From: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Subject: mm: calculate deferred pages after skipping mirrored memory update_defer_init() should be called only when struct page is about to be initialized. Because it counts number of initialized struct pages, but there we may skip struct pages if there is some mirrored memory. So move, update_defer_init() after checking for mirrored memory. Also, rename update_defer_init() to defer_init() and reverse the return boolean to emphasize that this is a boolean function, that tells that the reset of memmap initialization should be deferred. Make this function self-contained: do not pass number of already initialized pages in this zone by using static counters. I found this bug by reading the code. The effect is that fewer than expected struct pages are initialized early in boot, and it is possible that in some corner cases we may fail to boot when mirrored pages are used. The deferred on demand code should somewhat mitigate this. But this still brings some inconsistencies compared to when booting without mirrored pages, so it is better to fix. [pasha.tatashin@xxxxxxxxxx: add comment about defer_init's lack of locking] Link: http://lkml.kernel.org/r/20180726193509.3326-3-pasha.tatashin@xxxxxxxxxx [akpm@xxxxxxxxxxxxxxxxxxxx: make defer_init non-inline, __meminit] Link: http://lkml.kernel.org/r/20180724235520.10200-3-pasha.tatashin@xxxxxxxxxx Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Reviewed-by: Oscar Salvador <osalvador@xxxxxxx> Cc: Abdul Haleem <abdhalee@xxxxxxxxxxxxxxxxxx> Cc: Baoquan He <bhe@xxxxxxxxxx> Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jan Kara <jack@xxxxxxx> Cc: Jérôme Glisse <jglisse@xxxxxxxxxx> Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx> Cc: Steven Sistare <steven.sistare@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Wei Yang <richard.weiyang@xxxxxxxxx> Cc: Pasha Tatashin <Pavel.Tatashin@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 45 +++++++++++++++++++++++++-------------------- 1 file changed, 25 insertions(+), 20 deletions(-) --- a/mm/page_alloc.c~mm-calculate-deferred-pages-after-skipping-mirrored-memory +++ a/mm/page_alloc.c @@ -307,24 +307,33 @@ static inline bool __meminit early_page_ } /* - * Returns false when the remaining initialisation should be deferred until + * Returns true when the remaining initialisation should be deferred until * later in the boot cycle when it can be parallelised. */ -static inline bool update_defer_init(pg_data_t *pgdat, - unsigned long pfn, unsigned long zone_end, - unsigned long *nr_initialised) +static bool __meminit +defer_init(int nid, unsigned long pfn, unsigned long end_pfn) { + static unsigned long prev_end_pfn, nr_initialised; + + /* + * prev_end_pfn static that contains the end of previous zone + * No need to protect because called very early in boot before smp_init. + */ + if (prev_end_pfn != end_pfn) { + prev_end_pfn = end_pfn; + nr_initialised = 0; + } + /* Always populate low zones for address-constrained allocations */ - if (zone_end < pgdat_end_pfn(pgdat)) - return true; - (*nr_initialised)++; - if ((*nr_initialised > pgdat->static_init_pgcnt) && - (pfn & (PAGES_PER_SECTION - 1)) == 0) { - pgdat->first_deferred_pfn = pfn; + if (end_pfn < pgdat_end_pfn(NODE_DATA(nid))) return false; + nr_initialised++; + if ((nr_initialised > NODE_DATA(nid)->static_init_pgcnt) && + (pfn & (PAGES_PER_SECTION - 1)) == 0) { + NODE_DATA(nid)->first_deferred_pfn = pfn; + return true; } - - return true; + return false; } #else static inline bool early_page_uninitialised(unsigned long pfn) @@ -332,11 +341,9 @@ static inline bool early_page_uninitiali return false; } -static inline bool update_defer_init(pg_data_t *pgdat, - unsigned long pfn, unsigned long zone_end, - unsigned long *nr_initialised) +static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn) { - return true; + return false; } #endif @@ -5453,9 +5460,7 @@ void __meminit memmap_init_zone(unsigned struct vmem_altmap *altmap) { unsigned long end_pfn = start_pfn + size; - pg_data_t *pgdat = NODE_DATA(nid); unsigned long pfn; - unsigned long nr_initialised = 0; struct page *page; #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP struct memblock_region *r = NULL, *tmp; @@ -5497,8 +5502,6 @@ void __meminit memmap_init_zone(unsigned if (!early_pfn_in_nid(pfn, nid)) continue; - if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised)) - break; #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP /* @@ -5521,6 +5524,8 @@ void __meminit memmap_init_zone(unsigned } } #endif + if (defer_init(nid, pfn, end_pfn)) + break; not_early: page = pfn_to_page(pfn); _
