From: Alexander Duyck alexander.h.duyck@linux.intel.com
From: Alexander Duyck alexander.h.duyck@linux.intel.com
commit 56ec43d8b02719402c9fcf984feb52ec2300f8a5 upstream.
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.localdom... 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 Signed-off-by: Pavel Tatashin pasha.tatashin@soleen.com --- mm/page_alloc.c | 51 ++++++++++++++----------------------------------- 1 file changed, 14 insertions(+), 37 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d8c3051387d1..c86a117acb5b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1321,36 +1321,22 @@ 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
@@ -1480,21 +1466,13 @@ 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; }
@@ -1502,15 +1480,14 @@ 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)) { @@ -1530,17 +1507,18 @@ 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)) { @@ -1603,12 +1581,12 @@ 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);
@@ -1640,7 +1618,6 @@ 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); @@ -1690,7 +1667,7 @@ 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; } @@ -1702,7 +1679,7 @@ 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;