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Date: Wed, 20 Jan 2021 14:10:09 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Muchun Song <songmuchun@...edance.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>,
Xiongchun duan <duanxiongchun@...edance.com>,
Jonathan Corbet <corbet@....net>,
Thomas Gleixner <tglx@...utronix.de>, paulmck@...nel.org,
dave.hansen@...ux.intel.com, anshuman.khandual@....com,
oneukum@...e.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
Randy Dunlap <rdunlap@...radead.org>, mingo@...hat.com,
mchehab+huawei@...nel.org, luto@...nel.org,
Andrew Morton <akpm@...ux-foundation.org>,
viro@...iv.linux.org.uk, Peter Zijlstra <peterz@...radead.org>,
David Rientjes <rientjes@...gle.com>,
Michal Hocko <mhocko@...e.com>, jroedel@...e.de,
Mina Almasry <almasrymina@...gle.com>,
pawan.kumar.gupta@...ux.intel.com,
HORIGUCHI NAOYA(堀口 直也)
<naoya.horiguchi@....com>, David Hildenbrand <david@...hat.com>,
"Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v13 00/12] Free some vmemmap pages of HugeTLB page
On Wed, Jan 20, 2021 at 08:52:50PM +0800, Muchun Song wrote:
> Hi Oscar and Mike,
>
> Any suggestions about this version? Looking forward to your
> review. Thanks a lot.
Hi Muchun,
I plan to keep reviewing it in the coming days (tomorrow or Friday).
I glanced over patch#3 when you posted the series and nothing sticked out besides
what you have already pointed out, but I will have a further look.
thanks
>
> >
> > Changelog in v11 -> v12:
> > - Move VM_WARN_ON_PAGE to a separate patch.
> > - Call __free_hugepage() with hugetlb_lock (See patch #5.) to serialize
> > with dissolve_free_huge_page(). It is to prepare for patch #9.
> > - Introduce PageHugeInflight. See patch #9.
> >
> > Changelog in v10 -> v11:
> > - Fix compiler error when !CONFIG_HUGETLB_PAGE_FREE_VMEMMAP.
> > - Rework some comments and commit changes.
> > - Rework vmemmap_remap_free() to 3 parameters.
> >
> > Thanks to Oscar and Mike's suggestions and review.
> >
> > Changelog in v9 -> v10:
> > - Fix a bug in patch #11. Thanks to Oscar for pointing that out.
> > - Rework some commit log or comments. Thanks Mike and Oscar for the suggestions.
> > - Drop VMEMMAP_TAIL_PAGE_REUSE in the patch #3.
> >
> > Thank you very much Mike and Oscar for reviewing the code.
> >
> > Changelog in v8 -> v9:
> > - Rework some code. Very thanks to Oscar.
> > - Put all the non-hugetlb vmemmap functions under sparsemem-vmemmap.c.
> >
> > Changelog in v7 -> v8:
> > - Adjust the order of patches.
> >
> > Very thanks to David and Oscar. Your suggestions are very valuable.
> >
> > Changelog in v6 -> v7:
> > - Rebase to linux-next 20201130
> > - Do not use basepage mapping for vmemmap when this feature is disabled.
> > - Rework some patchs.
> > [PATCH v6 08/16] mm/hugetlb: Free the vmemmap pages associated with each hugetlb page
> > [PATCH v6 10/16] mm/hugetlb: Allocate the vmemmap pages associated with each hugetlb page
> >
> > Thanks to Oscar and Barry.
> >
> > Changelog in v5 -> v6:
> > - Disable PMD/huge page mapping of vmemmap if this feature was enabled.
> > - Simplify the first version code.
> >
> > Changelog in v4 -> v5:
> > - Rework somme comments and code in the [PATCH v4 04/21] and [PATCH v4 05/21].
> >
> > Thanks to Mike and Oscar's suggestions.
> >
> > Changelog in v3 -> v4:
> > - Move all the vmemmap functions to hugetlb_vmemmap.c.
> > - Make the CONFIG_HUGETLB_PAGE_FREE_VMEMMAP default to y, if we want to
> > disable this feature, we should disable it by a boot/kernel command line.
> > - Remove vmemmap_pgtable_{init, deposit, withdraw}() helper functions.
> > - Initialize page table lock for vmemmap through core_initcall mechanism.
> >
> > Thanks for Mike and Oscar's suggestions.
> >
> > Changelog in v2 -> v3:
> > - Rename some helps function name. Thanks Mike.
> > - Rework some code. Thanks Mike and Oscar.
> > - Remap the tail vmemmap page with PAGE_KERNEL_RO instead of PAGE_KERNEL.
> > Thanks Matthew.
> > - Add some overhead analysis in the cover letter.
> > - Use vmemap pmd table lock instead of a hugetlb specific global lock.
> >
> > Changelog in v1 -> v2:
> > - Fix do not call dissolve_compound_page in alloc_huge_page_vmemmap().
> > - Fix some typo and code style problems.
> > - Remove unused handle_vmemmap_fault().
> > - Merge some commits to one commit suggested by Mike.
> >
> > Muchun Song (12):
> > mm: memory_hotplug: factor out bootmem core functions to
> > bootmem_info.c
> > mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP
> > mm: hugetlb: free the vmemmap pages associated with each HugeTLB page
> > mm: hugetlb: defer freeing of HugeTLB pages
> > mm: hugetlb: allocate the vmemmap pages associated with each HugeTLB
> > page
> > mm: hugetlb: set the PageHWPoison to the raw error page
> > mm: hugetlb: flush work when dissolving a HugeTLB page
> > mm: hugetlb: introduce PageHugeInflight
> > mm: hugetlb: add a kernel parameter hugetlb_free_vmemmap
> > mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate
> > mm: hugetlb: gather discrete indexes of tail page
> > mm: hugetlb: optimize the code with the help of the compiler
> >
> > Documentation/admin-guide/kernel-parameters.txt | 14 ++
> > Documentation/admin-guide/mm/hugetlbpage.rst | 3 +
> > arch/x86/mm/init_64.c | 13 +-
> > fs/Kconfig | 18 ++
> > include/linux/bootmem_info.h | 65 ++++++
> > include/linux/hugetlb.h | 37 ++++
> > include/linux/hugetlb_cgroup.h | 15 +-
> > include/linux/memory_hotplug.h | 27 ---
> > include/linux/mm.h | 5 +
> > mm/Makefile | 2 +
> > mm/bootmem_info.c | 124 +++++++++++
> > mm/hugetlb.c | 218 +++++++++++++++++--
> > mm/hugetlb_vmemmap.c | 278 ++++++++++++++++++++++++
> > mm/hugetlb_vmemmap.h | 45 ++++
> > mm/memory_hotplug.c | 116 ----------
> > mm/sparse-vmemmap.c | 273 +++++++++++++++++++++++
> > mm/sparse.c | 1 +
> > 17 files changed, 1082 insertions(+), 172 deletions(-)
> > create mode 100644 include/linux/bootmem_info.h
> > create mode 100644 mm/bootmem_info.c
> > create mode 100644 mm/hugetlb_vmemmap.c
> > create mode 100644 mm/hugetlb_vmemmap.h
> >
> > --
> > 2.11.0
> >
>
--
Oscar Salvador
SUSE L3
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