From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id C3AA32119623D for ; Fri, 30 Nov 2018 13:52:48 -0800 (PST) Subject: [mm PATCH v6 0/7] Deferred page init improvements From: Alexander Duyck Date: Fri, 30 Nov 2018 13:52:48 -0800 Message-ID: <154361452447.7497.1348692079883153517.stgit@ahduyck-desk1.amr.corp.intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: akpm@linux-foundation.org, linux-mm@kvack.org Cc: pavel.tatashin@microsoft.com, mhocko@suse.com, linux-nvdimm@lists.01.org, alexander.h.duyck@linux.intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mingo@kernel.org, khalid.aziz@oracle.com, rppt@linux.vnet.ibm.com, vbabka@suse.cz, sparclinux@vger.kernel.org, ldufour@linux.vnet.ibm.com, mgorman@techsingularity.net, davem@davemloft.net, kirill.shutemov@linux.intel.com List-ID: This patchset is essentially a refactor of the page initialization logic that is meant to provide for better code reuse while providing a significant improvement in deferred page initialization performance. In my testing on an x86_64 system with 384GB of RAM and 3TB of persistent memory per node I have seen the following. In the case of regular memory initialization the deferred init time was decreased from 3.75s to 1.06s on average. For the persistent memory the initialization time dropped from 24.17s to 19.12s on average. This amounts to a 253% improvement for the deferred memory initialization performance, and a 26% improvement in the persistent memory initialization performance. I have called out the improvement observed with each patch. Note: This patch set is meant as a replacment for the v5 set that is already in the MM tree. I had considered just doing incremental changes but Pavel at the time had suggested I submit it as a whole set, however that was almost 3 weeks ago so if incremental changes are preferred let me know and I can submit the changes as incremental updates. I appologize for the delay in submitting this follow-on set. I had been trying to address the DAX PageReserved bit issue at the same time but that is taking more time than I anticipated so I decided to push this before the code sits too much longer. Commit bf416078f1d83 ("mm/page_alloc.c: memory hotplug: free pages as higher order") causes issues with the revert of patch 7. It was necessary to replace all instances of __free_pages_boot_core with __free_pages_core. v1->v2: Fixed build issue on PowerPC due to page struct size being 56 Added new patch that removed __SetPageReserved call for hotplug v2->v3: Rebased on latest linux-next Removed patch that had removed __SetPageReserved call from init Added patch that folded __SetPageReserved into set_page_links Tweaked __init_pageblock to use start_pfn to get section_nr instead of pfn v3->v4: Updated patch description and comments for mm_zero_struct_page patch Replaced "default" with "case 64" Removed #ifndef mm_zero_struct_page Fixed typo in comment that ommited "_from" in kerneldoc for iterator Added Reviewed-by for patches reviewed by Pavel Added Acked-by from Michal Hocko Added deferred init times for patches that affect init performance Swapped patches 5 & 6, pulled some code/comments from 4 into 5 v4->v5: Updated Acks/Reviewed-by Rebased on latest linux-next Split core bits of zone iterator patch from MAX_ORDER_NR_PAGES init v5->v6: Rebased on linux-next with previous v5 reverted Drop the "This patch" or "This change" from patch desriptions. Cleaned up patch descriptions for patches 3 & 4 Fixed kerneldoc for __next_mem_pfn_range_in_zone Updated several Reviewed-by, and incorporated suggestions from Pavel Added __init_single_page_nolru to patch 5 to consolidate code Refactored iterator in patch 7 and fixed several issues --- Alexander Duyck (7): mm: Use mm_zero_struct_page from SPARC on all 64b architectures mm: Drop meminit_pfn_in_nid as it is redundant mm: Implement new zone specific memblock iterator mm: Initialize MAX_ORDER_NR_PAGES at a time instead of doing larger sections mm: Move hot-plug specific memory init into separate functions and optimize mm: Add reserved flag setting to set_page_links mm: Use common iterator for deferred_init_pages and deferred_free_pages arch/sparc/include/asm/pgtable_64.h | 30 -- include/linux/memblock.h | 41 +++ include/linux/mm.h | 50 +++ mm/memblock.c | 64 ++++ mm/page_alloc.c | 571 +++++++++++++++++++++-------------- 5 files changed, 498 insertions(+), 258 deletions(-) -- _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm