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Shutemov" Cc: Andrew Morton , Mel Gorman , Vlastimil Babka , David Hildenbrand , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv2] mm/page_alloc: Make deferred page init free pages in MAX_ORDER blocks Message-ID: References: <20230321002415.20843-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230321002415.20843-1-kirill.shutemov@linux.intel.com> X-Rspamd-Queue-Id: 06AFBA0003 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: usjwtk7q9e8mp68wiy3fp58u6d481fip X-HE-Tag: 1679466245-719119 X-HE-Meta: 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 TaF3D5WZ S5zORSQKb7cvYp3xDZeZQlQGn1UwNafKK5xp/0CwNkQyfmkHrxwhZDy5ZeKOFcGP2aBkx+1D5ARhaWwPaDUVCSKk4FRvcCTuAS8cW1zbN5fyNFkJUvmXkau26FSsvw2nivVJG2uM09gwU0+QhT+I6Xy0xrFYPCWRXzCtuZNbdeZ7i0vl2bGS9m2lvq37PD2jBkA6nQgxN5S+IwaWRDRxuK2GdB2viawNi3wrBQCNXVwi32jwq+toiMxcR0/vtEV+PIf7sbEDURpx3/yHq5pJTjwi0/kfZVvRMAzQFrg005pvg4DqrWCl14qoGbr3S7bqvK0M5mywZ5H9JCkVUW6cTRvEDKzXyNtP+ANWG+YNPatDZrKRqKtHDURUCV5M3A5BEzffNxEyZf/oai7r5jhN/yP32eiYM5QGPBVCCH1jC6DLqy2QsC2hXwracPg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Mar 21, 2023 at 03:24:15AM +0300, Kirill A. Shutemov wrote: > Normal page init path frees pages during the boot in MAX_ORDER chunks, > but deferred page init path does it in pageblock blocks. > > Change deferred page init path to work in MAX_ORDER blocks. > > For cases when MAX_ORDER is larger than pageblock, set migrate type to > MIGRATE_MOVABLE for all pageblocks covered by the page. > > Signed-off-by: Kirill A. Shutemov Acked-by: Mike Rapoport (IBM) > --- > > Note: the patch depends on the new definiton of MAX_ORDER. > > v2: > > - Fix commit message; > > --- > include/linux/mmzone.h | 2 ++ > mm/page_alloc.c | 19 ++++++++++--------- > 2 files changed, 12 insertions(+), 9 deletions(-) > > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h > index 96599cb9eb62..f53fe3a7ca45 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -32,6 +32,8 @@ > #endif > #define MAX_ORDER_NR_PAGES (1 << MAX_ORDER) > > +#define IS_MAX_ORDER_ALIGNED(pfn) IS_ALIGNED(pfn, MAX_ORDER_NR_PAGES) > + > /* > * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed > * costly to service. That is between allocation orders which should > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 87d760236dba..fc02a243425d 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1875,9 +1875,10 @@ static void __init deferred_free_range(unsigned long pfn, > page = pfn_to_page(pfn); > > /* Free a large naturally-aligned chunk if possible */ > - if (nr_pages == pageblock_nr_pages && pageblock_aligned(pfn)) { > - set_pageblock_migratetype(page, MIGRATE_MOVABLE); > - __free_pages_core(page, pageblock_order); > + if (nr_pages == MAX_ORDER_NR_PAGES && IS_MAX_ORDER_ALIGNED(pfn)) { > + for (i = 0; i < nr_pages; i += pageblock_nr_pages) > + set_pageblock_migratetype(page + i, MIGRATE_MOVABLE); > + __free_pages_core(page, MAX_ORDER); > return; > } > > @@ -1901,19 +1902,19 @@ static inline void __init pgdat_init_report_one_done(void) > /* > * Returns true if page needs to be initialized or freed to buddy allocator. > * > - * We check if a current large page is valid by only checking the validity > + * We check if a current MAX_ORDER block is valid by only checking the validity > * of the head pfn. > */ > static inline bool __init deferred_pfn_valid(unsigned long pfn) > { > - if (pageblock_aligned(pfn) && !pfn_valid(pfn)) > + if (IS_MAX_ORDER_ALIGNED(pfn) && !pfn_valid(pfn)) > return false; > return true; > } > > /* > * Free pages to buddy allocator. Try to free aligned pages in > - * pageblock_nr_pages sizes. > + * MAX_ORDER_NR_PAGES sizes. > */ > static void __init deferred_free_pages(unsigned long pfn, > unsigned long end_pfn) > @@ -1924,7 +1925,7 @@ static void __init deferred_free_pages(unsigned long pfn, > if (!deferred_pfn_valid(pfn)) { > deferred_free_range(pfn - nr_free, nr_free); > nr_free = 0; > - } else if (pageblock_aligned(pfn)) { > + } else if (IS_MAX_ORDER_ALIGNED(pfn)) { > deferred_free_range(pfn - nr_free, nr_free); > nr_free = 1; > } else { > @@ -1937,7 +1938,7 @@ static void __init deferred_free_pages(unsigned long pfn, > > /* > * Initialize struct pages. We minimize pfn page lookups and scheduler checks > - * by performing it only once every pageblock_nr_pages. > + * by performing it only once every MAX_ORDER_NR_PAGES. > * Return number of pages initialized. > */ > static unsigned long __init deferred_init_pages(struct zone *zone, > @@ -1953,7 +1954,7 @@ static unsigned long __init deferred_init_pages(struct zone *zone, > if (!deferred_pfn_valid(pfn)) { > page = NULL; > continue; > - } else if (!page || pageblock_aligned(pfn)) { > + } else if (!page || IS_MAX_ORDER_ALIGNED(pfn)) { > page = pfn_to_page(pfn); > } else { > page++; > -- > 2.39.2 > -- Sincerely yours, Mike.