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mm: drop meminit_pfn_in_nid as it is redundant 

As best as I can tell the meminit_pfn_in_nid call is completely redundant.
The deferred memory initialization is already making use of
for_each_free_mem_range which in turn will call into __next_mem_range
which will only return a memory range if it matches the node ID provided
assuming it is not NUMA_NO_NODE.

I am operating on the assumption that there are no zones or pgdata_t
structures that have a NUMA node of NUMA_NO_NODE associated with them.  If
that is the case then __next_mem_range will never return a memory range
that doesn't match the zone's node ID and as such the check is redundant.

So one piece I would like to verify on this is if this works for ia64.
Technically it was using a different approach to get the node ID, but it
seems to have the node ID also encoded into the memblock.  So I am
assuming this is okay, but would like to get confirmation on that.

On my x86_64 test system with 384GB of memory per node I saw a reduction
in initialization time from 2.80s to 1.85s as a result of this patch.

Link: http://lkml.kernel.org/r/20190405221219.12227.93957.stgit@localhost.localdomain
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: 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: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.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>
hifive-unleashed-5.2
Alexander Duyck 2019-05-13 17:21:13 -07:00 committed by Linus Torvalds
parent 5470dea49f
commit 56ec43d8b0
1 changed files with 14 additions and 37 deletions
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51
mm/page_alloc.c
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@ -1416,36 +1416,22 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
#endif
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
static inline bool __meminit __maybe_unused
meminit_pfn_in_nid(unsigned long pfn, int node,
struct mminit_pfnnid_cache *state)
/* Only safe to use early in boot when initialisation is single-threaded */
static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
{
int nid;
nid = __early_pfn_to_nid(pfn, state);
nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache);
if (nid >= 0 && nid != node)
return false;
return true;
}
/* Only safe to use early in boot when initialisation is single-threaded */
static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
{
return meminit_pfn_in_nid(pfn, node, &early_pfnnid_cache);
}
#else
static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
{
return true;
}
static inline bool __meminit __maybe_unused
meminit_pfn_in_nid(unsigned long pfn, int node,
struct mminit_pfnnid_cache *state)
{
return true;
}
#endif
@ -1574,21 +1560,13 @@ static inline void __init pgdat_init_report_one_done(void)
*
* Then, we check if a current large page is valid by only checking the validity
* of the head pfn.
*
* Finally, meminit_pfn_in_nid is checked on systems where pfns can interleave
* within a node: a pfn is between start and end of a node, but does not belong
* to this memory node.
*/
static inline bool __init
deferred_pfn_valid(int nid, unsigned long pfn,
struct mminit_pfnnid_cache *nid_init_state)
static inline bool __init deferred_pfn_valid(unsigned long pfn)
{
if (!pfn_valid_within(pfn))
return false;
if (!(pfn & (pageblock_nr_pages - 1)) && !pfn_valid(pfn))
return false;
if (!meminit_pfn_in_nid(pfn, nid, nid_init_state))
return false;
return true;
}
@ -1596,15 +1574,14 @@ deferred_pfn_valid(int nid, unsigned long pfn,
* Free pages to buddy allocator. Try to free aligned pages in
* pageblock_nr_pages sizes.
*/
static void __init deferred_free_pages(int nid, int zid, unsigned long pfn,
static void __init deferred_free_pages(unsigned long pfn,
unsigned long end_pfn)
{
struct mminit_pfnnid_cache nid_init_state = { };
unsigned long nr_pgmask = pageblock_nr_pages - 1;
unsigned long nr_free = 0;
for (; pfn < end_pfn; pfn++) {
if (!deferred_pfn_valid(nid, pfn, &nid_init_state)) {
if (!deferred_pfn_valid(pfn)) {
deferred_free_range(pfn - nr_free, nr_free);
nr_free = 0;
} else if (!(pfn & nr_pgmask)) {
@ -1624,17 +1601,18 @@ static void __init deferred_free_pages(int nid, int zid, unsigned long pfn,
* by performing it only once every pageblock_nr_pages.
* Return number of pages initialized.
*/
static unsigned long __init deferred_init_pages(int nid, int zid,
static unsigned long __init deferred_init_pages(struct zone *zone,
unsigned long pfn,
unsigned long end_pfn)
{
struct mminit_pfnnid_cache nid_init_state = { };
unsigned long nr_pgmask = pageblock_nr_pages - 1;
int nid = zone_to_nid(zone);
unsigned long nr_pages = 0;
int zid = zone_idx(zone);
struct page *page = NULL;
for (; pfn < end_pfn; pfn++) {
if (!deferred_pfn_valid(nid, pfn, &nid_init_state)) {
if (!deferred_pfn_valid(pfn)) {
page = NULL;
continue;
} else if (!page || !(pfn & nr_pgmask)) {
@ -1697,12 +1675,12 @@ static int __init deferred_init_memmap(void *data)
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));
nr_pages += deferred_init_pages(nid, zid, spfn, epfn);
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));
deferred_free_pages(nid, zid, spfn, epfn);
deferred_free_pages(spfn, epfn);
}
pgdat_resize_unlock(pgdat, &flags);
@ -1734,7 +1712,6 @@ static int __init deferred_init_memmap(void *data)
static noinline bool __init
deferred_grow_zone(struct zone *zone, unsigned int order)
{
int zid = zone_idx(zone);
int nid = zone_to_nid(zone);
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION);
@ -1784,7 +1761,7 @@ deferred_grow_zone(struct zone *zone, unsigned int order)
while (spfn < epfn && nr_pages < nr_pages_needed) {
t = ALIGN(spfn + PAGES_PER_SECTION, PAGES_PER_SECTION);
first_deferred_pfn = min(t, epfn);
nr_pages += deferred_init_pages(nid, zid, spfn,
nr_pages += deferred_init_pages(zone, spfn,
first_deferred_pfn);
spfn = first_deferred_pfn;
}
@ -1796,7 +1773,7 @@ deferred_grow_zone(struct zone *zone, unsigned int order)
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));
deferred_free_pages(nid, zid, spfn, epfn);
deferred_free_pages(spfn, epfn);
if (first_deferred_pfn == epfn)
break;