
+ *
+ * This function is meant to be a zone/pfn specific wrapper for the
+ * for_each_mem_range type iterators. Specifically they are used in the
+ * deferred memory init routines and as such we were duplicating much of
+ * this logic throughout the code. So instead of having it in multiple
+ * locations it seemed like it would make more sense to centralize this to
+ * one new iterator that does everything they need.
+ */
+void __init_memblock
+__next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
+ unsigned long *out_spfn, unsigned long *out_epfn)
+{
+ int zone_nid = zone_to_nid(zone);
+ phys_addr_t spa, epa;
+ int nid;
+
+ __next_mem_range(idx, zone_nid, MEMBLOCK_NONE,
+ &memblock.memory, &memblock.reserved,
+ &spa, &epa, &nid);
+
+ while (*idx != U64_MAX) {
+ unsigned long epfn = PFN_DOWN(epa);
+ unsigned long spfn = PFN_UP(spa);
+
+ /*
+ * Verify the end is at least past the start of the zone and
+ * that we have at least one PFN to initialize.
+ */
+ if (zone->zone_start_pfn < epfn && spfn < epfn) {
+ /* if we went too far just stop searching */
+ if (zone_end_pfn(zone) <= spfn) {
+ *idx = U64_MAX;
+ break;
+ }
+
+ if (out_spfn)
+ *out_spfn = max(zone->zone_start_pfn, spfn);
+ if (out_epfn)
+ *out_epfn = min(zone_end_pfn(zone), epfn);
+
+ return;
+ }
+
+ __next_mem_range(idx, zone_nid, MEMBLOCK_NONE,
+ &memblock.memory, &memblock.reserved,
+ &spa, &epa, &nid);
+ }
+
+ /* signal end of iteration */
+ if (out_spfn)
+ *out_spfn = ULONG_MAX;
+ if (out_epfn)
+ *out_epfn = 0;
+}
+
+#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
/**
* memblock_alloc_range_nid - allocate boot memory block