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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>
This commit is contained in:
Alexander Duyck 2019-05-13 17:21:17 -07:00 committed by Linus Torvalds
parent 56ec43d8b0
commit 837566e7e0
3 changed files with 101 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
include/linux/memblock.h
View File

@ -240,6 +240,31 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
unsigned long *out_spfn,
unsigned long *out_epfn);
/**
* for_each_free_mem_range_in_zone - iterate through zone specific free
* memblock areas
* @i: u64 used as loop variable
* @zone: zone in which all of the memory blocks reside
* @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
* @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
*
* Walks over free (memory && !reserved) areas of memblock in a specific
* zone. Available once memblock and an empty zone is initialized. The main
* assumption is that the zone start, end, and pgdat have been associated.
* This way we can use the zone to determine NUMA node, and if a given part
* of the memblock is valid for the zone.
*/
#define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end) \
for (i = 0, \
__next_mem_pfn_range_in_zone(&i, zone, p_start, p_end); \
i != U64_MAX; \
__next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
/**
* for_each_free_mem_range - iterate through free memblock areas
* @i: u64 used as loop variable

64
mm/memblock.c
View File

@ -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

31
mm/page_alloc.c
View File

@ -1631,11 +1631,9 @@ static unsigned long __init deferred_init_pages(struct zone *zone,
static int __init deferred_init_memmap(void *data)
{
pg_data_t *pgdat = data;
int nid = pgdat->node_id;
unsigned long start = jiffies;
unsigned long nr_pages = 0;
unsigned long spfn, epfn, first_init_pfn, flags;
phys_addr_t spa, epa;
int zid;
struct zone *zone;
const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
@ -1672,14 +1670,12 @@ static int __init deferred_init_memmap(void *data)
* freeing pages we can access pages that are ahead (computing buddy
* page in __free_one_page()).
*/
for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa));
for_each_free_mem_pfn_range_in_zone(i, zone, &spfn, &epfn) {
spfn = max_t(unsigned long, first_init_pfn, spfn);
nr_pages += deferred_init_pages(zone, spfn, epfn);
}
for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa));
for_each_free_mem_pfn_range_in_zone(i, zone, &spfn, &epfn) {
spfn = max_t(unsigned long, first_init_pfn, spfn);
deferred_free_pages(spfn, epfn);
}
pgdat_resize_unlock(pgdat, &flags);
@ -1687,8 +1683,8 @@ static int __init deferred_init_memmap(void *data)
/* Sanity check that the next zone really is unpopulated */
WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone));
pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_pages,
jiffies_to_msecs(jiffies - start));
pr_info("node %d initialised, %lu pages in %ums\n",
pgdat->node_id, nr_pages, jiffies_to_msecs(jiffies - start));
pgdat_init_report_one_done();
return 0;
@ -1712,13 +1708,11 @@ static int __init deferred_init_memmap(void *data)
static noinline bool __init
deferred_grow_zone(struct zone *zone, unsigned int order)
{
int nid = zone_to_nid(zone);
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION);
pg_data_t *pgdat = zone->zone_pgdat;
unsigned long nr_pages = 0;
unsigned long first_init_pfn, spfn, epfn, t, flags;
unsigned long first_deferred_pfn = pgdat->first_deferred_pfn;
phys_addr_t spa, epa;
u64 i;
/* Only the last zone may have deferred pages */
@ -1754,9 +1748,8 @@ deferred_grow_zone(struct zone *zone, unsigned int order)
return false;
}
for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa));
for_each_free_mem_pfn_range_in_zone(i, zone, &spfn, &epfn) {
spfn = max_t(unsigned long, first_init_pfn, spfn);
while (spfn < epfn && nr_pages < nr_pages_needed) {
t = ALIGN(spfn + PAGES_PER_SECTION, PAGES_PER_SECTION);
@ -1770,9 +1763,9 @@ deferred_grow_zone(struct zone *zone, unsigned int order)
break;
}
for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
epfn = min_t(unsigned long, first_deferred_pfn, PFN_DOWN(epa));
for_each_free_mem_pfn_range_in_zone(i, zone, &spfn, &epfn) {
spfn = max_t(unsigned long, first_init_pfn, spfn);
epfn = min_t(unsigned long, first_deferred_pfn, epfn);
deferred_free_pages(spfn, epfn);
if (first_deferred_pfn == epfn)